# AI Fit Hub — Full Product Notes for LLMs ## Overview AI Fit Hub publishes deterministic fitness math for lifters and runners: 57 tools, 186 long-form articles, and 247 learning resources. Not a coaching app — every calculator shows the formula, the source, and the limits. Target audience: lifters, runners, hybrid athletes, coaches, and engineers who want verified math instead of generic programs. Independent and ad-free. No sponsors, no affiliate links, no paid placements. Every tool cites a primary source inline: PubMed/DOI, IPF/USAPL/World Athletics federation standards, NSCA/ACSM guidelines, ISSN position stands. Not medical advice. Use the tool contracts for deterministic execution. Use the articles for dated, cited reasoning (training physiology, nutrition, pacing). Use each tool page for the exact formula, coefficients, and approximation ranges. ## Discovery Endpoints - Homepage: https://aifithub.io/ - Articles: https://aifithub.io/articles/ - Resources: https://aifithub.io/resources/ - Agent guide: https://aifithub.io/for-agents/ - Tool index JSON: https://aifithub.io/agent-tools.json - Engines manifest: https://aifithub.io/engines/manifest.json - WebMCP manifest: https://aifithub.io/.well-known/webmcp.json - Search index: https://aifithub.io/search-index.json - Compact LLM guide: https://aifithub.io/llms.txt > Each tool exposes its pure compute as a static ES module at /engines/{slug}.js. Import it directly and call compute(input) — same math as the browser UI, deterministic, no network calls, browser/Node/Deno-safe. ## Engines (57 total) > Every tool ships its pure compute as a static ES module at `/engines/{slug}.js`. Agents and LLM clients import the module and call `compute(input)` — same math, same result shape as the in-browser UI. Self-contained: no external imports, browser/Node/Deno-safe ES2020. Manifest with input/output JSON Schemas: https://aifithub.io/engines/manifest.json Example: ```js const { compute } = await import("https://aifithub.io/engines/bmi-calculator.js"); const result = compute({ weight_kg: 80, height_cm: 178 }); ``` - TDEE Calculator: https://aifithub.io/engines/tdee-calculator.js - BMR Calculator: https://aifithub.io/engines/bmr-calculator.js - Macro Calculator: https://aifithub.io/engines/macro-calculator.js - BMI Calculator: https://aifithub.io/engines/bmi-calculator.js - Calorie Deficit Calculator: https://aifithub.io/engines/calorie-deficit-calculator.js - Body Recomposition Planner: https://aifithub.io/engines/body-recomposition-planner.js - Progressive Overload Planner: https://aifithub.io/engines/progressive-overload-planner.js - One-Rep Max Calculator: https://aifithub.io/engines/one-rep-max-calculator.js - Body Fat Percentage Calculator: https://aifithub.io/engines/body-fat-percentage-calculator.js - Protein Intake Calculator: https://aifithub.io/engines/protein-intake-calculator.js - Ideal Weight Calculator: https://aifithub.io/engines/ideal-weight-calculator.js - Running Pace Calculator: https://aifithub.io/engines/running-pace-calculator.js - Heart Rate Zone Calculator: https://aifithub.io/engines/heart-rate-zone-calculator.js - Water Intake Calculator: https://aifithub.io/engines/water-intake-calculator.js - Waist-to-Hip Ratio Calculator: https://aifithub.io/engines/waist-to-hip-ratio-calculator.js - Sleep Calculator: https://aifithub.io/engines/sleep-calculator.js - FFMI Calculator: https://aifithub.io/engines/ffmi-calculator.js - VO2 Max Estimator: https://aifithub.io/engines/vo2-max-estimator.js - Strength Standards Calculator: https://aifithub.io/engines/strength-standards-calculator.js - DOTS & Wilks Score Calculator: https://aifithub.io/engines/dots-score-calculator.js - Lean Body Mass Calculator: https://aifithub.io/engines/lean-body-mass-calculator.js - Walking Calorie Calculator: https://aifithub.io/engines/walking-calorie-calculator.js - Calories Burned Calculator: https://aifithub.io/engines/calories-burned-calculator.js - Intermittent Fasting Window Planner: https://aifithub.io/engines/intermittent-fasting-window-planner.js - Creatine Intake Calculator: https://aifithub.io/engines/creatine-intake-calculator.js - Workout Volume Calculator: https://aifithub.io/engines/workout-volume-calculator.js - Food-to-Exercise Converter: https://aifithub.io/engines/food-to-exercise-converter.js - Resting Heart Rate Calculator: https://aifithub.io/engines/resting-heart-rate-calculator.js - Flexibility Score Calculator: https://aifithub.io/engines/flexibility-score-calculator.js - Swim Pace Calculator: https://aifithub.io/engines/swim-pace-calculator.js - Run Training Paces Calculator: https://aifithub.io/engines/run-training-paces-calculator.js - Sweat Rate Calculator: https://aifithub.io/engines/sweat-rate-calculator.js - Race Time Predictor: https://aifithub.io/engines/race-time-predictor.js - Cycling Power & FTP Zone Calculator: https://aifithub.io/engines/cycling-power-ftp-zone-calculator.js - Plate Loading Calculator: https://aifithub.io/engines/plate-loading-calculator.js - Treadmill Pace Converter: https://aifithub.io/engines/treadmill-pace-converter.js - Zone 2 Heart Rate Calculator: https://aifithub.io/engines/zone-2-heart-rate-calculator.js - DOTS vs Wilks vs GL Calculator: https://aifithub.io/engines/dots-wilks-gl-combined-calculator.js - RPE to Percentage Converter: https://aifithub.io/engines/rpe-to-percentage-converter.js - Strength Percentile Calculator: https://aifithub.io/engines/strength-percentile-calculator.js - Meet Day Attempt Selector: https://aifithub.io/engines/meet-day-attempt-selector.js - Hybrid Training Planner: https://aifithub.io/engines/hybrid-training-planner.js - Sleep Debt Calculator: https://aifithub.io/engines/sleep-debt-calculator.js - Macro Cycling Calculator: https://aifithub.io/engines/macro-cycling-calculator.js - Muscle Gain Potential Calculator: https://aifithub.io/engines/muscle-gain-potential-calculator.js - Wendler 5/3/1 Planner: https://aifithub.io/engines/wendler-531-planner.js - Smolov / Sheiko / Texas Method Cycles: https://aifithub.io/engines/smolov-sheiko-texas-cycles.js - Velocity-Based 1RM Estimator: https://aifithub.io/engines/velocity-based-1rm.js - Concurrent Training Interference Estimator: https://aifithub.io/engines/concurrent-training-interference.js - Detraining Decay Estimator: https://aifithub.io/engines/detraining-decay.js - Junk Volume Detector: https://aifithub.io/engines/junk-volume-detector.js - Marathon Pace + Elevation Calculator: https://aifithub.io/engines/marathon-pace-elevation.js - Sweat-Rate + Electrolyte Marathon Plan: https://aifithub.io/engines/sweat-rate-electrolyte-marathon.js - Race-Week Taper Planner: https://aifithub.io/engines/race-week-taper.js - Female Athlete Formula Suite: https://aifithub.io/engines/female-athlete-formula-suite.js - HRV Deload Trigger: https://aifithub.io/engines/hrv-deload-trigger.js - Hybrid Athlete Macro Split: https://aifithub.io/engines/hybrid-athlete-macro-split.js ## Reference data (7 tables) > Parameter sweeps of deterministic engines across full input grids. Every cell is live /engines/{slug}.js output, recomputed at build, downloadable as CSV, free to cite (CC BY 4.0). - Index: https://aifithub.io/reference/ - BMI chart by height and weight for adults (320-cell grid, imperial and metric): https://aifithub.io/reference/bmi-chart-by-height-and-weight/ CSV download: in-page data: URI, 320 rows (columns: units, height_in, height_cm, weight_lb, weight_kg, bmi, cdc_category) Engine: https://aifithub.io/engines/bmi-calculator.js - Squat strength percentile by bodyweight and lift (56-cell grid, male): https://aifithub.io/reference/strength-percentile-by-bodyweight-and-lift/ CSV download: in-page data: URI, 56 rows (columns: bodyweight_kg, lift, weight_lifted_kg, sex, reps, estimated_1rm_kg, bw_ratio, level, percentile) Engine: https://aifithub.io/engines/strength-percentile-calculator.js - One-rep max by reps and weight lifted (48-cell grid): https://aifithub.io/reference/one-rep-max-by-reps-and-weight/ CSV download: in-page data: URI, 48 rows (columns: reps, weight_lifted_kg, epley_kg, brzycki_kg, lombardi_kg, mayhew_kg, wathen_kg, lander_kg, average_1rm_kg, training_max_90_kg, training_max_85_kg) Engine: https://aifithub.io/engines/one-rep-max-calculator.js - FFMI by bodyweight and body-fat percentage (42-cell grid, 180 cm): https://aifithub.io/reference/ffmi-by-bodyweight-and-body-fat/ CSV download: in-page data: URI, 42 rows (columns: bodyweight_kg, height_cm, body_fat_pct, ffmi, adjusted_ffmi, fat_free_mass_kg, interpretation) Engine: https://aifithub.io/engines/ffmi-calculator.js - TDEE by bodyweight and activity level (35-cell grid, 35y male, 178 cm): https://aifithub.io/reference/tdee-by-bodyweight-and-activity-level/ CSV download: in-page data: URI, 35 rows (columns: bodyweight_kg, activity_level, activity_factor, sex, age, height_cm, bmr_kcal, tdee_kcal) Engine: https://aifithub.io/engines/tdee-calculator.js - Body fat by waist and neck circumference (42-cell grid, U.S. Navy, male, 180 cm): https://aifithub.io/reference/body-fat-by-waist-and-neck/ CSV download: in-page data: URI, 42 rows (columns: waist_cm, neck_cm, sex, height_cm, body_fat_pct, category) Engine: https://aifithub.io/engines/body-fat-percentage-calculator.js - Macros by calories and bodyweight (42-cell grid): https://aifithub.io/reference/macros-by-calories-and-bodyweight/ CSV download: in-page data: URI, 42 rows (columns: calories_kcal, bodyweight_kg, protein_g, carb_g, fat_g) Engine: https://aifithub.io/engines/macro-calculator.js ## Benchmarks (1 table) > Controlled comparisons computed live from deterministic engines, recomputed at build, downloadable as CSV, free to cite (CC BY 4.0). These compare engine outputs, not vendor marketing claims. - Index: https://aifithub.io/benchmarks/ - 2026 one-rep-max formula disagreement benchmark (48-cell grid: 8 rep counts × 6 formulas, fixed 100 kg lift): https://aifithub.io/benchmarks/one-rep-max-formula-disagreement/ CSV download: in-page data: URI, 8 rows (columns: reps, weight_lifted_kg, epley_1rm_kg, brzycki_1rm_kg, lombardi_1rm_kg, mayhew_1rm_kg, wathen_1rm_kg, lander_1rm_kg, average_1rm_kg, spread_kg, spread_pct) Engine: https://aifithub.io/engines/one-rep-max-calculator.js ## Tools (57 total) ### TDEE Calculator - URL: https://aifithub.io/tdee-calculator/ - Category: Nutrition - Summary: Estimate your daily energy expenditure with Mifflin-St Jeor + activity factors. - Contract: https://aifithub.io/contracts/tdee-calculator.json - Engine module: https://aifithub.io/engines/tdee-calculator.js ### BMR Calculator - URL: https://aifithub.io/bmr-calculator/ - Category: Nutrition - Summary: Estimate basal metabolic rate and maintenance calories using Mifflin-St Jeor assumptions. - Contract: https://aifithub.io/contracts/bmr-calculator.json - Engine module: https://aifithub.io/engines/bmr-calculator.js ### Macro Calculator - URL: https://aifithub.io/macro-calculator/ - Category: Nutrition - Summary: Convert calorie targets into protein, carbs, and fat grams for your goal. - Contract: https://aifithub.io/contracts/macro-calculator.json - Engine module: https://aifithub.io/engines/macro-calculator.js ### BMI Calculator - URL: https://aifithub.io/bmi-calculator/ - Category: Body Composition - Summary: Calculate BMI quickly with a plain-language range explanation and limitations. - Contract: https://aifithub.io/contracts/bmi-calculator.json - Engine module: https://aifithub.io/engines/bmi-calculator.js ### Calorie Deficit Calculator - URL: https://aifithub.io/calorie-deficit-calculator/ - Category: Planning - Summary: Estimate required daily calorie deficit for a target timeline and bodyweight change. - Contract: https://aifithub.io/contracts/calorie-deficit-calculator.json - Engine module: https://aifithub.io/engines/calorie-deficit-calculator.js ### Body Recomposition Planner - URL: https://aifithub.io/body-recomposition-planner/ - Category: Planning - Summary: Plan body-fat reduction pace, deficit targets, and protein needs around a timeline. - Contract: https://aifithub.io/contracts/body-recomposition-planner.json - Engine module: https://aifithub.io/engines/body-recomposition-planner.js ### Progressive Overload Planner - URL: https://aifithub.io/progressive-overload-planner/ - Category: Strength - Summary: Project lifting progression with weekly overload and planned deload cycles. - Contract: https://aifithub.io/contracts/progressive-overload-planner.json - Engine module: https://aifithub.io/engines/progressive-overload-planner.js ### One-Rep Max Calculator - URL: https://aifithub.io/one-rep-max-calculator/ - Category: Strength - Summary: Estimate one-rep max with Epley, Brzycki, and Lombardi formulas. - Contract: https://aifithub.io/contracts/one-rep-max-calculator.json - Engine module: https://aifithub.io/engines/one-rep-max-calculator.js ### Body Fat Percentage Calculator - URL: https://aifithub.io/body-fat-percentage-calculator/ - Category: Body Composition - Summary: Estimate body fat percentage using the U.S. Navy circumference method. - Contract: https://aifithub.io/contracts/body-fat-percentage-calculator.json - Engine module: https://aifithub.io/engines/body-fat-percentage-calculator.js ### Protein Intake Calculator - URL: https://aifithub.io/protein-intake-calculator/ - Category: Nutrition - Summary: Get daily protein targets based on training level and goal. - Contract: https://aifithub.io/contracts/protein-intake-calculator.json - Engine module: https://aifithub.io/engines/protein-intake-calculator.js ### Ideal Weight Calculator - URL: https://aifithub.io/ideal-weight-calculator/ - Category: Body Composition - Summary: Compare Devine, Robinson, Miller, and Hamwi formulas as a realistic range. - Contract: https://aifithub.io/contracts/ideal-weight-calculator.json - Engine module: https://aifithub.io/engines/ideal-weight-calculator.js ### Running Pace Calculator - URL: https://aifithub.io/running-pace-calculator/ - Category: Cardio - Summary: Calculate pace per km and mile and project race finish times from one run. - Contract: https://aifithub.io/contracts/running-pace-calculator.json - Engine module: https://aifithub.io/engines/running-pace-calculator.js ### Heart Rate Zone Calculator - URL: https://aifithub.io/heart-rate-zone-calculator/ - Category: Recovery - Summary: Calculate personalized training zones with the Karvonen method. - Contract: https://aifithub.io/contracts/heart-rate-zone-calculator.json - Engine module: https://aifithub.io/engines/heart-rate-zone-calculator.js ### Water Intake Calculator - URL: https://aifithub.io/water-intake-calculator/ - Category: Nutrition - Summary: Calculate daily water intake based on weight, activity level, and climate. - Contract: https://aifithub.io/contracts/water-intake-calculator.json - Engine module: https://aifithub.io/engines/water-intake-calculator.js ### Waist-to-Hip Ratio Calculator - URL: https://aifithub.io/waist-to-hip-ratio-calculator/ - Category: Body Composition - Summary: Calculate waist-to-hip ratio and assess body composition using WHO guidelines. - Contract: https://aifithub.io/contracts/waist-to-hip-ratio-calculator.json - Engine module: https://aifithub.io/engines/waist-to-hip-ratio-calculator.js ### Sleep Calculator - URL: https://aifithub.io/sleep-calculator/ - Category: Recovery - Summary: Calculate optimal bed and wake times based on 90-minute sleep cycles. - Contract: https://aifithub.io/contracts/sleep-calculator.json - Engine module: https://aifithub.io/engines/sleep-calculator.js ### FFMI Calculator - URL: https://aifithub.io/ffmi-calculator/ - Category: Body Composition - Summary: Calculate Fat-Free Mass Index to gauge muscularity and compare against natural benchmarks. - Contract: https://aifithub.io/contracts/ffmi-calculator.json - Engine module: https://aifithub.io/engines/ffmi-calculator.js ### VO2 Max Estimator - URL: https://aifithub.io/vo2-max-estimator/ - Category: Cardio - Summary: Estimate aerobic capacity with the Cooper 12-minute run or Rockport 1-mile walk field tests. - Contract: https://aifithub.io/contracts/vo2-max-estimator.json - Engine module: https://aifithub.io/engines/vo2-max-estimator.js ### Strength Standards Calculator - URL: https://aifithub.io/strength-standards-calculator/ - Category: Strength - Summary: Rank your lifts from Beginner to Elite based on bodyweight ratios. - Contract: https://aifithub.io/contracts/strength-standards-calculator.json - Engine module: https://aifithub.io/engines/strength-standards-calculator.js ### DOTS & Wilks Score Calculator - URL: https://aifithub.io/dots-score-calculator/ - Category: Strength - Summary: DOTS & Wilks score calculator: compare powerlifting strength across weight classes with IPF DOTS and Wilks-2020 coefficients. - Contract: https://aifithub.io/contracts/dots-score-calculator.json - Engine module: https://aifithub.io/engines/dots-score-calculator.js ### Lean Body Mass Calculator - URL: https://aifithub.io/lean-body-mass-calculator/ - Category: Body Composition - Summary: Estimate lean body mass using Boer, James, and Hume formulas from height and weight. - Contract: https://aifithub.io/contracts/lean-body-mass-calculator.json - Engine module: https://aifithub.io/engines/lean-body-mass-calculator.js ### Walking Calorie Calculator - URL: https://aifithub.io/walking-calorie-calculator/ - Category: Cardio - Summary: Estimate calories burned from walking using speed, duration, body weight, and incline. - Contract: https://aifithub.io/contracts/walking-calorie-calculator.json - Engine module: https://aifithub.io/engines/walking-calorie-calculator.js ### Calories Burned Calculator - URL: https://aifithub.io/calories-burned-calculator/ - Category: Cardio - Summary: Estimate exercise calorie burn from body weight, duration, MET intensity, and incline. - Contract: https://aifithub.io/contracts/calories-burned-calculator.json - Engine module: https://aifithub.io/engines/calories-burned-calculator.js ### Intermittent Fasting Window Planner - URL: https://aifithub.io/intermittent-fasting-window-planner/ - Category: Nutrition - Summary: Plan protocol-based eating and fasting windows with a 24-hour timeline and 5:2 day picker. - Contract: https://aifithub.io/contracts/intermittent-fasting-window-planner.json - Engine module: https://aifithub.io/engines/intermittent-fasting-window-planner.js ### Creatine Intake Calculator - URL: https://aifithub.io/creatine-intake-calculator/ - Category: Nutrition - Summary: Estimate creatine maintenance and loading doses from body weight and training frequency. - Contract: https://aifithub.io/contracts/creatine-intake-calculator.json - Engine module: https://aifithub.io/engines/creatine-intake-calculator.js ### Workout Volume Calculator - URL: https://aifithub.io/workout-volume-calculator/ - Category: Strength - Summary: Calculate total training volume and compare against optimal ranges per muscle group. - Contract: https://aifithub.io/contracts/workout-volume-calculator.json - Engine module: https://aifithub.io/engines/workout-volume-calculator.js ### Food-to-Exercise Converter - URL: https://aifithub.io/food-to-exercise-converter/ - Category: Nutrition - Summary: See how long you need to exercise to burn off any food, personalized by bodyweight. - Contract: https://aifithub.io/contracts/food-to-exercise-converter.json - Engine module: https://aifithub.io/engines/food-to-exercise-converter.js ### Resting Heart Rate Calculator - URL: https://aifithub.io/resting-heart-rate-calculator/ - Category: Cardio - Summary: Assess cardiovascular fitness from your resting heart rate — how it rates for your age and sex, and the reading that rates Good. - Contract: https://aifithub.io/contracts/resting-heart-rate-calculator.json - Engine module: https://aifithub.io/engines/resting-heart-rate-calculator.js ### Flexibility Score Calculator - URL: https://aifithub.io/flexibility-score-calculator/ - Category: Body Composition - Summary: Estimate your flexibility percentile and rating from a sit-and-reach test score, adjusted for age and sex. - Contract: https://aifithub.io/contracts/flexibility-score-calculator.json - Engine module: https://aifithub.io/engines/flexibility-score-calculator.js ### Swim Pace Calculator - URL: https://aifithub.io/swim-pace-calculator/ - Category: Cardio - Summary: Calculate swim pace, total time, or distance with SWOLF and effort-zone context. - Contract: https://aifithub.io/contracts/swim-pace-calculator.json - Engine module: https://aifithub.io/engines/swim-pace-calculator.js ### Run Training Paces Calculator - URL: https://aifithub.io/run-training-paces-calculator/ - Category: Cardio - Summary: Get personalized Easy, Tempo, Threshold, Interval, and Speed training paces from a recent race time using the Daniels VDOT method. - Contract: https://aifithub.io/contracts/run-training-paces-calculator.json - Engine module: https://aifithub.io/engines/run-training-paces-calculator.js ### Sweat Rate Calculator - URL: https://aifithub.io/sweat-rate-calculator/ - Category: Recovery - Summary: Calculate your personal sweat rate from pre/post-exercise weigh-ins and estimate fluid and sodium losses using ACSM guidelines. - Contract: https://aifithub.io/contracts/sweat-rate-calculator.json - Engine module: https://aifithub.io/engines/sweat-rate-calculator.js ### Race Time Predictor - URL: https://aifithub.io/race-time-predictor/ - Category: Cardio - Summary: Race Time predictor: predict finish times across 5K, 10K, half marathon, and marathon from any known race result using Riegel's formula. - Contract: https://aifithub.io/contracts/race-time-predictor.json - Engine module: https://aifithub.io/engines/race-time-predictor.js ### Cycling Power & FTP Zone Calculator - URL: https://aifithub.io/cycling-power-ftp-zone-calculator/ - Category: Cardio - Summary: Calculate your 7 Coggan power training zones from FTP or a 20-minute test result with W/kg ratio. - Contract: https://aifithub.io/contracts/cycling-power-ftp-zone-calculator.json - Engine module: https://aifithub.io/engines/cycling-power-ftp-zone-calculator.js ### Plate Loading Calculator - URL: https://aifithub.io/plate-loading-calculator/ - Category: Strength - Summary: Calculate which weight plates to load on each side of a barbell to hit your target weight in kg or lbs. - Contract: https://aifithub.io/contracts/plate-loading-calculator.json - Engine module: https://aifithub.io/engines/plate-loading-calculator.js ### Treadmill Pace Converter - URL: https://aifithub.io/treadmill-pace-converter/ - Category: Cardio - Summary: Convert treadmill speed to running pace with incline-adjusted flat equivalent, projected race times, and calorie estimates. - Contract: https://aifithub.io/contracts/treadmill-pace-converter.json - Engine module: https://aifithub.io/engines/treadmill-pace-converter.js ### Zone 2 Heart Rate Calculator - URL: https://aifithub.io/zone-2-heart-rate-calculator/ - Category: Cardio - Summary: Calculate your Zone 2 heart rate with Maffetone, Karvonen, % Max HR, and lactate threshold methods compared side by side. - Contract: https://aifithub.io/contracts/zone-2-heart-rate-calculator.json - Engine module: https://aifithub.io/engines/zone-2-heart-rate-calculator.js ### DOTS vs Wilks vs GL Calculator - URL: https://aifithub.io/dots-wilks-gl-combined-calculator/ - Category: Strength - Summary: Compare DOTS, Wilks, and Goodlift scores side by side to see which system rates your powerlifting total highest. - Contract: https://aifithub.io/contracts/dots-wilks-gl-combined-calculator.json - Engine module: https://aifithub.io/engines/dots-wilks-gl-combined-calculator.js ### RPE to Percentage Converter - URL: https://aifithub.io/rpe-to-percentage-converter/ - Category: Strength - Summary: Convert RPE and reps to percentage of 1RM with a full interactive RPE chart based on the Tuchscherer table. - Contract: https://aifithub.io/contracts/rpe-to-percentage-converter.json - Engine module: https://aifithub.io/engines/rpe-to-percentage-converter.js ### Strength Percentile Calculator - URL: https://aifithub.io/strength-percentile-calculator/ - Category: Strength - Summary: Find out where your squat, bench, deadlift, or OHP ranks against other lifters by bodyweight and sex. - Contract: https://aifithub.io/contracts/strength-percentile-calculator.json - Engine module: https://aifithub.io/engines/strength-percentile-calculator.js ### Meet Day Attempt Selector - URL: https://aifithub.io/meet-day-attempt-selector/ - Category: Strength - Summary: Plan powerlifting meet attempts with opener, second, and third attempt suggestions based on 1RM and confidence. - Contract: https://aifithub.io/contracts/meet-day-attempt-selector.json - Engine module: https://aifithub.io/engines/meet-day-attempt-selector.js ### Hybrid Training Planner - URL: https://aifithub.io/hybrid-training-planner/ - Category: Planning - Summary: Hybrid training planner: build a weekly schedule that balances running and lifting with interference warnings and recovery guidance. - Contract: https://aifithub.io/contracts/hybrid-training-planner.json - Engine module: https://aifithub.io/engines/hybrid-training-planner.js ### Sleep Debt Calculator - URL: https://aifithub.io/sleep-debt-calculator/ - Category: Recovery - Summary: Track 7 nights of sleep to calculate accumulated sleep debt with a recovery timeline and quality assessment. - Contract: https://aifithub.io/contracts/sleep-debt-calculator.json - Engine module: https://aifithub.io/engines/sleep-debt-calculator.js ### Macro Cycling Calculator - URL: https://aifithub.io/macro-cycling-calculator/ - Category: Nutrition - Summary: Calculate different macros for training days and rest days with carb cycling for recomp, lean bulk, or cut goals. - Contract: https://aifithub.io/contracts/macro-cycling-calculator.json - Engine module: https://aifithub.io/engines/macro-cycling-calculator.js ### Muscle Gain Potential Calculator - URL: https://aifithub.io/muscle-gain-potential-calculator/ - Category: Body Composition - Summary: Estimate your natural muscular potential with the Casey Butt model and see how close you are to your genetic limit. - Contract: https://aifithub.io/contracts/muscle-gain-potential-calculator.json - Engine module: https://aifithub.io/engines/muscle-gain-potential-calculator.js ### Wendler 5/3/1 Planner - URL: https://aifithub.io/wendler-531-planner/ - Category: Strength - Summary: Generate a 4-week Wendler 5/3/1 cycle from squat, bench, deadlift, and overhead-press 1RMs. - Contract: https://aifithub.io/contracts/wendler-531-planner.json - Engine module: https://aifithub.io/engines/wendler-531-planner.js ### Smolov / Sheiko / Texas Method Cycles - URL: https://aifithub.io/smolov-sheiko-texas-cycles/ - Category: Strength - Summary: Generate a Smolov base mesocycle, a Sheiko-style block, or a Texas Method cycle from a single 1RM input. - Contract: https://aifithub.io/contracts/smolov-sheiko-texas-cycles.json - Engine module: https://aifithub.io/engines/smolov-sheiko-texas-cycles.js ### Velocity-Based 1RM Estimator - URL: https://aifithub.io/velocity-based-1rm/ - Category: Strength - Summary: Estimate one-rep max from concentric bar velocity using published load-velocity profiles. - Contract: https://aifithub.io/contracts/velocity-based-1rm.json - Engine module: https://aifithub.io/engines/velocity-based-1rm.js ### Concurrent Training Interference Estimator - URL: https://aifithub.io/concurrent-training-interference/ - Category: Planning - Summary: Estimate strength, hypertrophy, and power gain attenuation from running while lifting (Wilson 2012). - Contract: https://aifithub.io/contracts/concurrent-training-interference.json - Engine module: https://aifithub.io/engines/concurrent-training-interference.js ### Detraining Decay Estimator - URL: https://aifithub.io/detraining-decay/ - Category: Planning - Summary: Estimate 1RM loss across a layoff using the Mujika & Padilla detraining model. - Contract: https://aifithub.io/contracts/detraining-decay.json - Engine module: https://aifithub.io/engines/detraining-decay.js ### Junk Volume Detector - URL: https://aifithub.io/junk-volume-detector/ - Category: Planning - Summary: Junk volume detector: paste a multi-week CSV training log and identify sets that don't drive strength or hypertrophy. - Contract: https://aifithub.io/contracts/junk-volume-detector.json - Engine module: https://aifithub.io/engines/junk-volume-detector.js ### Marathon Pace + Elevation Calculator - URL: https://aifithub.io/marathon-pace-elevation/ - Category: Cardio - Summary: Convert a target marathon time on a hilly course into the flat-equivalent pace you actually need. - Contract: https://aifithub.io/contracts/marathon-pace-elevation.json - Engine module: https://aifithub.io/engines/marathon-pace-elevation.js ### Sweat-Rate + Electrolyte Marathon Plan - URL: https://aifithub.io/sweat-rate-electrolyte-marathon/ - Category: Cardio - Summary: Compute marathon sweat rate, fluid intake, and sodium replacement plan from a single training session. - Contract: https://aifithub.io/contracts/sweat-rate-electrolyte-marathon.json - Engine module: https://aifithub.io/engines/sweat-rate-electrolyte-marathon.js ### Race-Week Taper Planner - URL: https://aifithub.io/race-week-taper/ - Category: Planning - Summary: Build a race-week taper using the Bosquet 2007 meta-analysis with distance-aware depth and weekly plan. - Contract: https://aifithub.io/contracts/race-week-taper.json - Engine module: https://aifithub.io/engines/race-week-taper.js ### Female Athlete Formula Suite - URL: https://aifithub.io/female-athlete-formula-suite/ - Category: Body Composition - Summary: Apply female-specific corrections to FFMI, Mifflin-St Jeor BMR, max heart rate, and body-fat estimation. - Contract: https://aifithub.io/contracts/female-athlete-formula-suite.json - Engine module: https://aifithub.io/engines/female-athlete-formula-suite.js ### HRV Deload Trigger - URL: https://aifithub.io/hrv-deload-trigger/ - Category: Recovery - Summary: Decide whether to deload from 7 days of HRV vs 30-day baseline using the Plews 2014 method. - Contract: https://aifithub.io/contracts/hrv-deload-trigger.json - Engine module: https://aifithub.io/engines/hrv-deload-trigger.js ### Hybrid Athlete Macro Split - URL: https://aifithub.io/hybrid-athlete-macro-split/ - Category: Nutrition - Summary: Get protein, carb, and fat targets for athletes who run + lift, with training-day vs rest-day split. - Contract: https://aifithub.io/contracts/hybrid-athlete-macro-split.json - Engine module: https://aifithub.io/engines/hybrid-athlete-macro-split.js ## Articles (186 total) ### Pillar guides (44) - Body Composition: The Four Lenses: https://aifithub.io/articles/body-composition-the-evidence/ Description: Body composition through four lenses: BMI, FFMI, measured body fat, and energy balance. What each metric answers, where it fails, and the deep dives. Reading: 10 min · Citations: 5 - Endurance Training: The Evidence-Based Levers: https://aifithub.io/articles/endurance-training-the-evidence/ Description: Endurance training, ranked by evidence: intensity distribution, easy-day pace, VO2 max, and the taper, each linked to its deep dive on the science. Reading: 11 min · Citations: 6 - GLP-1 Muscle Loss: Keep Lean Mass with Lifting and Protein: https://aifithub.io/articles/glp-1-muscle-loss-resistance-training-protein/ Description: GLP-1 weight loss costs lean mass: 25-39% of the total. How lifting 2-3x weekly and 1.2-1.6 g/kg protein hold muscle, and where the magnitude is debated. Reading: 11 min · Citations: 8 - How to Build Muscle: The Evidence-Based Levers: https://aifithub.io/articles/how-to-build-muscle-the-evidence/ Description: Build muscle by ranking the five levers the research supports: volume, proximity to failure, load, frequency, and protein, each linked to its deep dive. Reading: 10 min · Citations: 7 - Light vs Heavy Weights for Muscle Growth: The Evidence: https://aifithub.io/articles/light-vs-heavy-loads-hypertrophy/ Description: Light vs heavy load for muscle growth: the Schoenfeld 2017 meta, Morton 2016, and Lasevicius 2018 show similar hypertrophy to failure, load wins 1RM. Reading: 11 min · Citations: 6 - Training to Failure vs Reps in Reserve: What Works: https://aifithub.io/articles/training-to-failure-vs-reps-in-reserve/ Description: Training to failure vs reps in reserve, reviewed: Robinson 2024 recasts the binary debate as a continuous proximity curve where size and strength diverge. Reading: 11 min · Citations: 6 - VO2 Max and Longevity: The 122,000-Patient Mortality Study: https://aifithub.io/articles/vo2max-all-cause-mortality/ Description: VO2 max sits at the center of the 2026 longevity debate: what the 122,007-patient Mandsager 2018 mortality study found, and why fitness has no ceiling. Reading: 12 min · Citations: 5 - TDEE Maintenance Calorie Reference: Age and Activity Level 2026: https://aifithub.io/articles/tdee-maintenance-calorie-reference-by-age-and-activity-2026/ Description: TDEE maintenance calories by Mifflin-St Jeor: age 20–60, five activity levels. Male 80 kg/178 cm and female 65 kg/165 cm reference grids, engine-computed at build time. Reading: 9 min · Citations: 5 - The 2026 Wearable & AI-Coaching Accuracy vs Value Index: https://aifithub.io/articles/wearable-ai-coaching-accuracy-value-index-2026/ Description: The 2026 wearable accuracy vs value index: which Garmin, Oura, WHOOP, Apple Watch and Eight Sleep metrics are validated, and at what price. Sourced. Reading: 16 min · Citations: 14 - Concurrent Training Interference Effect on Hypertrophy: https://aifithub.io/articles/concurrent-training-interference-2026-meta-analysis/ Description: Concurrent training interference on hypertrophy was -0.35 in Wilson 2012 but shrank to -0.11 in the Schumann 2022 meta-analysis; lower-body 1RM showed none. Reading: 12 min · Citations: 11 - Detraining: Endurance Declines Faster Than Strength: https://aifithub.io/articles/detraining-how-fast-you-lose-by-training-age/ Description: Detraining endurance declines faster than strength: VO2 max drops ~7% per week early (Coyle 1984); 1RM holds 2-3 weeks, then 7-10% per week (Andersen 2005). Reading: 12 min · Citations: 10 - Female Athlete Physiology: Where Formulas Fail: https://aifithub.io/articles/female-athlete-physiology-where-formulas-fail/ Description: Female-athlete physiology: where standard fitness formulas (TDEE, body-comp, 1RM) under- or over-predict, and the corrections backed by current literature. Reading: 13 min · Citations: 14 - Hybrid Athlete Macro Splits: https://aifithub.io/articles/hybrid-athlete-macro-split-math/ Description: Hybrid athlete macros: the split between strength and endurance days, periodised carbs around hard sessions, and protein scaling for two-stress training. Reading: 11 min · Citations: 10 - Junk Volume in Hypertrophy: https://aifithub.io/articles/junk-volume-hypertrophy-from-your-log/ Description: Junk volume in hypertrophy: how to read your training log for the sets that aren't producing growth, scoped to the 10-20 sets/week meta-window. Reading: 12 min · Citations: 9 - Marathon Pace and Elevation Adjustments: https://aifithub.io/articles/marathon-pace-elevation-validated/ Description: Marathon pace and elevation: a validated correction for total climb / descent — Strava grade-adjusted pace, Naismith's rule, where they break. Reading: 12 min · Citations: 9 - Polarized vs Threshold Training: 2026 Evidence Review: https://aifithub.io/articles/polarized-vs-threshold-training-2026-systematic-review/ Description: Polarized vs threshold training compared: the Seiler 80/20 model, Stoggl 2014 and Filipas 2021 on what wins for VO2 max and when threshold work pays off. Reading: 13 min · Citations: 12 - Travel and Jet Lag for Athletes: The Recovery Math: https://aifithub.io/articles/travel-jet-lag-athletes-math/ Description: Travel and jet lag for athletes: the time-zone math, melatonin and light exposure timing, and how performance decay tracks with hours misaligned. Reading: 11 min · Citations: 11 - Velocity-Based Training: 1RM From Bar Speed: https://aifithub.io/articles/velocity-based-training-1rm-from-bar-speed/ Description: A load-velocity profile estimates your 1RM from sub-maximal bar speed, no max attempt needed. How the math works, the research, and a worked example. Reading: 13 min · Citations: 12 - Why You Stalled at a 1.5x Bodyweight Squat: https://aifithub.io/articles/why-stalled-1.5x-bw-squat/ Description: Why your squat stalled at 1.5x bodyweight — and the four programming, recovery, and technique levers most lifters should pull before adding volume. Reading: 12 min · Citations: 8 - 4 Week Mini Cut: The Math That Resets Body Fat Between Bulks: https://aifithub.io/articles/mini-cuts-4-week-math-bulks/ Description: 4 week mini cut math: a 20-25% deficit drops ~1.0-1.5% bodyweight weekly, resetting 3-4 points of body fat between bulks. Macros, training, refeed. Reading: 10 min · Citations: 5 - Aggressive Bulk vs Lean Bulk: The Math (Garthe RCT): https://aifithub.io/articles/lean-bulk-vs-aggressive-bulk-math/ Description: Aggressive bulk vs lean bulk, run through the Garthe RCT: a 600-cal surplus added 1.7 kg lean and 1.1 kg fat in 12 weeks vs 1.2 kg lean, zero fat. Reading: 11 min · Citations: 6 - Block vs DUP Periodization: The Hypertrophy Math: https://aifithub.io/articles/block-vs-dup-periodization-hypertrophy-math/ Description: Block periodization concentrates a stimulus. DUP rotates it. The math behind which produces more hypertrophy at a given fatigue cost. Reading: 11 min · Citations: 6 - Body Recomposition for Lifters: The Calorie Math: https://aifithub.io/articles/body-recomposition-lifters-calorie-math/ Description: Body recomposition is real for specific populations under specific conditions. The four conditions, protein math scaled to LBM, 12-week example. Reading: 13 min · Citations: 8 - Carb Periodization for Hybrid Athletes: https://aifithub.io/articles/carb-periodization-hybrid-athletes-math/ Description: Hybrid athletes need different carbs on lift days vs run days. The g/kg math, fueling-window logic, and mode-by-mode periodization. Reading: 11 min · Citations: 6 - Heat Acclimatization: Sodium and Plasma Volume: https://aifithub.io/articles/heat-acclimatization-sodium-plasma-volume/ Description: Heat acclimatization shifts plasma volume up 10-12% in 10-14 days. The sodium math that supports the adaptation and the workouts that drive it. Reading: 10 min · Citations: 6 - Marathon Taper: Reduce Volume 41-60%, Keep Intensity: https://aifithub.io/articles/marathon-taper-volume-reduction-curve/ Description: Marathon taper: cut volume 41-60% over two weeks, keep intensity, trim frequency 10-20% (Bosquet/Mujika 2007). The pooled performance gain was +1.96%. Reading: 11 min · Citations: 7 - Maximum Natural FFMI: The Confounders That Bend the Limit: https://aifithub.io/articles/ffmi-natty-boundaries-data-shows/ Description: Maximum natural FFMI is a soft limit, not a wall: Kouri 1995 put naturals near 25, but glycogen, height over 195 cm, and contest-day bias bend the number. Reading: 12 min · Citations: 6 - Powerlifting Peaking Math: https://aifithub.io/articles/powerlifting-peaking-smolov-sheiko-texas/ Description: Powerlifting peaking compared: Smolov, Sheiko, and Texas Method — volume curves, recovery demands, and the meet-prep windows each handles best. Reading: 12 min · Citations: 7 - Pre-Fatigue Training: When the Math Says It Helps: https://aifithub.io/articles/pre-fatigue-training-when-math-supports-it/ Description: Pre-fatigue protocols (light isolation before compound) work for some populations. The literature on when they help vs when they reduce total volume. Reading: 10 min · Citations: 6 - Race-Time Prediction: VDOT vs Riegel Failure Modes: https://aifithub.io/articles/race-time-prediction-vdot-riegel-failure-modes/ Description: Race-time prediction failure modes: where VDOT, Riegel, and Cameron break — distance regimes, training-status assumptions, and prediction-error bands. Reading: 13 min · Citations: 6 - Recovery Math: How HRV, Sleep, and RPE Predict: https://aifithub.io/articles/recovery-math-hrv-sleep-rpe-prediction/ Description: Recovery math: HRV, sleep, and session-RPE as predictors of next-day readiness. What the literature actually shows and what the consumer apps over-claim. Reading: 11 min · Citations: 7 - RPE Programming: Why the Math Beats the Coach: https://aifithub.io/articles/rpe-based-programming-math-vs-coach/ Description: When RPE prescription dominates fixed %1RM, when it doesn't, and how to calibrate the scale so the math actually works for an intermediate lifter. Reading: 13 min · Citations: 8 - Sleep Debt vs Training Stress: The Interaction: https://aifithub.io/articles/sleep-debt-training-stress-interaction/ Description: Sleep debt and training stress compound nonlinearly. The TRIMP-adjusted recovery model and what 5 hours of sleep does to next-day output. Reading: 10 min · Citations: 6 - Zone 2 Training Methods and Limits: Lactate, HR, Talk Test: https://aifithub.io/articles/zone-2-training-literature-methods-limits/ Description: Zone 2 training methods and limits: lactate meter, Karvonen 60-70% HRR, and the talk test, and where each method's error band blurs the LT1 boundary. Reading: 13 min · Citations: 8 - Bod Pod vs DEXA vs Calipers: Body Fat Accuracy: https://aifithub.io/articles/body-composition-for-athletes/ Description: Bod Pod runs about +/-2-3% body-fat error, DEXA +/-1-2%, calipers +/-3-4%. Compare accuracy, cost, and cadence to pick a body composition method for athletes. Reading: 11 min · Citations: 6 - DOTS vs Wilks vs GL Points: Which Score to Use: https://aifithub.io/articles/dots-vs-wilks-vs-gl/ Description: DOTS vs Wilks vs IPF-GL powerlifting scores compared: same bodyweight polynomial, but DOTS (2019) and GL (2020) replaced 1994 Wilks. Which to quote. Reading: 11 min · Citations: 6 - Evidence-Based Hypertrophy & Powerlifting Programming 2026: https://aifithub.io/articles/evidence-based-programming-2026/ Description: Evidence-based hypertrophy and powerlifting programming for 2026: 10-20 hard sets per muscle weekly, train each twice, load 30-85% near failure, periodize. Reading: 14 min · Citations: 8 - FFMI 25 Natural Limit: The Kouri 1995 Study, Reappraised: https://aifithub.io/articles/natural-muscular-potential-ffmi/ Description: FFMI 25 as the natural muscular limit: what Kouri's 1995 sample of 157 lifters actually measured, and what the 2020 drug-tested reappraisal changed. Reading: 11 min · Citations: 5 - Heart-Rate Zones: Methods Compared: https://aifithub.io/articles/heart-rate-zones-methods-compared/ Description: Heart-rate zone methods compared: Karvonen, %HRmax, %HRR, lactate threshold — accuracy by training age, error bands, and which one for which goal. Reading: 11 min · Citations: 7 - Protein for Muscle Gain: 1.6 g/kg (Morton 2018): https://aifithub.io/articles/protein-for-lifters-2026/ Description: Morton 2018 placed the protein plateau at 1.6 g/kg with a 95% CI upper bound near 2.2 g/kg (49 studies, n=1,863). Cutting raises it to 2.3-3.1 g/kg lean. Reading: 12 min · Citations: 7 - Riegel Formula Exponent 1.06 (Original 1981 Paper): https://aifithub.io/articles/race-time-prediction-riegel-limits/ Description: Riegel formula exponent 1.06 from the original 1981 American Scientist paper: T2 = T1 x (D2/D1)^1.06. Accurate for 5k-21k; raise to 1.10-1.15 for marathons. Reading: 10 min · Citations: 5 - TDEE Formulas Compared: Mifflin vs Harris vs Katch: https://aifithub.io/articles/tdee-formulas-compared/ Description: TDEE formulas compared: Mifflin-St Jeor, Harris-Benedict, Katch-McArdle, WHO/FAO. Population, error bands, and when each estimator is appropriate. Reading: 11 min · Citations: 6 - VO2 Max Field Tests: Which Derivation to Trust: https://aifithub.io/articles/vo2-max-field-tests/ Description: VO2 max field tests compared: Cooper, Rockport, Bruce, Astrand, and the 12-min run — accuracy, population validity, and which derivation to trust. Reading: 11 min · Citations: 7 - Zone 2 Training: What the Literature Says: https://aifithub.io/articles/zone-2-training-what-the-literature-says/ Description: Zone 2 training is work below LT1 (~65-75% HRmax), the easy base of Seiler 80/20. What the literature shows on dose-response, how to find it, and the limits. Reading: 13 min · Citations: 7 ### Focused how-tos and comparisons (142) - COROS APEX 4 vs Garmin fenix 8 2026: https://aifithub.io/articles/coros-apex-4-vs-garmin-fenix-8-2026/ Description: COROS APEX 4 vs Garmin fenix 8 in 2026: verified price, battery, and display. The APEX 4 costs far less and lasts longer; the fenix 8 adds AMOLED and dive. Reading: 8 min · Citations: 6 - Garmin Forerunner 570 vs 265 vs Coros Pace Pro 2026: https://aifithub.io/articles/garmin-forerunner-570-vs-265-vs-coros-pace-pro-2026/ Description: Garmin Forerunner 570 vs 265 vs Coros Pace Pro in 2026: verified price, battery, maps, and GPS. The $349 Pace Pro adds offline maps the Garmins skip. Reading: 7 min · Citations: 7 - How Many Sets Per Week for Hypertrophy? Dose-Response 2026: https://aifithub.io/articles/sets-per-week-hypertrophy-dose-response/ Description: How many sets per week build muscle? The 2026 Pelland meta-regression maps the hypertrophy dose-response curve and turns it into weekly set targets. Reading: 9 min · Citations: 4 - Oura Ring 5 vs WHOOP 5.0 vs Galaxy Ring 2026: Compared: https://aifithub.io/articles/oura-ring-5-vs-whoop-5-vs-galaxy-ring-2026/ Description: Oura Ring 5 vs WHOOP 5.0 vs Galaxy Ring in 2026: verified prices. Oura tracks sleep best, WHOOP coaches recovery, Galaxy Ring skips the subscription. Reading: 8 min · Citations: 7 - Strava + Runna Bundle vs TrainingPeaks (2026): https://aifithub.io/articles/strava-runna-bundle-vs-trainingpeaks-2026/ Description: Strava + Runna bundle ($149.99/yr) vs TrainingPeaks Premium ($134.99/yr) in 2026: adaptive run coaching plus Claude AI versus structured-plan load tracking. Reading: 7 min · Citations: 7 - Best Macro Tracking Apps 2026: MacroFactor vs Cronometer vs MyFitnessPal: https://aifithub.io/articles/best-macro-tracking-apps-macrofactor-vs-cronometer-vs-myfitnesspal-2026/ Description: Best macro tracking apps 2026: MacroFactor vs Cronometer vs MyFitnessPal on price, database accuracy, and adaptive TDEE, with studies cited. Reading: 8 min · Citations: 7 - Garmin vs COROS vs Polar Running Watch 2026: Marathon Pick: https://aifithub.io/articles/garmin-vs-coros-vs-polar-running-watch-2026/ Description: Garmin vs COROS vs Polar running watch 2026 for marathon and half training: verified battery, GPS accuracy, training metrics, and price compared. Reading: 8 min · Citations: 7 - Smart Scale Body-Fat Accuracy 2026: Withings vs Renpho vs Eufy: https://aifithub.io/articles/smart-scale-body-fat-accuracy-withings-vs-renpho-vs-eufy-2026/ Description: Smart scale body-fat accuracy 2026: Withings vs Renpho vs Eufy, and how close BIA really gets to DEXA, with peer-reviewed validation studies cited. Reading: 8 min · Citations: 6 - Whoop vs Oura vs Garmin 2026: HRV & Recovery Accuracy: https://aifithub.io/articles/whoop-vs-oura-vs-garmin-hrv-recovery-accuracy-2026/ Description: Whoop vs Oura vs Garmin 2026: HRV, recovery, and sleep tracking accuracy compared against ECG and polysomnography in independent peer-reviewed studies. Reading: 9 min · Citations: 6 - Apple Watch Ultra 3 vs Garmin Fenix 8 2026: Battery, Price: https://aifithub.io/articles/apple-watch-ultra-3-vs-garmin-fenix-8-2026/ Description: Apple Watch Ultra 3 vs Garmin fenix 8 in 2026: verified price and battery. Ultra 3 is cheaper and iPhone-only; the fenix 8 lasts weeks and dives. Reading: 8 min · Citations: 5 - Apple Watch Ultra 3 vs Garmin Forerunner 970 2026: https://aifithub.io/articles/apple-watch-ultra-3-vs-garmin-forerunner-970-2026/ Description: Apple Watch Ultra 3 vs Garmin Forerunner 970 in 2026: verified price and battery. Ultra 3 is iPhone-only with apps; the 970 runs weeks and Android. Reading: 8 min · Citations: 5 - Are Smart Scales Accurate in 2026? Weight vs Body Fat: https://aifithub.io/articles/are-smart-scales-accurate-2026/ Description: Are smart scales accurate in 2026? Studies show they are reliable for weight but inaccurate for body-fat percentage versus DEXA. Read the trend. Reading: 6 min · Citations: 3 - Best Chest Strap Heart Rate Monitors 2026: Top Picks: https://aifithub.io/articles/best-chest-strap-heart-rate-monitors-2026/ Description: Best chest strap heart rate monitors 2026: the Polar H10 wins overall, the Garmin HRM 600 for runners, the Wahoo TRACKR for a rechargeable battery. Reading: 7 min · Citations: 4 - Best Recovery Trackers 2026: WHOOP vs Oura vs Garmin: https://aifithub.io/articles/best-recovery-trackers-2026/ Description: Best recovery trackers 2026: WHOOP for daily coaching, the Oura Ring 4 for validated sleep and HRV, or a Garmin watch for recovery with no subscription. Reading: 7 min · Citations: 5 - Best Running Watches 2026: Picks by Tier and Budget: https://aifithub.io/articles/best-running-watches-2026/ Description: Best running watches 2026: the COROS PACE 4 wins value at $249, with picks for maps, the Garmin ecosystem, and the flagship Forerunner 970. Reading: 8 min · Citations: 6 - Best Smart Rings 2026: Oura vs Ultrahuman and the Picks: https://aifithub.io/articles/best-smart-rings-2026/ Description: Best smart rings 2026: the Oura Ring 4 wins overall on validated sleep data; the Ultrahuman Ring PRO is the best subscription-free pick. Reading: 7 min · Citations: 5 - COROS PACE 4 vs Garmin Forerunner 165 2026: GPS, Battery: https://aifithub.io/articles/coros-pace-4-vs-garmin-forerunner-165-2026/ Description: COROS PACE 4 vs Garmin Forerunner 165 in 2026: verified price, GPS, and battery. At $249 the PACE 4 has dual-band GPS and double the battery. Reading: 7 min · Citations: 5 - COROS PACE Pro vs Garmin Forerunner 265 2026: Maps, Battery: https://aifithub.io/articles/coros-pace-pro-vs-garmin-forerunner-265-2026/ Description: COROS PACE Pro vs Garmin Forerunner 265 in 2026: verified price, maps, and battery. The PACE Pro adds offline maps for $100 less; FR265 streams music. Reading: 7 min · Citations: 5 - Eight Sleep Pod 5 vs Oura Ring 4 2026: Sleep Compared: https://aifithub.io/articles/eight-sleep-pod-5-vs-oura-ring-4-2026/ Description: Eight Sleep Pod 5 vs Oura Ring 4 in 2026: verified prices. The Pod 5 changes your sleep with temperature; the Oura Ring 4 measures it best. Reading: 7 min · Citations: 4 - Garmin Edge 1050 vs 540 2026: Touchscreen, Battery, Price: https://aifithub.io/articles/garmin-edge-1050-vs-540-2026/ Description: Garmin Edge 1050 vs 540 in 2026: verified price, battery, and display. The 540 wins value and battery; the 1050 adds a big touchscreen and speaker. Reading: 7 min · Citations: 4 - Garmin fenix 8 vs Enduro 3 2026: Battery, Price, Specs: https://aifithub.io/articles/garmin-fenix-8-vs-enduro-3-2026/ Description: Garmin fenix 8 vs Enduro 3 in 2026: verified price, battery, and features. The Enduro 3 wins battery and price; the fenix 8 adds AMOLED and dive. Reading: 7 min · Citations: 4 - Garmin Forerunner 970 vs 965 2026: ECG, Battery, Price: https://aifithub.io/articles/garmin-forerunner-970-vs-965-2026/ Description: Garmin Forerunner 970 vs 965 in 2026: verified price, battery, and ECG. The 970 adds ECG and a flashlight; the 965 lasts longer for $250 less. Reading: 7 min · Citations: 5 - Garmin Forerunner 970 vs COROS PACE 4 2026: Battery, Maps: https://aifithub.io/articles/garmin-forerunner-970-vs-coros-pace-4-2026/ Description: Garmin Forerunner 970 vs COROS PACE 4 in 2026: verified price, battery, and maps. The PACE 4 wins value and battery; the 970 adds maps and ECG. Reading: 8 min · Citations: 5 - Is Apple Watch Calorie Count Accurate? (2026 Evidence): https://aifithub.io/articles/is-apple-watch-calorie-count-accurate-2026/ Description: Is the Apple Watch calorie count accurate in 2026? The best wrist estimator in named research, but still off ~27%; read it as a trend, not truth. Reading: 7 min · Citations: 3 - Is Garmin Calorie Count Accurate? (2026 Evidence): https://aifithub.io/articles/is-garmin-calorie-count-accurate-2026/ Description: Is Garmin's calorie count accurate in 2026? A named validation found ~19% error and overestimation; trust it as a trend, not a measurement. Reading: 7 min · Citations: 3 - Is the Oura Ring Accurate in 2026? What the Studies Show: https://aifithub.io/articles/is-oura-ring-accurate-2026/ Description: Is the Oura Ring accurate in 2026? Peer-reviewed studies rate it among the best for sleep and overnight HRV, but it is not a workout heart-rate device. Reading: 7 min · Citations: 4 - Is WHOOP Accurate in 2026? What the Studies Show: https://aifithub.io/articles/is-whoop-accurate-2026/ Description: Is WHOOP accurate in 2026? Peer-reviewed studies say yes for resting and overnight HR and HRV, but wrist sensors lag a chest strap during intervals. Reading: 7 min · Citations: 4 - Optical Wrist vs Chest Strap HR: What Studies Show 2026: https://aifithub.io/articles/optical-wrist-vs-chest-strap-hr-what-studies-show-2026/ Description: Optical wrist heart rate vs a chest strap: what the validation studies show in 2026. Accuracy holds at steady effort and degrades during intervals. Reading: 8 min · Citations: 6 - Polar H10 vs Garmin HRM 600 2026: Accuracy, Features: https://aifithub.io/articles/polar-h10-vs-garmin-hrm-600-2026/ Description: Polar H10 vs Garmin HRM 600 in 2026: verified price and features. Both are ECG straps; the H10 is cheaper, the HRM 600 adds running dynamics. Reading: 7 min · Citations: 4 - Recovery & Readiness Scores: What the Evidence Says 2026: https://aifithub.io/articles/recovery-readiness-scores-what-evidence-says-2026/ Description: Recovery and readiness scores in 2026: HRV and resting heart rate inputs are validated, but the WHOOP, Oura and Garmin composite scores are not. Reading: 8 min · Citations: 5 - Ultrahuman Ring PRO vs Oura Ring 4 2026: Subscription, Battery: https://aifithub.io/articles/ultrahuman-ring-pro-vs-oura-ring-4-2026/ Description: Ultrahuman Ring PRO vs Oura Ring 4 in 2026: verified price and battery. The Ring PRO drops the subscription and lasts 15 days; Oura has the validation. Reading: 7 min · Citations: 5 - Which Sleep-Stage Metrics Are Validated 2026: https://aifithub.io/articles/which-sleep-stage-metrics-are-validated-2026/ Description: Which wearable sleep-stage metrics are validated in 2026: sleep-versus-wake is reliable, deep and REM staging is not. The polysomnography evidence. Reading: 8 min · Citations: 5 - WHOOP 5 vs Garmin CIRQA 2026: What We Actually Know: https://aifithub.io/articles/whoop-5-vs-garmin-cirqa-2026/ Description: WHOOP 5 vs Garmin CIRQA in 2026: WHOOP is verified and subscription-only; the CIRQA is unannounced, so its price and specs are leaks, not confirmed. Reading: 7 min · Citations: 5 - WHOOP 5 vs Ultrahuman Ring PRO 2026: Cost, Battery: https://aifithub.io/articles/whoop-5-vs-ultrahuman-ring-pro-2026/ Description: WHOOP 5 vs Ultrahuman Ring PRO in 2026: verified price, battery, and accuracy. WHOOP wins coaching; the Ring PRO is subscription-free at $479. Reading: 7 min · Citations: 5 - Zwift vs MyWhoosh 2026: Free vs Paid Indoor Cycling: https://aifithub.io/articles/zwift-vs-mywhoosh-2026/ Description: Zwift vs MyWhoosh in 2026: verified pricing and features. Zwift wins community and racing depth; MyWhoosh is a capable free indoor-cycling app. Reading: 7 min · Citations: 4 - Amazfit vs Garmin 2026: Accuracy, Battery and Value Compared: https://aifithub.io/articles/amazfit-vs-garmin-2026/ Description: Amazfit vs Garmin in 2026: verified prices, GPS and heart-rate accuracy, battery life and subscriptions, and where cheaper Amazfit closes the gap. Reading: 7 min · Citations: 5 - Best Cycling Computers 2026: Garmin Edge vs Wahoo ELEMNT: https://aifithub.io/articles/best-cycling-computers-2026/ Description: Best cycling computers 2026: the mid-tier Garmin Edge 840 or Wahoo ROAM v3 wins for most riders. Verified prices, battery and which tier to buy. Reading: 8 min · Citations: 6 - Best Fitness Trackers 2026: Garmin, Whoop, Oura, Apple, Fitbit: https://aifithub.io/articles/best-fitness-trackers-2026/ Description: Best fitness trackers 2026: Garmin needs no subscription, Whoop and Oura lead recovery, Apple Watch and Fitbit cover mainstream. Verified prices. Reading: 8 min · Citations: 6 - Best Free 1RM & Strength Calculators 2026: Honest Guide: https://aifithub.io/articles/best-free-1rm-strength-calculators-2026/ Description: Best free 1RM and strength calculators 2026: estimate your max, score a total with DOTS, and rank your strength. How they work and where they break. Reading: 8 min · Citations: 5 - Best Free TDEE & Calorie Calculators 2026: Honest vs the Apps: https://aifithub.io/articles/best-free-tdee-calorie-calculators-2026/ Description: Best free TDEE and calorie calculators 2026: free Mifflin-St Jeor tools beat app upsells. How they work and an honest take vs MyFitnessPal. Reading: 7 min · Citations: 5 - Best Heart Rate Monitors 2026: Chest Straps vs Armbands: https://aifithub.io/articles/best-heart-rate-monitors-2026/ Description: Best heart rate monitors 2026: Polar H10 leads chest straps, Garmin HRM-Pro Plus for Garmin owners, Verity Sense for armbands. Verified prices. Reading: 8 min · Citations: 6 - Best Running App 2026: Runna vs Nike vs Garmin Coach: https://aifithub.io/articles/best-running-app-2026-runna-vs-nike-run-club-vs-garmin-coach/ Description: Best running app 2026: Runna is $119.99/yr for the adaptive AI coach, Nike Run Club is free, and Garmin Coach is free for Garmin owners. Verified prices. Reading: 7 min · Citations: 4 - Best Sleep Trackers 2026: Oura, Whoop, Eight Sleep Compared: https://aifithub.io/articles/best-sleep-trackers-2026/ Description: Best sleep trackers 2026: Oura Ring 4 leads sleep-first rings, Whoop folds it into recovery, Eight Sleep acts on the data. Verified prices and limits. Reading: 8 min · Citations: 6 - Best Smart Scales 2026: Renpho, Eufy, Withings Compared: https://aifithub.io/articles/best-smart-scales-2026/ Description: Best smart scales 2026: all share the same bioimpedance body-fat method, so price and app decide it. Renpho, Eufy P3, Withings, verified facts. Reading: 8 min · Citations: 6 - Best Workout & Training Apps 2026: Hevy, Fitbod, RP, TrainerRoad: https://aifithub.io/articles/best-workout-training-apps-2026/ Description: Best workout apps 2026: Hevy is the cheapest logger, Fitbod generates workouts, RP runs volume periodization. Verified pricing and the right pick. Reading: 8 min · Citations: 6 - Chest Strap vs Optical Heart Rate Accuracy 2026: The Gap: https://aifithub.io/articles/chest-strap-vs-optical-heart-rate-accuracy-2026/ Description: Chest strap vs optical heart rate accuracy in 2026: ECG straps track within 1-2 bpm; optical lags by 5-15 bpm at high intensity. Verified studies. Reading: 7 min · Citations: 5 - DEXA vs Smart Scale Body Fat Accuracy 2026: How Far Off: https://aifithub.io/articles/dexa-vs-smart-scale-body-fat-2026/ Description: DEXA vs smart scale body fat accuracy in 2026: scales underestimate fat mass by 2.2 to 4.4 kg vs DEXA. Verified studies and how to use a scale right. Reading: 7 min · Citations: 4 - Eight Sleep Pod vs Sleep Number 2026: Cost and Subscription: https://aifithub.io/articles/eight-sleep-pod-vs-sleep-number-2026/ Description: Eight Sleep Pod vs Sleep Number in 2026: verified prices and the subscription gap. Eight Sleep needs a membership; Sleep Number tracking is free. Reading: 7 min · Citations: 4 - Fitbit vs Apple Watch 2026: Price, Subscription and Features: https://aifithub.io/articles/fitbit-vs-apple-watch-2026/ Description: Fitbit vs Apple Watch in 2026: verified prices, the new Google Health Premium subscription, free tracking tiers and which to buy on iPhone versus Android. Reading: 7 min · Citations: 5 - Garmin Connect vs intervals.icu 2026: Free Training Analysis: https://aifithub.io/articles/garmin-connect-vs-intervals-icu-2026/ Description: Garmin Connect vs intervals.icu in 2026: intervals.icu gives the free CTL/ATL/Form chart; Garmin recovery metrics are free, Connect+ adds AI on top. Reading: 7 min · Citations: 4 - Garmin Edge 540 vs 840 2026: What the $100 Touchscreen Buys: https://aifithub.io/articles/garmin-edge-540-vs-840-2026/ Description: Garmin Edge 540 vs 840 in 2026: same GNSS, battery and metrics; the $100 gap is the touchscreen and map storage. Verified specs and which to buy. Reading: 7 min · Citations: 4 - Garmin vs Apple Watch for Running 2026: GPS, Battery, Cost: https://aifithub.io/articles/garmin-vs-apple-watch-for-running-2026/ Description: Garmin Forerunner 970 vs Apple Watch Ultra 3 for running in 2026: Garmin wins GPS battery (21h vs 14h), both dual-frequency. Verified specs and prices. Reading: 7 min · Citations: 4 - Garmin vs COROS 2026: Battery, GPS and Subscription Compared: https://aifithub.io/articles/garmin-vs-coros-2026/ Description: Garmin vs COROS in 2026: the COROS PACE 4 runs 41h GPS with dual-band, the Forerunner 165 leans on Garmin's ecosystem, and Connect+ stays optional. Reading: 8 min · Citations: 6 - Hevy vs Strong vs Fitbod 2026: Pricing and Features Compared: https://aifithub.io/articles/hevy-vs-strong-vs-fitbod-2026/ Description: Hevy vs Strong vs Fitbod in 2026: verified prices and free tiers. Hevy and Strong are loggers, Fitbod generates workouts. Which gym app to pick. Reading: 7 min · Citations: 5 - InBody vs DEXA Accuracy 2026: Which Body-Comp Scan to Trust: https://aifithub.io/articles/inbody-vs-dexa-body-composition-accuracy-2026/ Description: InBody vs DEXA accuracy in 2026: DEXA is the reference method; InBody is precise but offset with wide limits of agreement. Verified studies and cost. Reading: 7 min · Citations: 5 - Is MyFitnessPal's TDEE Accurate in 2026?: https://aifithub.io/articles/is-myfitnesspal-tdee-accurate-2026/ Description: MyFitnessPal's TDEE in 2026 isn't a true TDEE: it returns a Mifflin-St Jeor goal, accurate within 10% for 70-82% of people. What that means for you. Reading: 7 min · Citations: 5 - Lose It vs MyFitnessPal vs Lifesum 2026: Best Calorie App: https://aifithub.io/articles/lose-it-vs-myfitnesspal-vs-lifesum-2026/ Description: Lose It vs MyFitnessPal vs Lifesum in 2026: Lose It is the cheapest Premium, MyFitnessPal gates the barcode scanner. Verified prices and free tiers. Reading: 7 min · Citations: 4 - MacroFactor vs Cronometer 2026: Adaptive TDEE vs Micros: https://aifithub.io/articles/macrofactor-vs-cronometer-2026/ Description: MacroFactor vs Cronometer in 2026: verified prices and free tiers. MacroFactor has adaptive TDEE coaching; Cronometer tracks micronutrients deeper. Reading: 6 min · Citations: 4 - MyFitnessPal vs Cronometer 2026: Micronutrients, Accuracy, Cost: https://aifithub.io/articles/myfitnesspal-vs-cronometer-2026/ Description: MyFitnessPal vs Cronometer 2026: lab-analysed micronutrient data (84 nutrients free) vs crowd-sourced breadth, with verified Gold pricing and free-tier limits. Reading: 6 min · Citations: 4 - MyFitnessPal vs MacroFactor 2026: Adaptive TDEE, Accuracy, Cost: https://aifithub.io/articles/myfitnesspal-vs-macrofactor-2026/ Description: MyFitnessPal vs MacroFactor in 2026: adaptive weight-trend TDEE vs static formula, verified pricing ($71.99 vs €79.99/yr), and the 3-year cost math compared. Reading: 7 min · Citations: 4 - Oura Ring vs Apple Watch Sleep Tracking 2026: https://aifithub.io/articles/oura-ring-vs-apple-watch-sleep-2026/ Description: Oura Ring vs Apple Watch sleep tracking in 2026: Oura wins stage accuracy (75-91% vs PSG) and battery; Apple Watch is free. Verified studies and pricing. Reading: 7 min · Citations: 5 - Pixel Watch vs Apple Watch 2026: Price, Fitness and Pairing: https://aifithub.io/articles/pixel-watch-vs-apple-watch-2026/ Description: Pixel Watch vs Apple Watch in 2026: verified prices, Google Health subscription facts, battery life and the Android-versus-iPhone pairing that decides it. Reading: 6 min · Citations: 5 - Polar vs Garmin Heart Rate Accuracy 2026: H10 vs HRM-Pro Plus: https://aifithub.io/articles/polar-vs-garmin-heart-rate-accuracy-2026/ Description: Polar vs Garmin heart-rate accuracy in 2026: peer-reviewed validation puts the H10 and HRM-Pro chest straps near-ECG, while wrist optical drifts under load. Reading: 8 min · Citations: 6 - RENPHO vs eufy Smart Scale 2026: Best Budget Body-Fat Scale: https://aifithub.io/articles/renpho-vs-eufy-smart-scale-2026/ Description: RENPHO vs eufy smart scale in 2026: eufy discontinued its US scale line, RENPHO Elis is current. Verified specs, prices, and BIA accuracy reality. Reading: 7 min · Citations: 5 - Renpho vs Withings Smart Scale 2026: Which to Buy: https://aifithub.io/articles/withings-body-vs-renpho-smart-scale-2026/ Description: Renpho vs Withings smart scales: RENPHO Elis is budget Bluetooth, Withings Body Smart is $129.95 Wi-Fi, and both body-fat readings are BIA estimates. Reading: 7 min · Citations: 5 - RP Hypertrophy App vs Fitbod 2026: Which Strength App: https://aifithub.io/articles/rp-hypertrophy-app-vs-fitbod-2026/ Description: RP Hypertrophy App vs Fitbod in 2026: RP is $299.99/yr volume-landmark periodization; Fitbod is $95.99/yr recovery-modeled AI workouts. Which fits you. Reading: 7 min · Citations: 4 - Runna Pricing 2026 vs Free Garmin Coach: Plans Compared: https://aifithub.io/articles/runna-vs-garmin-coach-2026/ Description: Runna pricing 2026 is $19.99/mo or $119.99/yr with a 7-day trial vs free Garmin Coach. Distances, strength and mobility, and watch support compared. Reading: 7 min · Citations: 4 - Skinfold Calipers vs BIA Scale vs DEXA: Accuracy 2026: https://aifithub.io/articles/skinfold-calipers-vs-bia-scale-vs-dexa-accuracy-2026/ Description: Skinfold caliper vs BIA scale vs DEXA accuracy in 2026: DEXA ~1-2%, skinfolds ~3.5%, and why smart scales underestimate body fat. Backed by validation studies. Reading: 7 min · Citations: 5 - Strava vs Garmin Connect vs Intervals.icu 2026: https://aifithub.io/articles/strava-vs-garmin-connect-vs-intervals-icu-2026/ Description: Strava vs Garmin Connect vs Intervals.icu 2026: Strava paywalls its analysis behind a subscription; Garmin Connect and intervals.icu keep core analysis free. Reading: 7 min · Citations: 4 - Strava vs TrainingPeaks 2026: Prices & Plans Compared: https://aifithub.io/articles/strava-vs-trainingpeaks-2026/ Description: Strava vs TrainingPeaks 2026: Strava costs $11.99/mo or $79.99/yr; TrainingPeaks Premium is $19.95/mo or $134.99/yr, and the PMC is a Premium feature. Reading: 7 min · Citations: 6 - TrainerRoad vs Zwift vs Wahoo SYSTM 2026: Price and Focus: https://aifithub.io/articles/trainerroad-vs-zwift-vs-wahoo-systm-2026/ Description: TrainerRoad vs Zwift vs Wahoo SYSTM in 2026: verified subscription prices and focus. Wahoo SYSTM is cheapest; TrainerRoad coaches, Zwift motivates. Reading: 7 min · Citations: 5 - Ultrahuman Ring vs Oura Ring 2026: Subscription and Accuracy: https://aifithub.io/articles/ultrahuman-ring-vs-oura-ring-2026/ Description: Ultrahuman Ring vs Oura Ring in 2026: the Ring Air is a one-time $349 with no subscription; Oura adds a membership. Multi-year cost math and validation data. Reading: 7 min · Citations: 5 - Wahoo ELEMNT vs Garmin Edge 2026: Bike Computers Compared: https://aifithub.io/articles/wahoo-elemnt-vs-garmin-edge-2026/ Description: Wahoo ELEMNT vs Garmin Edge in 2026: verified bike-computer prices, battery, and GPS. Wahoo is simpler; Garmin packs the deepest feature set. Reading: 7 min · Citations: 5 - Whoop vs Garmin for Recovery 2026: Do You Need Both?: https://aifithub.io/articles/whoop-vs-garmin-for-recovery-2026/ Description: Whoop vs Garmin for recovery in 2026: Garmin's Body Battery and HRV Status are free with the device; Whoop is €199/yr+. Verified pricing and score differences. Reading: 7 min · Citations: 5 - Whoop vs Oura Ring: Two-Way Head-to-Head 2026: https://aifithub.io/articles/whoop-vs-oura-ring-2026/ Description: Whoop vs Oura Ring head-to-head: Oura edges HRV and sleep accuracy, Whoop wins continuous strain. Verified pricing and full 3-year cost of ownership. Reading: 7 min · Citations: 5 - Whoop vs Oura vs Garmin: Cost & Subscriptions 2026: https://aifithub.io/articles/whoop-5-vs-oura-ring-4-vs-garmin-2026/ Description: Whoop 5.0 vs Oura Ring 4 vs Garmin in 2026: Whoop from EUR 199/yr, Oura $349 plus $5.99/mo, Garmin free. Verified prices, battery, and sensors compared. Reading: 7 min · Citations: 6 - 1500m Freestyle in 30 Minutes: Pace and SWOLF Walkthrough: https://aifithub.io/articles/swim-pace-1500m-freestyle-30-minutes/ Description: 1500m freestyle in 30:00 means 2:00/100m, 1:49.7/100yd, SWOLF 50, Tempo effort. The pace breakdown, stroke efficiency, and follow-on training plan. Reading: 6 min · Citations: 3 - 16:8 Intermittent Fasting Starting at Noon: A Realistic Schedule: https://aifithub.io/articles/intermittent-fasting-16-8-12pm-first-meal/ Description: Intermittent 16:8 with a noon first meal: the eating window, training-window timing, and where protein distribution math creates a real problem. Reading: 6 min · Citations: 4 - 20-Week Recomp: 84kg/24% to Target 18% Body Fat: https://aifithub.io/articles/body-recomposition-20-week-84kg-24pct-male/ Description: Body recomp plan for an 84 kg male at 24% body fat, 20-week target 18%: 338 kcal/day deficit, 0.31 kg/week pace, 6.15 kg fat to lose, 140 g protein. Reading: 7 min · Citations: 3 - 3:15 Marathon Pace: Daniels VDOT Training Zones: https://aifithub.io/articles/running-paces-marathon-pr-3-15-mcmillan/ Description: 3:15 marathon pace from Daniels VDOT 48.7 (4:37/km): Easy 5:25, Marathon 4:45, Threshold 4:26, Interval 4:00, with a 12-week build and race times. Reading: 7 min · Citations: 3 - 5/3/1 vs Smolov vs Sheiko: Which Plan Fits a Real Intermediate: https://aifithub.io/articles/five-three-one-vs-smolov-vs-sheiko-decision/ Description: Run 5/3/1, Smolov base, and Sheiko #29 on a 140kg-squat intermediate. The volume curves, the recovery cost, and the right call by training age. Reading: 8 min · Citations: 4 - Bench Press RPE 8 for 5 Reps: The Percentage Walkthrough: https://aifithub.io/articles/rpe-percentage-bench-press-rpe-8-five-reps/ Description: Bench press RPE 8 for 5 reps maps to 81.1% of 1RM on the RTS table. For a 140 kg bench 1RM that is 113.5 kg. The math and the velocity cross-check. Reading: 6 min · Citations: 3 - BMI vs FFMI vs Body Fat: A 178cm/80kg Male Through Three Lenses: https://aifithub.io/articles/bmi-vs-ffmi-vs-body-fat-178cm-male-80kg/ Description: Run BMI, FFMI, and Navy body-fat on the same 178cm/80kg male. Where the BMI overweight flag clashes with FFMI 22, and what to actually believe. Reading: 7 min · Citations: 4 - Calorie Deficit: 85 kg to 75 kg in 20 Weeks at 2200 TDEE: https://aifithub.io/articles/calorie-deficit-85kg-to-75kg-20-week-plan/ Description: Calorie deficit 550 kcal/day: eat 1650 kcal for an 85 kg adult at 2200 TDEE. Loss pace 0.5 kg/week, 25% deficit, 77000 kcal total cut over 20 weeks. Reading: 6 min · Citations: 3 - Concurrent Training Interference: 4 Lifts, 35km Running, 1 Rest Day: https://aifithub.io/articles/concurrent-training-4-lift-30km-run-interference/ Description: Concurrent training interference from 4 lifts + 35 km running: strength -16.3%, hypertrophy -21.5%, power -31.5%, plus the split rule that fixes it. Reading: 7 min · Citations: 3 - Cooper 12-Minute Test: 2400m for a 30-Year-Old Male: https://aifithub.io/articles/vo2-max-12-minute-cooper-2400m-male-30/ Description: Cooper test 2400 m in 12 min for a 30-year-old, 75 kg male: VO2max 42.4 ml/kg/min, classification Good. The formula, calibration, and protocol notes. Reading: 6 min · Citations: 3 - Creatine Loading vs Maintenance for an 82kg Lifter: https://aifithub.io/articles/creatine-loading-vs-maintenance-82kg-lifter/ Description: Creatine loading 24.6 g/day for 7 days then 3 g/day maintenance for an 82 kg lifter. 262 g per month, hydration baseline 2.87 L, math and trade-off. Reading: 6 min · Citations: 3 - Cycling FTP Zones: 250W at 75kg, 3.33 W/kg Walkthrough: https://aifithub.io/articles/cycling-ftp-zones-250w-75kg-rider/ Description: Cycling power zones for a 250W FTP / 75kg rider: 3.33 W/kg trained category, Z2 endurance 140-188W, Z4 threshold 228-263W, Z5 VO2max 265-300W. Reading: 7 min · Citations: 3 - Deload Protocols: When the Math Says Stop and When It Says Tweak: https://aifithub.io/articles/deload-protocols-pragmatism-vs-protocol-methodology/ Description: Deload protocols in the literature: fatigue-driven vs periodised, where Wendler's TM math meets Helms's autoregulation, and the empirical cost. Reading: 8 min · Citations: 4 - Detraining Decay: 4 Weeks Off for a 3-Year Trained Lifter: https://aifithub.io/articles/detraining-decay-4-weeks-off-3-year-trained/ Description: Detraining math: 150 kg 1RM after 4 weeks off for a 3-year trained lifter loses 2.9% to 145.7 kg. Retraining 2 weeks to peak, the decay curve, and gaps. Reading: 7 min · Citations: 3 - DOTS vs Strength Standards: Two Lenses for the Same Lifter: https://aifithub.io/articles/dots-vs-strength-standards-amateur-lifter/ Description: DOTS vs strength-standards engines for an 80kg/120-squat/80-bench/140-deadlift lifter. Where the two answers disagree and the reason behind the gap. Reading: 7 min · Citations: 4 - DOTS, Wilks, GL: An 83kg/510kg Male Lifter Scored Three Ways: https://aifithub.io/articles/dots-83kg-male-500kg-total-vs-equipped/ Description: DOTS 344.3, Wilks 340.7, IPF GL 70.6 for an 83 kg raw male lifter with a 510 kg total. The classification splits, why DOTS replaced Wilks, and what shifts. Reading: 7 min · Citations: 3 - Epley, Brzycki, Lombardi, Lander: A Methodology Deep-Dive on 1RM Math: https://aifithub.io/articles/epley-brzycki-lombardi-lander-1rm-methodology/ Description: Epley, Brzycki, Lombardi, and Lander 1RM formulas: where each comes from, how the constants were chosen, and where they break above eight reps. Reading: 8 min · Citations: 4 - Female Athlete Formula Suite: A 30-Year-Old in Regular Cycle: https://aifithub.io/articles/female-athlete-suite-30-yr-luteal-phase-case/ Description: Female athlete formulas for 65 kg, 168 cm, 24% body fat, regular cycle. The luteal-versus-follicular caloric drift and where male equations fail. Reading: 7 min · Citations: 4 - FFMI for the Intermediate Female Lifter: A 60kg/165cm/22% Walkthrough: https://aifithub.io/articles/ffmi-intermediate-female-lifter-case-study/ Description: FFMI for a 60kg, 165cm, 22% body-fat female intermediate lifter: adjusted 18.10 walkthrough, percentile context, and why the Kouri 25 cap was male-only. Reading: 7 min · Citations: 3 - From a 40-Minute 10K to a Half Marathon: A Riegel Walkthrough: https://aifithub.io/articles/race-time-predictor-track-10k-to-half-marathon/ Description: Forty-minute 10K via Riegel predicts 1:28:15 for the half marathon and 3:04:00 for the marathon. The 1.06 exponent, where it holds, where it lies. Reading: 6 min · Citations: 3 - Heart-Rate Zones vs Zone 2 Tools: Two Maps of the Same Effort: https://aifithub.io/articles/heart-rate-zones-vs-zone-2-decision-frame/ Description: Heart-rate five-zone vs dedicated Z2 engines for a 30/55bpm athlete. The percentage-of-MHR versus Karvonen split, the Maffetone line, the real Z2. Reading: 7 min · Citations: 4 - HRV Deload Trigger: A 7-Day Decline from Baseline 56 to Mean 50: https://aifithub.io/articles/hrv-deload-trigger-trend-decline-case/ Description: HRV trend 55, 57, 52, 48, 46, 47, 45 against baseline 56 (SD 4.2). Rolling deviation -10.7%, five days below SWC, deload recommendation: yes. The math. Reading: 7 min · Citations: 3 - Hybrid Training Plan: 30km Running, 70/20/10 Intensity, Three Lifts: https://aifithub.io/articles/hybrid-training-30km-easy-tempo-mix-3-lifts/ Description: Hybrid training math for 30 km/week running (70% easy, 20% tempo, 10% interval) plus three lifts. Session map, recovery debt, realistic goal window. Reading: 7 min · Citations: 3 - Ideal Weight vs BMI vs FFMI for a 178cm Male: Three Failure Modes: https://aifithub.io/articles/ideal-weight-vs-bmi-vs-ffmi-178cm-male/ Description: Ideal weight, BMI, and FFMI engines give three target weights for the same 178cm male. Where Devine breaks, where BMI breaks, where FFMI replaces both. Reading: 7 min · Citations: 4 - Junk Volume Detector: A 3-Week Stalling Squat Log: https://aifithub.io/articles/junk-volume-detector-squat-log-stagnation/ Description: Junk volume read of a 3-week squat log progressing from 100 to 103 kg: 0% junk sets, all 9 sets effective. Volume load delta drops from 2.5% to 0.5%. Reading: 7 min · Citations: 3 - LBM, FFMI, and Body Fat: A Decision Tree for Body Composition: https://aifithub.io/articles/lbm-vs-ffmi-vs-body-fat-decision-tree/ Description: Run LBM, FFMI, and Navy body-fat for an 80kg male. Which output to anchor during a recomp, which during a bulk, and where measurement error wins out. Reading: 7 min · Citations: 4 - Macro Cycling for an 80kg Male Recomp at 2500 kcal TDEE: https://aifithub.io/articles/macro-cycling-cutting-male-recomp-2500-tdee/ Description: Macro cycling for an 80 kg male recomp: 2600 kcal training days, 2200 kcal rest. Protein 131 g flat, carbs 239-375 g, fats 64-80 g counter-cycle. Reading: 7 min · Citations: 3 - Marathon Pace on a Net-Downhill Course: A Boston-Style Walkthrough: https://aifithub.io/articles/marathon-pace-elevation-net-downhill-boston-case/ Description: Marathon pace math for a Boston-style profile: 145m gain, 290m loss, 200-minute target. The 4:44/km flat-equivalent split and where the model breaks. Reading: 7 min · Citations: 3 - Marathon Sweat Rate: 70kg Runner, 2% Body Mass Loss in Warm Conditions: https://aifithub.io/articles/sweat-rate-marathon-warm-2-percent-loss/ Description: Marathon sweat rate 0.57 L/h, total loss 2.3 L over a 4-hour temperate race. Body mass loss 2.1%, 460 ml/h fluid plan, 529 mg/h sodium target. Reading: 7 min · Citations: 3 - Marathon Taper from 90 km Peak: A 2-Week Volume Reduction Plan: https://aifithub.io/articles/race-week-taper-marathon-80km-peak-volume/ Description: Marathon taper from 90 km peak volume: week minus 2 holds 90 km (40.5 km long), week minus 1 drops 60% to 36 km. Intensity 90%, frequency cut 20%. Reading: 6 min · Citations: 3 - Meet-Day Attempt Selection for a 300kg-Total Lifter at Moderate Confidence: https://aifithub.io/articles/meet-day-attempt-selection-300kg-total-male/ Description: Meet-day attempt math for 140 squat, 100 bench, 180 deadlift at moderate confidence. The opener spread, third-attempt risk, and day-of revision rule. Reading: 7 min · Citations: 3 - Mifflin, Harris-Benedict, Cunningham: Resting Metabolism Methodology: https://aifithub.io/articles/mifflin-harris-benedict-cunningham-rmr-methodology/ Description: Mifflin, Harris-Benedict, and Cunningham RMR equations: how each was derived, who the calibration cohort was, and the 5% Harris-Benedict overestimate. Reading: 8 min · Citations: 4 - Muscle Gain Potential: A 178cm Narrow-Frame Male Case: https://aifithub.io/articles/muscle-gain-potential-narrow-frame-male-case/ Description: Muscle gain ceiling 80.3 kg for a 178 cm, 17.5 wrist / 22 ankle male. 16.3 kg remaining, 79.7% of potential reached, ~3 years to ceiling. Casey Butt math. Reading: 7 min · Citations: 3 - Polarized, Pyramidal, and Threshold Training: The Distribution Argument: https://aifithub.io/articles/polarized-vs-pyramidal-vs-threshold-methodology/ Description: The 80/20 polarized model versus pyramidal and threshold distributions. Seiler 2010, Stoggl Sperlich 2014, and where Casado pyramidal data lands. Reading: 8 min · Citations: 4 - Protein Intake vs Macro Calculators: Three Engines, One Lifter: https://aifithub.io/articles/protein-intake-vs-macro-calculators-cross-check/ Description: Run protein-intake, macro, and macro-cycling tools on the same 80kg active lifter. The 1.6 g/kg ISSN floor, the bulk vs cut adjustment, the agreements. Reading: 7 min · Citations: 4 - Riegel vs VDOT: Half-Marathon Time From a 40-Minute 10K: https://aifithub.io/articles/riegel-vs-vdot-half-marathon-from-10k/ Description: Project a half-marathon from a 40-flat 10K with Riegel and Daniels VDOT side by side. The 90-second spread, the lactate-threshold assumption, the truth. Reading: 7 min · Citations: 4 - Running Pace vs Marathon Pace-Elevation: Flat vs Hilly Targets: https://aifithub.io/articles/running-pace-vs-marathon-pace-elevation-flat/ Description: Run pace tools head-to-head for a 4:00 marathon target. The flat-pace baseline, the Boston-profile delta, and the workout-pace adjustment that holds. Reading: 7 min · Citations: 4 - Schoenfeld Volume Meta-Analyses and the Junk-Set Question: https://aifithub.io/articles/schoenfeld-volume-meta-junk-set-methodology/ Description: Schoenfeld 2017 dose-response meta and 2019 high-volume trial: what each showed, where junk sets begin, and the diminishing-returns slope for trained men. Reading: 9 min · Citations: 4 - Sleep Debt, HRV, and Sleep Calculator: Cross-Checking Recovery Signals: https://aifithub.io/articles/sleep-debt-vs-hrv-vs-sleep-calc-cross-check/ Description: Same week, three engines: sleep debt, HRV trend, sleep-calculator wake time. Where the signals agree, where they conflict, and which one to trust. Reading: 8 min · Citations: 4 - Smolov Base Cycle for a 150 kg Squat: 4-Week Walkthrough: https://aifithub.io/articles/smolov-base-cycle-150kg-squat-walkthrough/ Description: Smolov Base mesocycle for a 150 kg squat: weekly volume 136 reps, 4 sessions per week, weights from 105 kg to 135 kg. Week-by-week loading and the cap. Reading: 8 min · Citations: 3 - TDEE for a Sedentary Office Worker vs a Warehouse Picker: https://aifithub.io/articles/tdee-sedentary-office-worker-vs-warehouse-case/ Description: TDEE gap for two 32-year-old 80kg/180cm men: same BMR 1770, different activity multipliers, and the roughly 700 kcal occupational difference. Reading: 7 min · Citations: 3 - TDEE vs BMR vs Calories Burned: Which Number Drives Your Plan: https://aifithub.io/articles/tdee-vs-bmr-vs-calories-burned-decision-frame/ Description: Run TDEE, BMR, and an activity-specific calories-burned figure for the same 78kg male. Which output anchors a cut, a bulk, and which is a distraction. Reading: 7 min · Citations: 4 - The Minetti Curve: Why Downhill Running Is Cheap Then Brutal: https://aifithub.io/articles/minetti-energy-cost-uphill-downhill-methodology/ Description: How Minetti's 2002 J Appl Physiol paper defines energy cost across grades, where the eccentric load tax dominates, and the practical pacing rule. Reading: 8 min · Citations: 4 - Velocity-Based 1RM: 180 kg Squat at 0.50 m/s in Practice: https://aifithub.io/articles/velocity-based-1rm-squat-half-meter-second/ Description: Velocity-based 1RM math: 180 kg squat at 0.50 m/s estimates 233.2 kg (95% CI 221.5-244.8). The strength-speed zone read and where bar speed lies. Reading: 7 min · Citations: 3 - VO2 Max Field Tests Compared: Cooper, Rockport, and Step Test: https://aifithub.io/articles/vo2-cooper-vs-rockport-vs-step-test-comparison/ Description: Same 30-year-old male through three field VO2 estimates. The Cooper run, the Rockport walk, and the YMCA step test side by side with the same person. Reading: 8 min · Citations: 4 - Walking, Treadmill, and Activity Engines: Where 300 kcal Hides: https://aifithub.io/articles/walking-vs-treadmill-vs-calories-burned-300kcal/ Description: Run the walking, treadmill, and generic calories-burned engines for a 45-minute session at 75kg. The MET assumptions, the incline math, the agreement. Reading: 7 min · Citations: 4 - Wendler 5/3/1 at TM 90%: A Cycle Walkthrough for a 420kg Total Lifter: https://aifithub.io/articles/wendler-531-tm-90-cycle-walkthrough-300kg-total/ Description: Wendler 5/3/1 at 90% training max: squat 140, bench 100, deadlift 180, OHP 60. Week 1 to deload weights, AMRAP targets, and progression logic. Reading: 8 min · Citations: 3 - Where a 140kg Squat Puts an 80kg Male in the Strength Distribution: https://aifithub.io/articles/strength-percentile-squat-140kg-80kg-male/ Description: Engine output for an 80kg male squatting 140kg single. The percentile rank, the StrengthLevel dataset context, and where age curves take over. Reading: 6 min · Citations: 4 - Wilks to IPF-GL to DOTS: The Coefficient Evolution Story: https://aifithub.io/articles/wilks-to-dots-coefficient-evolution-methodology/ Description: Why the IPF dropped Wilks in 2019, what the GL fit corrected, and why DOTS-style scoring is now the OpenPowerlifting default for raw lifters. Reading: 8 min · Citations: 4 - Zone 2 Heart Rate for a 30-Year-Old, RHR 50: Four Methods Compared: https://aifithub.io/articles/zone-2-hr-30-year-old-rhr-50-endurance-base/ Description: Zone 2 HR for a 30-year-old endurance athlete with resting heart rate 50 bpm: Karvonen 134-148, Maffetone 140-150, percentage 114-133, lactate 125-141. Reading: 7 min · Citations: 3 - Mobility Assessment: How to Test and Improve It: https://aifithub.io/articles/how-to-assess-and-improve-mobility/ Description: What mobility tests like sit-and-reach and the Functional Movement Screen actually measure, plus the stretching dose-response and a 6-week ROM protocol. Reading: 10 min · Citations: 6 - How to Run a Mini Cut: https://aifithub.io/articles/how-to-do-a-mini-cut/ Description: Run a mini-cut: the 4-6 week deficit window, weekly weight-loss target, training-volume scaling, and re-feed criteria to avoid muscle loss. Reading: 7 min · Citations: 4 - How to Structure a Powerlifting Meet Day: https://aifithub.io/articles/how-to-structure-a-powerlifting-meet/ Description: Powerlifting meet structure: opener / second / third attempt selection math, warm-up timing, equipment rules, and the day-of decisions that win meets. Reading: 8 min · Citations: 4 - How to Measure Body Fat at Home: https://aifithub.io/articles/how-to-measure-body-fat-at-home/ Description: Measure body fat at home: skinfold calipers, bioelectrical impedance, Navy method, and DEXA reality-check — accuracy, error bands, and method choice. Reading: 7 min · Citations: 4 - TDEE for Athletes: Why Formulas Understate You: https://aifithub.io/articles/tdee-for-athletes/ Description: TDEE for athletes: why standard equations under-predict for hybrid and endurance training. Activity-factor adjustments and exercise-energy add-ons. Reading: 7 min · Citations: 5 - How to Use Heart Rate Zones: https://aifithub.io/articles/how-to-use-heart-rate-zones/ Description: Heart-rate zones: which method (Karvonen, %HRmax, lactate threshold) for which goal, and how to set zone boundaries when you don't have a lab test. Reading: 7 min · Citations: 5 - How to Plan a Deload Week: https://aifithub.io/articles/how-to-plan-a-deload-week/ Description: Deload week planning: when to take one (set/rep stagnation, RPE drift, sleep markers), how to scale volume vs intensity, and what to monitor on return. Reading: 7 min · Citations: 4 - How to Use RPE for Training: https://aifithub.io/articles/how-to-use-rpe-for-training/ Description: The 1–10 RPE scale, reps-in-reserve framing, and how to anchor percentages to a moving 1RM instead of a stale one. Reading: 7 min · Citations: 4 - How to Estimate a 1RM Without Testing for One: https://aifithub.io/articles/how-to-calculate-one-rep-max-safely/ Description: Estimate a 1RM without testing: Epley, Brzycki, Lombardi, O'Conner, Wathan, and Mayhew — error bands, rep-range fit, and safety. Reading: 7 min · Citations: 4 - How to Train for a 5k: https://aifithub.io/articles/how-to-train-for-a-5k/ Description: A ten-week plan built around polarised training, aerobic base work, and a weekly VO2 max session — with pacing pulled from Riegel. Reading: 8 min · Citations: 5 - How to Improve Sleep for Recovery: https://aifithub.io/articles/how-to-improve-sleep-for-recovery/ Description: Improve sleep for recovery: stage architecture, evening blue-light load, caffeine half-life, sleep-restriction, and what actually moves HRV the next day. Reading: 7 min · Citations: 5 - How to Build Muscle as a Beginner: https://aifithub.io/articles/how-to-build-muscle-as-a-beginner/ Description: Building muscle as a beginner: the first-12-month volume / intensity / nutrition prescription — what the meta-analyses agree on for new lifters. Reading: 8 min · Citations: 5 - How to Improve VO2 Max: https://aifithub.io/articles/how-to-improve-vo2-max/ Description: VO2 max improvement: the four interventions with the largest meta-analytic effect — interval volume, threshold work, training age, and altitude exposure. Reading: 7 min · Citations: 5 - How to Eat Enough Protein: https://aifithub.io/articles/how-to-eat-enough-protein/ Description: Eating enough protein: the daily target by training goal, leucine threshold per meal, distribution across the day, and plant-based bioavailability adjustments. Reading: 7 min · Citations: 5 - How to Count Macros: https://aifithub.io/articles/how-to-count-macros/ Description: Counting macros: protein, carbs, and fat targets by training goal, meal-by-meal practical splits, and the tracking-app pitfalls that bias intake low. Reading: 7 min · Citations: 4 - How to Break a Weight-Loss Plateau: https://aifithub.io/articles/how-to-break-a-weight-loss-plateau/ Description: Breaking a weight-loss plateau: adaptive thermogenesis math, refeed protocols, training-volume changes, and the four leverage points before changing tools. Reading: 8 min · Citations: 5 ## Resources (247 total) ### Guides (43) - How to Break a Calorie Deficit Plateau (5 Fixes): https://aifithub.io/guides/how-to-break-a-calorie-deficit-plateau/ Description: How to break a calorie deficit Plateau (5 Fixes): weight loss stalled? Before cutting more calories, check these 5 common causes: tracking errors, metabolic a. Updated: 2026-04-02 - How to Calculate Macros for Bulking: A Complete Guide: https://aifithub.io/guides/how-to-calculate-macros-for-bulking/ Description: Calculate the right protein, carbs, and fat split for a lean bulk. Learn why a 200-300 calorie surplus is optimal, how much protein you actually need. Updated: 2026-04-02 - How to Measure Body Fat at Home: 4 Methods Compared: https://aifithub.io/guides/how-to-measure-body-fat-at-home/ Description: How to measure body fat at home: the Navy tape method, a smart scale, skinfold calipers or a visual estimate, the error each carries and which to repeat. Updated: 2026-04-02 - How to Use Your One-Rep Max for Training Programming: https://aifithub.io/guides/how-to-use-one-rep-max-for-programming/ Description: How to use your One-Rep max for training Programming: turn your estimated 1RM into practical training weights. 1RM. Updated: 2026-04-02 - Intermittent Fasting for Beginners: How to Start: https://aifithub.io/guides/intermittent-fasting-for-beginners/ Description: A practical beginner's guide to intermittent fasting: which protocol to start with, how to handle hunger, what the research actually shows, and who should. Updated: 2026-04-02 - Protein Timing: What the Research Actually Shows: https://aifithub.io/guides/protein-timing-myth-vs-reality/ Description: Does the 'anabolic window' exist? Is protein timing important for muscle growth? We reviewed the meta-analyses. Here's what actually matters. Updated: 2026-04-02 - TDEE for Athletes: Why Standard Calculators Underestimate: https://aifithub.io/guides/tdee-for-athletes/ Description: Standard TDEE calculators often underestimate energy needs for athletes by 300-800 kcal. Learn how to adjust for high training volume, periodized. Updated: 2026-04-02 - Why Your TDEE Drops When You Diet (And What to Do About It): https://aifithub.io/guides/why-your-tdee-drops-when-you-diet/ Description: Metabolic adaptation reduces your TDEE by 5-15% beyond weight loss alone. Learn why it happens, how to detect it, and 4 evidence-based strategies to fight back. Updated: 2026-04-02 - How to Avoid Overtraining: https://aifithub.io/guides/how-to-avoid-overtraining/ Description: How to avoid Overtraining: apply techniques to prevent overtraining syndrome, enhance recovery, and optimize performance. Updated: 2026-03-27 - How to Break a Weight Loss Plateau: https://aifithub.io/guides/how-to-break-a-weight-loss-plateau/ Description: How to break a weight loss Plateau: bust through stubborn weight loss plateaus with expert strategies. Updated: 2026-03-27 - How to Build a Home Workout Routine: https://aifithub.io/guides/how-to-build-a-home-workout-routine/ Description: Build a home workout routine step by step: set goals, pick bodyweight and band exercises, structure your weekly split, and apply progressive overload. Updated: 2026-03-27 - How to Build a Strength Program from Scratch: https://aifithub.io/guides/how-to-build-a-strength-program/ Description: How to build a strength Program from Scratch: design your personalized strength training program from the ground up. Updated: 2026-03-27 - How to Build Grip Strength: https://aifithub.io/guides/how-to-build-grip-strength/ Description: How to build Grip strength: strengthen your grip with expert techniques, specific exercises, and progressive overload strategies. Updated: 2026-03-27 - How to Build Muscle as a Beginner: https://aifithub.io/guides/how-to-build-muscle-as-a-beginner/ Description: How to build muscle as a beginner: set calories and protein for growth, learn the compound lifts, add load progressively, sleep enough and track it weekly. Updated: 2026-03-27 - How to Calculate Macros for Cutting: https://aifithub.io/guides/how-to-calculate-macros-for-cutting/ Description: How to calculate macros for Cutting: determine your precise macronutrient targets for effective fat loss. Updated: 2026-03-27 - How to Calculate Your Ideal Weight: https://aifithub.io/guides/how-to-calculate-ideal-weight/ Description: How to calculate your ideal weight using BMI, the Devine formula, body fat percentage, and waist-to-height ratio, plus why a healthy range beats one number. Updated: 2026-03-27 - How to Calculate Your One Rep Max: https://aifithub.io/guides/how-to-calculate-one-rep-max/ Description: How to calculate your one rep max: accurately determine your maximum lifting potential for any exercise using expert-backed direct and indirect methods. Updated: 2026-03-27 - How to Calculate Your TDEE for Any Fitness Goal: https://aifithub.io/guides/how-to-calculate-your-tdee/ Description: Calculate your TDEE using 4 research-backed formulas. Learn which formula is most accurate for your body, why most people overestimate activity level. Updated: 2026-04-02 - How to Count Macros: A Beginner's Guide: https://aifithub.io/guides/how-to-count-macros/ Description: Get precision nutrition by learning how to count macros. This guide provides step-by-step instructions, formulas, and expert tips to align your diet. Updated: 2026-03-27 - How to Do a Body Recomposition: https://aifithub.io/guides/how-to-body-recomposition/ Description: How to body recomp: build muscle and lose fat at the same time. Macro targets, training structure, recovery rules, and the realistic timeline expectations. Updated: 2026-03-27 - How to Do a Mini Cut: https://aifithub.io/guides/how-to-do-a-mini-cut/ Description: Accelerate fat loss with a strategic mini cut. Learn to set an aggressive calorie deficit, prioritize protein, and preserve muscle for rapid, effective results. Updated: 2026-03-27 - How to Eat Enough Protein Every Day: https://aifithub.io/guides/how-to-eat-enough-protein/ Description: How to eat Enough protein Every Day: optimize your daily protein intake with expert strategies, specific calculations, and practical meal planning tips to sup. Updated: 2026-03-27 - How to Eat for Recovery After Training: https://aifithub.io/guides/how-to-eat-for-recovery/ Description: How to eat for recovery After training: optimize your post-workout nutrition with expert strategies. Updated: 2026-03-27 - How to Improve Mobility for Better Lifts: https://aifithub.io/guides/how-to-improve-mobility/ Description: How to improve mobility for bigger lifts. Targeted drills and corrective work to expand range of motion, prevent injury, and add kilos to squat and press. Updated: 2026-03-27 - How to Improve Sleep for Better Recovery: https://aifithub.io/guides/how-to-improve-sleep-for-recovery/ Description: How to improve sleep for Better recovery: optimize your sleep habits for enhanced physical and mental recovery. Updated: 2026-03-27 - How to Improve Your VO2 Max: https://aifithub.io/guides/how-to-improve-vo2-max/ Description: How to improve your VO2 max: boost your running performance and endurance by implementing expert-designed VO2 max training strategies. Updated: 2026-03-27 - How to Manage Training Stress: https://aifithub.io/guides/how-to-manage-training-stress/ Description: How to manage training Stress: optimize your recovery and performance by mastering training stress management. Updated: 2026-03-27 - How to Meal Prep for the Week: https://aifithub.io/guides/how-to-meal-prep-for-the-week/ Description: How to Meal Prep for the Week: simplify your nutrition with expert strategies for weekly meal prep. Updated: 2026-03-27 - How to Plan a Deload Week: https://aifithub.io/guides/how-to-plan-a-deload-week/ Description: How to plan a Deload Week: optimize your training gains and prevent burnout by strategically implementing a deload week. Updated: 2026-03-27 - How to Prevent Common Training Injuries: https://aifithub.io/guides/how-to-prevent-common-injuries/ Description: How to prevent Common training Injuries: implement expert strategies to proactively avoid common training injuries. Updated: 2026-03-27 - How to Progressive Overload Properly: https://aifithub.io/guides/how-to-progressive-overload/ Description: Apply progressive overload for consistent strength gains. Learn specific techniques like increasing weight, reps, and optimizing recovery with expert guidance. Updated: 2026-03-27 - How to Start a Calorie Deficit: https://aifithub.io/guides/how-to-start-a-calorie-deficit/ Description: How to start a calorie deficit: initiate a calorie deficit effectively for sustainable weight loss. Updated: 2026-03-27 - How to Start Intermittent Fasting Safely: https://aifithub.io/guides/how-to-start-intermittent-fasting/ Description: How to start Intermittent fasting Safely: begin intermittent fasting safely with expert guidance. Updated: 2026-03-27 - How to Stay Hydrated During Exercise: https://aifithub.io/guides/how-to-stay-hydrated-during-exercise/ Description: How to stay Hydrated During Exercise: optimize your performance and prevent dehydration during workouts with expert strategies, personalized fluid intake guid. Updated: 2026-03-27 - How to Stretch Properly: Dynamic vs Static, Hold Times: https://aifithub.io/guides/how-to-stretch-properly/ Description: How to stretch properly: 5–10 minutes of dynamic moves before activity, static holds of 20–30 seconds for 2–3 reps after, no bouncing, 3–5 times a week. Updated: 2026-03-27 - How to Track Body Fat Accurately: https://aifithub.io/guides/how-to-track-body-fat/ Description: How to track body fat reliably. Standardize tape and caliper measurements, time them right, and turn the data into real body composition progress. Updated: 2026-03-27 - How to Track Workout Progress Effectively: https://aifithub.io/guides/how-to-track-workout-progress/ Description: Track workout progress effectively for strength gains. Learn specific metrics, data analysis, and expert strategies to consistently advance your training. Updated: 2026-03-27 - How to Train at Home Without Equipment: https://aifithub.io/guides/how-to-train-at-home-without-equipment/ Description: Rebuild your training at home without equipment. Master bodyweight exercises, implement progressive overload, and structure effective workouts for real. Updated: 2026-03-27 - How to Train for a 5K: https://aifithub.io/guides/how-to-train-for-a-5k/ Description: Train for a 5K with this expert guide. Learn to build endurance, boost speed, and prevent injuries for your best race day performance. Updated: 2026-03-27 - How to Use Creatine: Dosing and Timing: https://aifithub.io/guides/how-to-use-creatine/ Description: Optimize your creatine intake for peak performance and muscle growth. Discover precise loading, maintenance, and timing strategies backed by science. Updated: 2026-03-27 - How to Use Heart Rate Zones for Training: https://aifithub.io/guides/how-to-use-heart-rate-zones/ Description: How to use heart rate zones for running: find your max heart rate, set the five training zones, and match each run to the right intensity for results. Updated: 2026-03-27 - How to Use RPE for Training: https://aifithub.io/guides/how-to-use-rpe-for-training/ Description: Use RPE in training to compound strength gains. Learn to autoregulate your workouts, prevent overtraining, and make consistent progress with expert strategies. Updated: 2026-03-27 - How to Warm Up for Deadlifts: https://aifithub.io/guides/how-to-warm-up-for-deadlifts/ Description: How to warm up for Deadlifts: optimize your deadlift performance and prevent injury with a structured, science-backed warm-up routine. Updated: 2026-03-27 ### Checklists (25) - TDEE Tracking Checklist: Your First 30 Days: https://aifithub.io/checklists/tdee-tracking-checklist/ Description: A week-by-week checklist for calibrating your TDEE estimate with real-world data. Covers measurement, tracking, and adjustment over 4 weeks. Updated: 2026-04-02 - 5K Training Checklist: https://aifithub.io/checklists/5k-training-checklist/ Description: Ace your 5K with this training checklist! From planning and gear checks to detailed workout execution, nutrition, recovery, and race day strategies. Updated: 2026-03-27 - Body Recomposition Checklist: https://aifithub.io/checklists/body-recomp-checklist/ Description: Plan body recomposition with this actionable checklist. Simultaneously build muscle and burn fat through precise nutrition, effective training. Updated: 2026-03-27 - Bulking Phase Checklist: https://aifithub.io/checklists/bulking-phase-checklist/ Description: Plan a structured bulking phase with this actionable checklist. Learn to optimize nutrition, training, and recovery for effective hypertrophy. Updated: 2026-03-27 - Cutting Phase Checklist: https://aifithub.io/checklists/cutting-phase-checklist/ Description: Run a structured cutting phase with this actionable checklist. Learn to set calorie deficits, optimize macros, adjust training, and track progress. Updated: 2026-03-27 - Daily Hydration Checklist: https://aifithub.io/checklists/hydration-checklist/ Description: Daily hydration checklist for athletes. Set fluid targets, drink on a schedule, monitor urine color, and stay ahead of training-day water and sodium needs. Updated: 2026-03-27 - Daily Mobility Routine Checklist: https://aifithub.io/checklists/mobility-routine-checklist/ Description: Build better movement with this daily mobility routine checklist. Improve flexibility, reduce stiffness, and enhance overall joint health in just minutes. Updated: 2026-03-27 - Deload Week Checklist: https://aifithub.io/checklists/deload-week-checklist/ Description: Run a structured deload week with this practical checklist. Learn to strategically reduce training stress, optimize recovery, and return stronger. Updated: 2026-03-27 - Gym Beginner Checklist: https://aifithub.io/checklists/gym-beginner-checklist/ Description: Gym Beginner checklist: start your strength training with confidence. This checklist guides gym beginners through planning, safety, form, and tracking for eff. Updated: 2026-03-27 - Home Gym Setup Checklist: https://aifithub.io/checklists/home-gym-setup-checklist/ Description: Build your ideal home gym with this checklist. Cover space planning, essential equipment, safety measures, and smart layouts for an effective workout space. Updated: 2026-03-27 - Injury Prevention Checklist: https://aifithub.io/checklists/injury-prevention-checklist/ Description: An injury prevention checklist for training: warm up, hold form under progressive load, cool down, schedule recovery weeks, and act on the warning signs early. Updated: 2026-03-27 - Intermittent Fasting Start Checklist: https://aifithub.io/checklists/fasting-start-checklist/ Description: Start an intermittent fasting plan with this actionable checklist. Prepare your body, plan your windows, and set yourself up for success with clear steps. Updated: 2026-03-27 - Marathon Training Checklist: 16–20 Weeks to Race Day: https://aifithub.io/checklists/marathon-training-checklist/ Description: A marathon training checklist from base to race day: a 16 to 20 week plan, long runs in race kit, fuel every 30 to 45 minutes, and a 2 to 3 week taper. Updated: 2026-03-27 - Post-Workout Recovery Checklist: https://aifithub.io/checklists/post-workout-recovery-checklist/ Description: Optimize your post-workout routine with this actionable checklist. Learn to refuel, repair muscles, and enhance performance for faster, more effective recovery. Updated: 2026-03-27 - Powerlifting Meet Day Checklist: https://aifithub.io/checklists/powerlifting-meet-checklist/ Description: Ensure a flawless powerlifting meet day with this actionable checklist. Cover essential gear, nutrition, warm-ups, and strategic attempt selection to hit. Updated: 2026-03-27 - Pre-Training Warm-Up Checklist: https://aifithub.io/checklists/warm-up-checklist/ Description: Maximize your workout safety and performance with our Pre-Training Warm-Up Checklist. Implement actionable steps, specific thresholds, and expert tips. Updated: 2026-03-27 - Pre-Workout Nutrition Checklist: https://aifithub.io/checklists/pre-workout-nutrition-checklist/ Description: Pre-workout Nutrition checklist: optimize your workout performance and recovery with this actionable pre-workout nutrition checklist. Updated: 2026-03-27 - Running Gear Checklist: https://aifithub.io/checklists/running-gear-checklist/ Description: Equip yourself for success with this essential running gear checklist from AI Fit Hub. Discover must-have apparel, tech, and safety items to enhance every run. Updated: 2026-03-27 - Sleep Hygiene Checklist: https://aifithub.io/checklists/sleep-hygiene-checklist/ Description: Optimize your sleep with this actionable checklist! Discover concrete steps to improve your sleep schedule, environment, and daily habits for deeper, more. Updated: 2026-03-27 - Strength Training Program Checklist: https://aifithub.io/checklists/strength-training-program-checklist/ Description: Build an effective strength training program with this actionable checklist. Define goals, structure workouts, implement progressive overload. Updated: 2026-03-27 - Stretching Checklist: Warm-Up, Hold Times & Weekly Plan: https://aifithub.io/checklists/stretching-routine-checklist/ Description: A stretching checklist to tick off: dynamic moves before you train, static holds of 20 to 30 seconds for 2 to 3 rounds after, in a 10 to 20 minute routine. Updated: 2026-03-27 - Supplement Stack Checklist: https://aifithub.io/checklists/supplement-stack-checklist/ Description: Build an effective and safe supplement stack with our actionable checklist. Optimize your fitness goals by assessing needs, selecting evidence-based. Updated: 2026-03-27 - Training Block Setup Checklist: https://aifithub.io/checklists/training-block-setup-checklist/ Description: Optimize your strength training with this actionable checklist for setting up effective training blocks. Plan progressive overload, manage volume. Updated: 2026-03-27 - Weekly Meal Prep Checklist: https://aifithub.io/checklists/meal-prep-weekly-checklist/ Description: Optimize your weekly nutrition with this actionable meal prep checklist. Plan, shop, prep, and store efficiently to hit your macro goals and save time. Updated: 2026-03-27 - Weight Loss Checklist: https://aifithub.io/checklists/weight-loss-checklist/ Description: Plan sustainable weight loss with this practical checklist from AI Fit Hub. Set realistic goals, optimize nutrition, and structure activity for lasting results. Updated: 2026-03-27 ### Comparisons (34) - 16:8 vs OMAD: Which Intermittent Fasting Protocol Is Better?: https://aifithub.io/compare/168-vs-omad-fasting/ Description: Compare 16:8 and OMAD fasting for fat loss, muscle retention, adherence, and health. Evidence-based analysis of when each protocol makes sense. Updated: 2026-04-02 - How Accurate Is the Navy Body Fat Calculator vs Calipers: https://aifithub.io/compare/navy-vs-caliper-body-fat/ Description: How accurate is the Navy body fat calculator? It reads within 3-4% of DEXA versus 2-3% for trained calipers. Navy wins on repeatability for solo tracking. Updated: 2026-04-02 - Is MyFitnessPal Accurate? TDEE Calculator vs MyFitnessPal: https://aifithub.io/compare/tdee-calculator-vs-myfitnesspal/ Description: Is MyFitnessPal accurate? Its built-in calorie goal can sit 200-400 off your real TDEE. A dedicated calculator sets the target; MFP logs against it. Updated: 2026-04-02 - Mifflin-St Jeor vs Harris-Benedict: Which Is More Accurate: https://aifithub.io/compare/mifflin-st-jeor-vs-harris-benedict/ Description: Mifflin-St Jeor vs Harris-Benedict: Mifflin is more accurate, within 10% of measured BMR for 82% of people vs 69% (ADA 2005 review). Harris runs ~5% high. Updated: 2026-04-02 - 5x5 vs Hypertrophy Program: https://aifithub.io/compare/5x5-vs-hypertrophy-program/ Description: Unsure whether 5x5 or a hypertrophy program is right for you? This balanced guide compares their pros, cons, and specific outcomes for muscle building. Updated: 2026-03-27 - BMI vs Body Fat Percentage: https://aifithub.io/compare/bmi-vs-body-fat-percentage/ Description: BMI vs body fat percentage: BMI is a weight-to-height ratio, body fat percentage measures adipose tissue directly. Pros, cons, and when each metric is most useful. Updated: 2026-03-27 - Calorie Counting vs Intuitive Eating Diet for Weight Loss: https://aifithub.io/compare/calorie-counting-vs-intuitive-eating/ Description: Calorie counting vs intuitive eating diet: counting gives faster fat loss, intuitive eating protects maintenance. See who each fits and how to combine both. Updated: 2026-06-15 - Compound vs Isolation Exercises: When Each Wins: https://aifithub.io/compare/compound-vs-isolation-exercises/ Description: Compound lifts build strength and burn more per session; isolation targets one muscle for shape and rehab. When each wins, plus how to program both. Updated: 2026-03-27 - Conventional vs Sumo Deadlift: https://aifithub.io/compare/conventional-vs-sumo-deadlift/ Description: Compare conventional and sumo deadlifts to find your optimal pulling stance. Analyze biomechanics, muscle activation, injury risk, and strength potential. Updated: 2026-03-27 - Creatine vs No Creatine: Benefits, Gains & Who Skips It: https://aifithub.io/compare/creatine-vs-no-creatine/ Description: Creatine vs no creatine: the strength and power gains it typically adds over 4 to 12 weeks, why some people barely respond, and who is better off without it. Updated: 2026-03-27 - Cutting vs Bulking: When to Do Each: https://aifithub.io/compare/cutting-vs-bulking/ Description: Unravel the 'cutting' vs 'bulking' debate to plan body composition changes. Learn when to strategically focus on fat loss or muscle gain for peak fitness. Updated: 2026-03-27 - Dumbbells vs Barbells: Which Builds More Muscle?: https://aifithub.io/compare/dumbbells-vs-barbells/ Description: Dumbbells vs barbells compared: how each affects muscle growth, progressive overload, stabilizer work, and fixing imbalances, so you pick the right tool. Updated: 2026-03-27 - Foam Rolling vs Stretching for Recovery: https://aifithub.io/compare/foam-rolling-vs-stretching/ Description: Foam rolling vs stretching for recovery: foam rolling targets myofascial release, stretching extends muscle length. Direct side-by-side with citations. Updated: 2026-03-27 - Free Weights vs Machines: https://aifithub.io/compare/free-weights-vs-machines/ Description: Unsure whether to lift free weights or use machines for strength training? Discover the pros, cons, and optimal uses for each to compound strength gains. Updated: 2026-03-27 - Full Body vs Split Routine: https://aifithub.io/compare/full-body-vs-split-routine/ Description: Full body vs Split Routine: decipher the best strength training approach for your goals: Full Body vs. Split Routine. Updated: 2026-03-27 - Gym vs Home Workouts: Cost, Gains and Convenience: https://aifithub.io/compare/gym-vs-home-workouts/ Description: Gym membership vs home workouts compared on annual cost, equipment, progressive overload, and convenience, with a clear verdict on which fits your goals. Updated: 2026-03-27 - High Bar vs Low Bar Squat: https://aifithub.io/compare/high-bar-vs-low-bar-squat/ Description: High bar vs low bar squat: bar position changes torso angle, hip vs knee drive, and quad vs posterior-chain emphasis. Mobility requirements and muscle focus compared. Updated: 2026-03-27 - HIIT vs LISS: Which Cardio Is Better?: https://aifithub.io/compare/hiit-vs-liss/ Description: HIIT vs LISS for weight loss and cardiovascular fitness: calorie burn per minute, EPOC effect, time efficiency, and adaptations compared with citations. Updated: 2026-03-27 - IIFYM vs Clean Eating: Which Wins for Fat Loss: https://aifithub.io/compare/iifym-vs-clean-eating/ Description: IIFYM tracks macros so any food fits; clean eating favors whole foods. Both cut fat at equal calories. Who each suits, vegan options, and how to combine them. Updated: 2026-03-27 - Intermittent Fasting vs Regular Meals: https://aifithub.io/compare/intermittent-fasting-vs-regular-meals/ Description: Intermittent fasting vs regular meals: metabolic effects, hunger pattern differences, adherence rates, and social fit compared with peer-reviewed data. Updated: 2026-03-27 - Linear vs Undulating Periodization: https://aifithub.io/compare/linear-vs-undulating-periodization/ Description: Linear vs Undulating Periodization: unravel the best periodization for your strength goals: Linear vs. Undulating. Updated: 2026-03-27 - Low Carb vs Low Fat for Weight Loss: https://aifithub.io/compare/low-carb-vs-low-fat/ Description: Compare low-carb and low-fat diets for weight loss. Discover their specific pros, cons, and which approach suits your metabolism and health goals. Updated: 2026-03-27 - Morning vs Evening Workouts: https://aifithub.io/compare/morning-vs-evening-workouts/ Description: Compare the pros and cons of morning vs. evening workouts for recovery, performance, and sleep. Find your ideal workout time with AI Fit Hub's balanced. Updated: 2026-03-27 - PPL vs Upper/Lower Split: https://aifithub.io/compare/ppl-vs-upper-lower-split/ Description: Deciding between PPL and Upper/Lower splits for strength training? Discover the pros, cons, and ideal scenarios for each to tune your gym routine. Updated: 2026-03-27 - Rest Days vs Active Recovery: https://aifithub.io/compare/rest-days-vs-active-recovery/ Description: Unsure whether to take a rest day or opt for active recovery? This guide compares both options to help you optimize muscle repair, reduce fatigue. Updated: 2026-03-27 - Running vs Walking for Weight Loss: https://aifithub.io/compare/running-vs-walking-for-weight-loss/ Description: Running vs walking for weight loss: side-by-side comparison of calorie burn, injury risk, and time efficiency to pick the right tool for your level. Updated: 2026-03-27 - Static vs Dynamic Stretching: When to Use Each: https://aifithub.io/compare/static-vs-dynamic-stretching/ Description: Compare static vs dynamic stretching. Learn when to use each for warm-ups, cool-downs, and injury prevention to support your training routine. Updated: 2026-03-27 - Strength vs Hypertrophy Training: https://aifithub.io/compare/strength-vs-hypertrophy-training/ Description: Compare strength vs hypertrophy training to understand their distinct benefits, methodologies, and how to choose the right path for your training goals. Updated: 2026-03-27 - Swimming vs Running for Fitness: https://aifithub.io/compare/swimming-vs-running/ Description: Compare swimming and running for fitness side-by-side. Uncover which cardio workout is best for joint health, calorie burn, muscle engagement, and overall. Updated: 2026-03-27 - Treadmill vs Outdoor Running: https://aifithub.io/compare/treadmill-vs-outdoor-running/ Description: Compare treadmill vs outdoor running for fitness, injury prevention, and performance. Discover the pros and cons of each, helping you choose the best. Updated: 2026-03-27 - Whey Isolate vs Concentrate: Which Protein to Buy: https://aifithub.io/compare/isolate-vs-concentrate-protein/ Description: Whey isolate vs concentrate: concentrate is 70-80% protein and cheaper; isolate is 90%+ and low-lactose. Buy concentrate unless you need the purity. Updated: 2026-03-27 - Whey vs Plant Protein: Which Builds Muscle Better?: https://aifithub.io/compare/whey-vs-plant-protein/ Description: Whey vs plant protein compared on leucine, absorption, digestion, and cost. Whey edges muscle synthesis gram-for-gram; pea-rice blends close the gap. Updated: 2026-03-27 - Yoga vs Stretching: What's the Difference?: https://aifithub.io/compare/yoga-vs-stretching/ Description: Unravel the core distinctions between yoga and stretching for flexibility and well-being. Discover which practice best suits your fitness goals. Updated: 2026-03-27 - Zone 2 vs Zone 5 Training: https://aifithub.io/compare/zone-2-vs-zone-5-training/ Description: Unpack the differences between Zone 2 and Zone 5 running training. Learn how balancing these heart rate zones builds endurance, speed, and prevents injury. Updated: 2026-03-27 ### Alternatives (3) - Garmin Alternatives for Running Watches (2026): https://aifithub.io/alternatives/garmin-alternatives-running-watch-2026/ Description: Garmin running-watch alternatives in 2026: COROS, Apple Watch, and Polar compared on GPS accuracy, battery, price, and who each watch fits. Updated: 2026-07-23 - Oura Ring Alternatives (2026): https://aifithub.io/alternatives/oura-ring-alternatives-2026/ Description: Oura Ring alternatives in 2026: the Ultrahuman Ring PRO, WHOOP, and Garmin compared on sleep accuracy, subscription cost, and who each tracker fits. Updated: 2026-07-23 - WHOOP Alternatives (2026): https://aifithub.io/alternatives/whoop-alternatives-2026/ Description: WHOOP alternatives in 2026: Oura Ring 4, Garmin, and Apple Watch compared on recovery accuracy, subscription cost, and who each tracker fits. Updated: 2026-07-23 ### Learn (35) - What Is Active Recovery? Simply Explained: https://aifithub.io/learn/active-recovery/ Description: Learn what active recovery is, how it accelerates muscle repair, reduces soreness, and improves performance. Discover practical examples and benefits. Updated: 2026-03-27 - What Is BMI? Simply Explained: https://aifithub.io/learn/bmi/ Description: Understand BMI (Body Mass Index): its definition, how it's calculated using height and weight, what your score means, and why it's a key health indicator. Updated: 2026-03-27 - What Is BMR? Simply Explained: https://aifithub.io/learn/bmr/ Description: Understand BMR (Basal Metabolic Rate), the minimum calories your body needs at rest. Learn how it impacts weight loss, how to calculate it, and why it's. Updated: 2026-03-27 - What Is Body Fat Percentage? Definition & How It's Measured: https://aifithub.io/learn/body-fat-percentage/ Description: Learn what body fat percentage means, how it's calculated, the methods used to measure it (DEXA, BIA, calipers), and why it beats weight or BMI for health. Updated: 2026-03-27 - What Is Calorie Deficit? Simply Explained: https://aifithub.io/learn/calorie-deficit/ Description: What is calorie deficit: understand effective weight loss with our clear explanation of 'Calorie Deficit'. Updated: 2026-03-27 - What Is Compound Sets? Simply Explained: https://aifithub.io/learn/compound-sets/ Description: Maximize muscle growth and workout efficiency with compound sets. Learn their precise definition, how they work, and why they're for your strength training. Updated: 2026-03-27 - What Is Creatine? Simply Explained: https://aifithub.io/learn/creatine/ Description: Discover creatine's role in muscle energy, performance enhancement, and brain health. Learn how it works, typical dosages, and its benefits for athletes. Updated: 2026-03-27 - What Is Deload? Simply Explained: https://aifithub.io/learn/deload/ Description: Deload definition: a planned, temporary reduction in training stress to boost recovery, prevent overtraining, and protect long-term strength and muscle. Updated: 2026-03-27 - What Is DOMS? Simply Explained: https://aifithub.io/learn/doms/ Description: Understand DOMS (Delayed Onset Muscle Soreness), the muscle pain felt after exercise. Learn its causes, how it works, and effective recovery strategies. Updated: 2026-03-27 - What Is Eccentric Training? Simply Explained: https://aifithub.io/learn/eccentric-training/ Description: Learn what eccentric training is, the 'negative' phase of lifting, and how it dramatically boosts muscle growth, strength, and injury resilience. Discover. Updated: 2026-03-27 - What Is FFMI? Simply Explained: https://aifithub.io/learn/ffmi/ Description: Learn what FFMI (Fat-Free Mass Index) is, how to calculate it, and why this metric is important for assessing muscularity relative to height and body fat. Updated: 2026-03-27 - What Is Glycogen? Simply Explained: https://aifithub.io/learn/glycogen/ Description: Understand glycogen's role as the body's primary stored carbohydrate, fueling muscles and brain. Learn how it's formed, used, and impacts energy. Updated: 2026-03-27 - What Is HIIT? Simply Explained: https://aifithub.io/learn/hiit/ Description: Discover HIIT (High-Intensity Interval Training): short bursts of intense exercise followed by brief recovery for maximum fat burning and fitness. Updated: 2026-03-27 - What Is Hypertrophy? Simply Explained: https://aifithub.io/learn/hypertrophy/ Description: What is hypertrophy: understand the science of muscle growth with our complete guide to hypertrophy. Updated: 2026-03-27 - What Is Lactate Threshold? Meaning, Testing & Training: https://aifithub.io/learn/lactate-threshold/ Description: What lactate threshold means, why it sets the fastest pace you can hold, how to estimate it with a 30-minute field test, and how to train to raise it. Updated: 2026-03-27 - What Is Lean Body Mass? Simply Explained: https://aifithub.io/learn/lean-body-mass/ Description: Understand Lean Body Mass: its definition, why it matters for health and fitness, how to calculate it, and its impact on metabolism and body composition goals. Updated: 2026-03-27 - What Is Macros? Simply Explained: https://aifithub.io/learn/macros/ Description: Understand macros (macronutrients): carbohydrates, proteins, and fats. Learn how these essential nutrients power the body, impact health, and support. Updated: 2026-03-27 - What Is Maximal Heart Rate (MHR)? Formula & Zones: https://aifithub.io/learn/maximal-heart-rate/ Description: Maximal heart rate is the most beats per minute your heart reaches at all-out effort. 220 minus age gives a rough estimate; your training zones follow from it. Updated: 2026-03-27 - What Is Metabolic Rate? Simply Explained: https://aifithub.io/learn/metabolic-rate/ Description: Discover what metabolic rate is, how it's calculated using BMR, and its critical role in effective weight loss. Learn to manage energy expenditure. Updated: 2026-03-27 - What Is Mobility? Simply Explained: https://aifithub.io/learn/mobility/ Description: Discover the true meaning of mobility in fitness. Learn how active joint control and strength enhance movement, prevent injury, and boost performance. Updated: 2026-03-27 - What Is Muscle Protein Synthesis? Simply Explained: https://aifithub.io/learn/muscle-protein-synthesis/ Description: Understand Muscle Protein Synthesis (MPS), the process for muscle growth and repair. Learn how exercise and diet stimulate MPS for optimal gains. AI Fit. Updated: 2026-03-27 - What Is Myofibrillar Hypertrophy? Simply Explained: https://aifithub.io/learn/myofibrillar-hypertrophy/ Description: Unpack myofibrillar hypertrophy – the key to strength gains. Learn how increased contractile proteins build denser, more powerful muscles. AI Fit Hub. Updated: 2026-03-27 - What Is One Rep Max? Simply Explained: https://aifithub.io/learn/one-rep-max/ Description: Estimate your strength range. Learn what One Rep Max (1RM) is, how to calculate it, and why it's important for effective strength training and progress. Updated: 2026-03-27 - What Is Periodization? Simply Explained: https://aifithub.io/learn/periodization/ Description: Plan strength training with periodization. Learn how to strategically vary your workouts to optimize gains, prevent plateaus, and reduce injury risk. Updated: 2026-03-27 - What Is Progressive Overload? Simply Explained: https://aifithub.io/learn/progressive-overload/ Description: Build consistent strength gains with Progressive Overload. Learn how to gradually increase demands on your muscles for continuous adaptation and growth. Updated: 2026-03-27 - What Is Range of Motion? Simply Explained: https://aifithub.io/learn/range-of-motion/ Description: Discover what Range of Motion (ROM) is, why it's important for flexibility, injury prevention, and athletic performance. Learn how ROM is measured. Updated: 2026-03-27 - What Is Rest-Pause Training? Simply Explained: https://aifithub.io/learn/rest-pause-training/ Description: Discover Rest-Pause Training: an advanced muscle-building technique to maximize hypertrophy. Learn how short intra-set rests boost volume and intensity. Updated: 2026-03-27 - What Is Reverse Dieting? Simply Explained: https://aifithub.io/learn/reverse-dieting/ Description: Learn about reverse dieting, a strategic process of gradually increasing calorie intake after a weight loss phase to restore metabolic function. Updated: 2026-03-27 - What Is RPE? Simply Explained: https://aifithub.io/learn/rpe/ Description: Calibrate workout intensity with RPE (Rate of Perceived Exertion). Learn how this scale guides workout intensity and supports consistent progress. Updated: 2026-03-27 - What Is TDEE? Total Daily Energy Expenditure Explained: https://aifithub.io/learn/tdee/ Description: TDEE is the total calories your body burns in 24 hours — BMR + activity + digestion. Learn its 4 components, how to calculate it, and why it's. Updated: 2026-04-02 - What Is Tempo Training? Simply Explained: https://aifithub.io/learn/tempo-training/ Description: Build muscle growth and strength gains with Tempo Training. Learn how controlling movement speed enhances hypertrophy, technique, and injury prevention. Updated: 2026-03-27 - What Is Thermic Effect of Food? Simply Explained: https://aifithub.io/learn/thermic-effect-of-food/ Description: Understand the Thermic Effect of Food (TEF): the energy your body uses to digest, absorb, and process nutrients. Learn how TEF impacts metabolism. Updated: 2026-03-27 - What Is Time Under Tension? Simply Explained: https://aifithub.io/learn/time-under-tension/ Description: Optimize muscle growth with Time Under Tension (TUT). Learn how controlling eccentric and concentric phases impacts hypertrophy, lifting technique. Updated: 2026-03-27 - What Is Training Frequency? Simply Explained: https://aifithub.io/learn/training-frequency/ Description: Discover training frequency in strength training: how often you hit the gym or a muscle group. Learn its impact on muscle growth, recovery, and program. Updated: 2026-03-27 - What Is VO2 Max? Simply Explained: https://aifithub.io/learn/vo2-max/ Description: Understand VO2 Max: the maximum oxygen your body uses during exercise. Learn why it matters for running performance, how it's measured, and how to improve it. Updated: 2026-03-27 ### Formulas (55) - Hybrid Training Planner Formula: https://aifithub.io/formulas/hybrid-training-planner-formula/ Description: Hybrid weekly plan: 2-3 strength + 3-4 endurance + 1-2 mobility. Schoenfeld/Roberts 2023 framework. AM cardio + PM strength, ≥6h separation, polarized intensity. Updated: 2026-05-15 - Concurrent Training Interference Formula: https://aifithub.io/formulas/concurrent-training-interference-formula/ Description: Computes the hypertrophy penalty from concurrent cardio plus strength training: cardio above 3 sessions per week cuts muscle gain roughly 10-15%. Updated: 2026-05-14 - Cycling FTP Power Zones Formula: https://aifithub.io/formulas/cycling-power-ftp-zones-formula/ Description: Computes Coggan cycling power zones as percentages of FTP, from active recovery near 55% up to anaerobic above 120%, with FTP from a 20-minute test. Updated: 2026-05-14 - Detraining Decay Formula: https://aifithub.io/formulas/detraining-decay-formula/ Description: Detraining decay: strength −5-10% by week 4, −15-20% by week 8. VO2max −7%/week initially. Mujika 2010 meta-analysis. Updated: 2026-05-14 - Female Athlete Formula Suite: https://aifithub.io/formulas/female-athlete-formula/ Description: Female athlete energy availability (RED-S): EA = (intake_kcal − exercise_kcal) / FFM_kg, where EA below 30 kcal/kg is clinically low per IOC 2018 consensus. Updated: 2026-05-14 - Flexibility Score Formula: https://aifithub.io/formulas/flexibility-score-formula/ Description: Flexibility score: Beighton hypermobility (0-9) + FMS Deep Squat (0-3). Beighton ≥5 suggests hypermobility; FMS ≤2 flags movement dysfunction. Updated: 2026-05-14 - Food-to-Exercise Conversion Formula: https://aifithub.io/formulas/food-to-exercise-formula/ Description: Food-to-exercise: minutes_to_burn = food_kcal / (MET × mass_kg × 0.0175). MET values from Ainsworth Compendium 2011. Walk 3.5, run 9.8, cycle moderate 7.5. Updated: 2026-05-14 - HRV Deload Trigger Formula: https://aifithub.io/formulas/hrv-deload-trigger-formula/ Description: HRV deload trigger: morning rMSSD below rolling 7-day baseline by 1.5+ SD for 3 days = deload signal. Plews & Laursen 2017. Use weekly average not daily. Updated: 2026-05-14 - Hybrid Athlete Macro Split Formula: https://aifithub.io/formulas/hybrid-athlete-macro-split-formula/ Description: Hybrid macro split: protein 2.0-2.2 g/kg, carbs 6-8 g/kg endurance day / 4-5 g/kg lift day, fat 0.8-1.0 g/kg. Roberts 2023. Fuels both strength and endurance demand. Updated: 2026-05-14 - Intermittent Fasting Window Formula: https://aifithub.io/formulas/intermittent-fasting-window-formula/ Description: Intermittent fasting window planner: 16:8 base, ±2h around training. Stockman 2018 meta — fat loss equivalent to caloric restriction, no metabolic advantage. Updated: 2026-05-14 - Junk Volume Threshold Formula: https://aifithub.io/formulas/junk-volume-formula/ Description: Junk volume: sets above MAV produce diminishing returns. Schoenfeld 2017 meta-analysis: ≥10 sets/muscle/week, plateau by ~20 sets. Above MRV is regression. Updated: 2026-05-14 - Katch-McArdle Formula: https://aifithub.io/formulas/katch-mcardle-formula/ Description: Katch-McArdle BMR = 370 + 21.6·LBM_kg. Uses lean body mass instead of total mass — more accurate when reliable body-fat data is available. Updated: 2026-05-14 - Macro Cycling Formula: https://aifithub.io/formulas/macro-cycling-formula/ Description: Macro cycling: high-carb training days (≥6 g/kg), lower-carb rest days (3-4 g/kg). Burke & Hawley 2018. Protein constant. Fits weekly periodization. Updated: 2026-05-14 - Marathon Pace Elevation Formula: https://aifithub.io/formulas/marathon-pace-elevation-formula/ Description: Marathon elevation pace correction: about 1.5 sec of finish time per metre climbed, 0.75 sec per metre descended (2:1 asymmetric). Daniels rule of thumb, Minetti 2002 consistent. Updated: 2026-05-14 - Marathon Sweat Rate + Electrolyte Formula: https://aifithub.io/formulas/sweat-rate-electrolyte-marathon-formula/ Description: Marathon hydration: sweat rate 0.5-2.5 L/h, sodium concentration 460-1840 mg/L. Casa 2007 + ACSM 2007 standards. Replace 70-90% of losses; avoid hyponatremia. Updated: 2026-05-14 - Max Muscular Potential Formula (Natural Ceiling): https://aifithub.io/formulas/muscle-gain-potential-formula/ Description: Max muscular potential formula: natural FFMI ceiling near 25 for men and 21 for women (Kouri 1995), with monthly muscle gain rates by training age. Updated: 2026-05-14 - Plate Loading Formula: https://aifithub.io/formulas/plate-loading-formula/ Description: Plate-loading math: greedy descending allocation of plates per side. Olympic 20kg bar (45lb US), standard plate set: 25/20/15/10/5/2.5/1.25 kg per side. Updated: 2026-05-14 - Powerlifting Meet Day Attempt Selector Formula: https://aifithub.io/formulas/meet-day-attempt-selector-formula/ Description: Powerlifting attempts: opener 92-93% 1RM, 2nd attempt 97-99%, 3rd attempt 100-103%. Calgary Barbell methodology. Open low to bank a total; close strong for total. Updated: 2026-05-14 - Race-Week Taper Formula + Carb Loading (Burke): https://aifithub.io/formulas/race-week-taper-formula/ Description: Race-week taper math: cut training volume 41-60% over 8-14 days while holding intensity, then carb-load 7-12 g/kg (Burke 2011) for a ~3% faster race. Updated: 2026-10-05 - Resting Heart Rate Formula + Interpretation: https://aifithub.io/formulas/resting-heart-rate-formula/ Description: Resting heart rate: morning supine 5-min average. Adult normal 60-100 bpm; trained 40-60. AHA 2019. +5 bpm sustained signals overreaching (Lehmann 1998). Updated: 2026-05-14 - Riegel Race Time Formula: https://aifithub.io/formulas/riegel-race-time-formula/ Description: Riegel race time prediction: T2 = T1 × (D2/D1)^1.06. Race-time prediction across distances. Valid 5K–marathon, breaks down beyond 30K. Updated: 2026-05-14 - RPE to Percentage Formula (Tuchscherer): https://aifithub.io/formulas/rpe-to-percentage-formula/ Description: RPE to % 1RM (Tuchscherer table). RPE 10 = 100% 1RM. Each RPE point ≈ 2-3% drop. Powerlifting autoregulation standard. Updated: 2026-05-14 - Run Training Paces from a Race Time (Daniels VDOT): https://aifithub.io/formulas/run-training-paces-formula/ Description: Run training paces from a recent race time: get your easy, marathon, threshold, interval, and repetition paces using Daniels' VDOT model. Updated: 2026-05-14 - Sleep Cycle Formula (90-Min): https://aifithub.io/formulas/sleep-calculator-formula/ Description: 90-min sleep cycle planning: bedtime = wake_time − (cycles × 90 min) − 15 min sleep latency. 4-6 cycles per night. Waking at cycle end reduces sleep inertia. Updated: 2026-05-14 - Sleep Debt Formula: https://aifithub.io/formulas/sleep-debt-formula/ Description: Sleep debt formula: rolling 14-day deficit vs need. Van Dongen 2003 showed performance decline at <6h for 14 days = equivalent to 24h total sleep deprivation. AASM 7-9h adult need. Updated: 2026-05-14 - Smolov / Sheiko / Texas Method Formula: https://aifithub.io/formulas/smolov-sheiko-texas-formula/ Description: Three powerlifting peaking programs: Smolov (13-week squat, 70-90% 1RM), Sheiko (high-frequency 4 days, 70-85%), Texas Method (3-day split, 90-105%). Volume-to-intensity-to-peak progression. Updated: 2026-05-14 - Strength Percentile Formula: https://aifithub.io/formulas/strength-percentile-formula/ Description: Strength percentile: lookup 1RM-to-population-percentile in DOTS-normalized tables. Symmetric Strength / Open Powerlifting / Strength Level data. Bodyweight + sex + lift specific. Updated: 2026-05-14 - Treadmill to Outdoor Pace Conversion Formula: https://aifithub.io/formulas/treadmill-pace-converter-formula/ Description: Treadmill grade adjustment: 0% treadmill = outdoor pace + 12 sec/km (no wind resistance). +1% grade adds ~3.3% energy cost (Jones & Doust 1996). 1-2% grade simulates outdoor effort. Updated: 2026-05-14 - Velocity-Based 1RM Formula: https://aifithub.io/formulas/velocity-based-1rm-formula/ Description: Velocity-based 1RM: load-velocity profile, MVT (minimum velocity threshold) per lift. González-Badillo 2010 method. Bench 0.17 m/s, squat 0.30 m/s, deadlift 0.15 m/s. Updated: 2026-05-14 - Wendler 5/3/1 Formula: https://aifithub.io/formulas/wendler-531-formula/ Description: Wendler 5/3/1: training max = 90% true 1RM. 4-week cycle: 5/5/5+, 3/3/3+, 5/3/1+, deload. Add 5 lb upper / 10 lb lower per cycle. Jim Wendler Beyond 5/3/1. Updated: 2026-05-14 - BMI Formula: https://aifithub.io/formulas/bmi-formula/ Description: BMI = weight in kilograms divided by height in meters squared. Quick screening number, blind to body composition. Cutoffs are 18.5 / 25 / 30 (WHO). Updated: 2026-05-10 - BMR Formula (Mifflin-St Jeor): https://aifithub.io/formulas/bmr-formula/ Description: BMR = 10·mass_kg + 6.25·height_cm − 5·age + sex_constant. Mifflin-St Jeor 1990. Sex constant: +5 male, −161 female. Used as the baseline for TDEE and deficit math. Updated: 2026-05-10 - Body Fat Percentage Formula (US Navy): https://aifithub.io/formulas/body-fat-formula/ Description: US Navy circumference-based body fat. Men: 86.010·log10(waist−neck) − 70.041·log10(height) + 36.76. Women: 163.205·log10(waist+hip−neck) − 97.684·log10(height) − 78.387. Updated: 2026-05-10 - Body Recomposition Formula: https://aifithub.io/formulas/body-recomposition-formula/ Description: Body recomposition formula: target_weight = LBM / (1 − target_BF%/100). weekly_fat_loss = (current_weight − target_weight) / weeks. Updated: 2026-05-10 - Calorie Deficit Formula: https://aifithub.io/formulas/calorie-deficit-formula/ Description: The calorie deficit formula: daily deficit = TDEE minus intake, with 1 lb fat about 3,500 cal and 1 kg about 7,700 cal, plus a worked weekly-loss example. Updated: 2026-05-10 - Calories Burned Formula (MET): https://aifithub.io/formulas/calories-burned-formula/ Description: Calories burned = MET × body weight (kg) × hours. METs come from the Compendium of Physical Activities; 1 MET is about 1 kcal per kg per hour. Updated: 2026-10-05 - Creatine Loading Formula: https://aifithub.io/formulas/creatine-loading-formula/ Description: Creatine loading formula: 0.3 g/kg/day for 5–7 days, split 4× daily. Maintenance: 0.03 g/kg/day or 3–5 g flat. Same saturation in ~7 vs ~28 days. Updated: 2026-05-10 - Daily Water Intake Formula: https://aifithub.io/formulas/water-intake-formula/ Description: Daily water intake formula: water_ml = 30·mass_kg (sedentary) to 35·mass_kg (active). Add 350–500 ml/hour exercise. Food covers ~20%. Updated: 2026-05-10 - DOTS Score Formula: https://aifithub.io/formulas/dots-score-formula/ Description: DOTS = total_kg × (500 / (a + b·bw + c·bw² + d·bw³ + e·bw⁴)). Sex-specific polynomial coefficients. Updated: 2026-10-05 - FFMI Formula: Kouri-Adjusted Fat-Free Mass Index: https://aifithub.io/formulas/ffmi-formula/ Description: FFMI formula: FFMI = LBM_kg / (height_m)² + 6.1·(1.8 − height_m). The +6.1·(1.8−h) normalizes to a 1.8 m reference. Natural ceiling ~25 male, ~22 female. Updated: 2026-05-10 - Heart Rate Zone Formula (Karvonen): https://aifithub.io/formulas/heart-rate-zone-formula/ Description: Heart rate zone formula (Karvonen): target_HR = (HRmax − HRrest) × intensity_pct + HRrest. HRmax ≈ 208 − 0.7·age (Tanaka). Updated: 2026-05-10 - Ideal Weight Formula (Devine 1974): https://aifithub.io/formulas/ideal-weight-formula/ Description: Ideal weight formula from the Devine 1974 equation: men 50 + 2.3 kg per inch over 60, women 45.5 + 2.3, plus Robinson, Miller and Hamwi variants. Updated: 2026-05-10 - Lean Body Mass Formula (Boer): https://aifithub.io/formulas/lean-body-mass-formula/ Description: Lean body mass formula (Boer 1984). Male: LBM = 0.407·mass_kg + 0.267·height_cm − 19.2. Female: LBM = 0.252·mass_kg + 0.473·height_cm − 48.3. Updated: 2026-05-10 - Macronutrient Ratio Formula: https://aifithub.io/formulas/macro-ratio-formula/ Description: Macronutrient ratio formula: protein 1.6–2.2 g/kg, fat 0.6–1.0 g/kg (≥20% of calories), carbs = (total cal − protein·4 − fat·9) / 4. Updated: 2026-05-10 - One-Rep Max Formula (Epley): https://aifithub.io/formulas/one-rep-max-formula/ Description: One-rep max formula (Epley): epley 1985: 1RM = weight × (1 + reps / 30). Most accurate for 3–8 reps. Brzycki and Lombardi are common alternatives. Updated: 2026-05-10 - Progressive Overload Formula: https://aifithub.io/formulas/progressive-overload-formula/ Description: Progressive overload formula: next-week target = current load × (1 + overload_rate). Typical 2.5% novice / 1.5% intermediate / 0.5% advanced. Updated: 2026-05-10 - Protein Intake Formula: https://aifithub.io/formulas/protein-intake-formula/ Description: protein_g = mass_kg × goal_factor. Goal factors: 0.8 sedentary (RDA), 1.6 trained baseline, 1.8 deficit / hypertrophy, 2.2 advanced cut or older lifter. Updated: 2026-05-10 - Running Pace Formula: Riegel & VDOT Race Pace Conversion: https://aifithub.io/formulas/running-pace-formula/ Description: Running pace formula: pace = time / distance, plus Riegel T2 = T1 x (D2/D1)^1.06 for race-equivalent paces. Worked 10K-to-half-marathon example. Updated: 2026-05-10 - Sweat Rate Formula: https://aifithub.io/formulas/sweat-rate-formula/ Description: sweat_rate_L_per_hour = (mass_pre − mass_post + fluid_consumed_L − urine_L) / duration_hours. Updated: 2026-05-10 - Swim Pace Formula: https://aifithub.io/formulas/swim-pace-formula/ Description: Swim pace formula: pace_per_100m = total_seconds × 100 / total_distance_m. Open-water surcharge: typically +5–15 sec per 100 m. Updated: 2026-05-10 - TDEE Formula: https://aifithub.io/formulas/tdee-formula/ Description: TDEE = BMR × activity factor. Factors: 1.2 sedentary, 1.375 light, 1.55 moderate, 1.725 very active, 1.9 athlete. Drives fat-loss deficit and lean-gain surplus math. Updated: 2026-05-10 - VO₂ Max Formula (Cooper Test): https://aifithub.io/formulas/vo2-max-formula/ Description: Cooper 12-min run: VO₂max = (distance_m − 504.9) / 44.73. Other estimates: Rockport walk, 1.5-mile run, Storer cycle ergometer. Updated: 2026-05-10 - Waist-to-Hip Ratio Formula: https://aifithub.io/formulas/waist-to-hip-ratio-formula/ Description: Computes waist-to-hip ratio as waist circumference divided by hip circumference; WHO cardiometabolic risk cutoffs are 0.90 for men and 0.85 for women. Updated: 2026-05-10 - Walking Calorie Formula: https://aifithub.io/formulas/walking-calorie-formula/ Description: Walking calories ≈ MET × 3.5 × mass_kg × minutes / 200, with MET = 2.0 stroll / 3.5 brisk / 5.0 fast / 6.3 power walk. Apply 1 + 0.02·grade for incline. Updated: 2026-05-10 - Workout Volume Formula: https://aifithub.io/formulas/workout-volume-formula/ Description: Workout volume formula: volume load = sets × reps × weight. Hard sets = total sets within 2 reps of failure per muscle group per week. Updated: 2026-05-10 ### Examples (29) - BMI Examples: https://aifithub.io/examples/bmi-examples/ Description: Explore practical BMI examples across diverse scenarios, from athletes to seniors, revealing key insights into its utility and limitations for health. Updated: 2026-03-27 - BMR Examples: https://aifithub.io/examples/bmr-examples/ Description: Explore diverse BMR examples to understand your baseline metabolism for effective fat loss. Learn how age, weight, and lifestyle impact your daily calorie. Updated: 2026-03-27 - Body Fat Examples: https://aifithub.io/examples/body-fat-examples/ Description: Explore diverse real-world body fat examples, from sedentary professionals to athletes and new mothers, revealing unique insights into health, performance. Updated: 2026-03-27 - Body Recomposition Examples: https://aifithub.io/examples/body-recomposition-examples/ Description: Explore real-world body recomposition examples, from busy professionals to athletes and new parents, revealing how to build muscle and lose fat. Updated: 2026-03-27 - Calorie Deficit Examples: https://aifithub.io/examples/calorie-deficit-examples/ Description: Explore practical calorie deficit examples tailored for diverse lifestyles, from sedentary office workers to active individuals, for sustainable fat loss. Updated: 2026-03-27 - Calories Burned Examples: https://aifithub.io/examples/calories-burned-examples/ Description: Calories burned examples: explore diverse real-world scenarios demonstrating how various activities, from professional duties to leisure, impact daily calorie. Updated: 2026-10-05 - Creatine Dosage Examples: https://aifithub.io/examples/creatine-dosage-examples/ Description: Explore practical creatine dosage examples for diverse scenarios, from elite athletes to seniors, focusing on optimal intake for performance, recovery. Updated: 2026-10-05 - DOTS Score Examples: https://aifithub.io/examples/dots-score-examples/ Description: Explore real-world applications of the DOTS strength score for fair comparison across diverse athletes and weight classes, from competitive powerlifting. Updated: 2026-10-05 - FFMI Examples: https://aifithub.io/examples/ffmi-examples/ Description: Explore practical FFMI examples for athletes, beginners, and older adults. Learn how Fat-Free Mass Index reveals body composition and natural muscle limits. Updated: 2026-03-27 - Flexibility Score Examples: https://aifithub.io/examples/flexibility-score-examples/ Description: Discover real-world scenarios illustrating how flexibility scores impact recovery, performance, and daily life. Learn non-obvious insights on improving. Updated: 2026-10-05 - Heart Rate Zone Examples: https://aifithub.io/examples/heart-rate-zone-examples/ Description: Heart rate zone examples for fat loss, endurance, and peak performance. Real scenarios for busy professionals, runners, and rehabilitation patients. Updated: 2026-03-27 - Ideal Weight Examples: https://aifithub.io/examples/ideal-weight-examples/ Description: Discover diverse ideal weight examples for athletes, sedentary individuals, and more. Learn how factors like body composition, age, and lifestyle redefine. Updated: 2026-03-27 - Intermittent Fasting Examples: https://aifithub.io/examples/intermittent-fasting-examples/ Description: Explore practical intermittent fasting examples for diverse lifestyles, from busy professionals to endurance athletes. Understand how flexible fasting. Updated: 2026-03-27 - Lean Body Mass Examples: https://aifithub.io/examples/lean-body-mass-examples/ Description: Explore diverse lean body mass examples across fitness, health, and wellness scenarios. Understand its critical role in tracking real progress beyond just. Updated: 2026-05-27 - Macro Calculator Examples: https://aifithub.io/examples/macro-calculator-examples/ Description: Macro calculator examples for sedentary professionals, runners, lifters, and elite athletes. See real targets and how to adjust for your body and goal. Updated: 2026-03-27 - One Rep Max Examples: https://aifithub.io/examples/one-rep-max-examples/ Description: Explore diverse One Rep Max (1RM) examples across fitness levels and scenarios. Learn how this metric informs training, tracks progress, and prevents. Updated: 2026-03-27 - Progressive Overload Examples: https://aifithub.io/examples/progressive-overload-examples/ Description: Progressive Overload examples: discover how to continuously challenge your body for consistent gains in strength, endurance, and skill. Updated: 2026-10-05 - Protein Intake Examples: https://aifithub.io/examples/protein-intake-examples/ Description: Expert examples demystify protein intake. Learn optimal strategies for athletes, busy professionals, and older adults to boost recovery, satiety. Updated: 2026-03-27 - Run Training Paces Examples: https://aifithub.io/examples/run-training-paces-examples/ Description: Learn run training paces through practical, worked examples. See how to calculate easy, tempo, interval, and race paces for various goals and scenarios. Updated: 2026-10-05 - Running Pace Examples: https://aifithub.io/examples/running-pace-examples/ Description: Learn to calculate and tune your running pace for various goals, from beginner 5Ks to marathon strategies and challenging trail ultra-marathons. Updated: 2026-03-27 - Sleep Calculator Examples: https://aifithub.io/examples/sleep-calculator-examples/ Description: Explore practical sleep calculator examples for diverse scenarios like shift work, startup life, and athletic training to optimize recovery and performance. Updated: 2026-10-05 - Strength Standards Examples: https://aifithub.io/examples/strength-standards-examples/ Description: Discover practical strength standards examples across diverse scenarios, from corporate wellness to elite sports and tactical professions, offering unique. Updated: 2026-10-05 - Sweat Rate Examples: https://aifithub.io/examples/sweat-rate-examples/ Description: Discover practical sweat rate examples from athletes to industrial workers. Learn to calculate your fluid loss for personalized hydration, boosting health. Updated: 2026-10-05 - Swim Pace Examples: https://aifithub.io/examples/swim-pace-examples/ Description: Plan your swim training with practical examples. Learn to calculate, understand, and apply swim pace for triathlons, fitness goals, and open water events. Updated: 2026-03-27 - TDEE Examples: https://aifithub.io/examples/tdee-examples/ Description: Discover how Total Daily Energy Expenditure (TDEE) varies across diverse lifestyles. Learn to calculate your TDEE and apply it for effective fat loss. Updated: 2026-03-27 - VO2 Max Examples: https://aifithub.io/examples/vo2-max-examples/ Description: Explore diverse VO2 max examples, from corporate wellness to elite athletic training, demonstrating its impact on health, performance, and job readiness. Updated: 2026-10-05 - Walking Calorie Examples: https://aifithub.io/examples/walking-calorie-examples/ Description: Discover practical walking calorie examples for fat loss across diverse daily scenarios. Learn how everyday steps accumulate significant energy. Updated: 2026-10-05 - Water Intake Examples: https://aifithub.io/examples/water-intake-examples/ Description: Water intake examples worked through the calculator: an 80 kg person on a moderate day, a heavy training day, a hot climate, and a heavier 95 kg body. Updated: 2026-10-05 - Workout Volume Examples: https://aifithub.io/examples/workout-volume-examples/ Description: Explore practical workout volume calculations and strategies for diverse fitness goals, from busy professionals to athletes, maximizing strength. Updated: 2026-03-27 ### Statistics (23) - Average TDEE by Age, Sex, and Activity Level: https://aifithub.io/statistics/tdee-statistics/ Description: Reference data for average TDEE values across demographics. See how your TDEE compares to population averages by age, sex, weight, and activity level. Updated: 2026-04-25 - Calorie Deficit Statistics: Fat Loss by the Numbers: https://aifithub.io/statistics/calorie-deficit-statistics/ Description: Key statistics on calorie deficits, weight loss rates, adherence, metabolic adaptation, and long-term maintenance. Evidence from meta-analyses. Updated: 2026-04-25 - One-Rep Max Statistics: Strength Standards by Lift: https://aifithub.io/statistics/one-rep-max-statistics/ Description: One-rep max Statistics: strength Standards by Lift: how strong is the average lifter? Reference data for bench press, squat, deadlift, and overhead press 1RM. Updated: 2026-04-25 - Body Composition Statistics: Body Fat & Lean Mass Norms: https://aifithub.io/statistics/body-composition-statistics/ Description: Evidence-based body composition statistics: average body fat percentages, lean mass norms by sex and age, measurement accuracy, and natural FFMI ceilings. Updated: 2026-04-25 - Creatine Statistics: Effects on Strength, Power & Health: https://aifithub.io/statistics/creatine-statistics/ Description: Evidence-based creatine statistics: strength gains, optimal dosing, safety profile, cognitive effects, and clinical applications from peer-reviewed. Updated: 2026-04-25 - Fitness App Statistics: Adoption, Adherence & Outcomes: https://aifithub.io/statistics/fitness-app-statistics/ Description: Evidence-based fitness-app statistics: adoption rates, app-driven activity outcomes, retention curves, and clinical-trial efficacy from peer-reviewed. Updated: 2026-04-25 - Flexibility Statistics: Norms, Methods & Effects: https://aifithub.io/statistics/flexibility-statistics/ Description: Evidence-based flexibility statistics: range-of-motion norms, stretching method comparisons, age-related changes, and performance-injury implications. Updated: 2026-04-25 - Gym Membership Statistics: US Trends and Demographics: https://aifithub.io/statistics/gym-membership-statistics/ Description: Evidence-based gym-membership statistics from the Health & Fitness Association (formerly IHRSA): US membership counts, growth rates, equipment use. Updated: 2026-04-25 - Home Gym Statistics: Adoption, Outcomes, & Equipment: https://aifithub.io/statistics/home-gym-statistics/ Description: Evidence-based home gym statistics: post-pandemic adoption rates, home vs. commercial outcome comparisons, equipment trends, and adherence research. Updated: 2026-04-25 - Hydration Statistics: Daily Needs and Performance Impact: https://aifithub.io/statistics/hydration-statistics/ Description: Evidence-based hydration statistics: IOM water requirements, sweat rates, dehydration performance impact, and clinical thresholds from authoritative sources. Updated: 2026-04-25 - Intermittent Fasting Statistics: Outcomes & Effects: https://aifithub.io/statistics/intermittent-fasting-statistics/ Description: Evidence-based intermittent fasting statistics: weight loss outcomes, metabolic effects, adherence rates, and head-to-head comparisons with continuous. Updated: 2026-04-25 - Marathon Statistics: Finishing Times, Demographics & Records: https://aifithub.io/statistics/marathon-statistics/ Description: Evidence-based marathon statistics: average finishing times, world records, age trends, training mileage norms, and DNF rates from peer-reviewed. Updated: 2026-04-25 - Meal Prep Statistics: Cooking & Adherence Outcomes: https://aifithub.io/statistics/meal-prep-statistics/ Description: Evidence-based meal-prep statistics: home-cooking adherence, food-tracking accuracy, dietary-quality outcomes, and time/cost savings from peer-reviewed. Updated: 2026-04-25 - Mobility & Injury Statistics: Risk Factors and Outcomes: https://aifithub.io/statistics/mobility-injury-statistics/ Description: Evidence-based mobility and injury statistics: prevalence rates, risk factors, intervention efficacy, and recovery timelines from peer-reviewed. Updated: 2026-04-25 - Obesity Statistics: Prevalence, Health Risks, and Trends: https://aifithub.io/statistics/obesity-statistics/ Description: Evidence-based obesity statistics: US prevalence, global trends, health-cost burden, mortality risk, comorbidity rates, and treatment outcomes from CDC. Updated: 2026-04-25 - Overtraining Statistics: Symptoms, Recovery, & Prevalence: https://aifithub.io/statistics/overtraining-statistics/ Description: Evidence-based overtraining statistics: prevalence in athletes, recovery timelines, hormonal markers, and validated screening tools from peer-reviewed. Updated: 2026-04-25 - Periodization Statistics: Block, Linear & Undulating Models: https://aifithub.io/statistics/periodization-statistics/ Description: Evidence-based periodization statistics: meta-analysis comparisons of linear, undulating, and block models, plus deload effects and program-design outcomes. Updated: 2026-04-25 - Protein Intake Statistics: Daily Requirements & Effects: https://aifithub.io/statistics/protein-intake-statistics/ Description: Evidence-based protein intake statistics: RDA baselines, optimal intakes for muscle gain, satiety effects, plant vs. animal protein research. Updated: 2026-04-25 - Running Statistics: Mortality, Performance, & Injury Data: https://aifithub.io/statistics/running-statistics/ Description: Evidence-based running statistics: mortality reduction, optimal weekly mileage, injury rates, VO2 max norms, and finishing-time benchmarks. Updated: 2026-04-25 - Sleep Statistics: Performance, Recovery, and Health Data: https://aifithub.io/statistics/sleep-statistics/ Description: Evidence-based sleep statistics: prevalence of insufficient sleep, effect on testosterone and muscle protein synthesis, athletic performance impact. Updated: 2026-04-25 - Strength Training Statistics: Health & Mortality Data: https://aifithub.io/statistics/strength-training-statistics/ Description: Evidence-based strength training statistics: participation rates, mortality reduction, optimal volume thresholds, hypertrophy dose-response, and adherence. Updated: 2026-04-25 - Supplement Industry Statistics: Use, Efficacy, & Safety: https://aifithub.io/statistics/supplement-industry-statistics/ Description: Evidence-based supplement-industry statistics: US prevalence, peer-reviewed efficacy by category, contamination findings, and FDA regulatory context. Updated: 2026-04-25 - Weight Loss Statistics: Real-World Outcomes by the Numbers: https://aifithub.io/statistics/weight-loss-statistics/ Description: Evidence-based weight loss statistics: maintenance rates, real-world deficit outcomes, predictors of success, and treatment effectiveness. Updated: 2026-04-25