{
  "calculator": "cycling-power-ftp-zone-calculator",
  "title": "Cycling Power & FTP Zone Calculator",
  "site": "AI Fit Hub",
  "input": {
    "ftp": 250,
    "weight_kg": 75
  },
  "defaults_used": {},
  "result": {
    "ftp": 250,
    "wPerKg": 3.3333333333333335,
    "wPerKgCategory": "Trained",
    "zones": [
      {
        "zone": 1,
        "name": "Active Recovery",
        "description": "Very easy, recovery rides. <55% FTP.",
        "minWatts": 0,
        "maxWatts": 138
      },
      {
        "zone": 2,
        "name": "Endurance",
        "description": "All-day aerobic base. 56–75% FTP.",
        "minWatts": 140,
        "maxWatts": 188
      },
      {
        "zone": 3,
        "name": "Tempo",
        "description": "Sustained effort, comfortably hard. 76–90% FTP.",
        "minWatts": 190,
        "maxWatts": 225
      },
      {
        "zone": 4,
        "name": "Lactate Threshold",
        "description": "Race pace, 1-hour max effort. 91–105% FTP.",
        "minWatts": 228,
        "maxWatts": 263
      },
      {
        "zone": 5,
        "name": "VO2 Max",
        "description": "Hard interval work, 3–8 min. 106–120% FTP.",
        "minWatts": 265,
        "maxWatts": 300
      },
      {
        "zone": 6,
        "name": "Anaerobic Capacity",
        "description": "Short maximal efforts, 30s–2 min. 121–150% FTP.",
        "minWatts": 303,
        "maxWatts": 375
      },
      {
        "zone": 7,
        "name": "Neuromuscular",
        "description": "Sprint power, <30 sec. >150% FTP.",
        "minWatts": 378,
        "maxWatts": null
      }
    ]
  },
  "provenance": {
    "run": "https://aifithub.io/api/run/cycling-power-ftp-zone-calculator?ftp=250&weight_kg=75",
    "page": "https://aifithub.io/cycling-power-ftp-zone-calculator/",
    "methodology": "https://aifithub.io/methodology/cycling-power-ftp-zone-calculator/",
    "contract": "https://aifithub.io/contracts/cycling-power-ftp-zone-calculator.json",
    "engine": "https://aifithub.io/engines/cycling-power-ftp-zone-calculator.js",
    "engine_sha256": "93743454071a34192c1ef251f3e40abd57dd170abb5d269fd8e07f0da8e6c47b",
    "build": "9e8a56a16bda662ba90601b49561a2b176e9c379"
  },
  "disclaimer": "General fitness estimates — not medical advice.",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "cite": "AI Fit Hub, Cycling Power & FTP Zone Calculator (engine 93743454071a), https://aifithub.io/api/run/cycling-power-ftp-zone-calculator?ftp=250&weight_kg=75"
}