{
  "calculator": "vo2-max-estimator",
  "title": "VO2 Max Estimator",
  "site": "AI Fit Hub",
  "input": {},
  "defaults_used": {
    "method": "cooper",
    "age": 30,
    "sex": "male",
    "weight_kg": 75,
    "distance_meters": 2200,
    "walk_time_minutes": 15,
    "heart_rate_after": 140
  },
  "result": {
    "vo2max": 37.9,
    "classification": {
      "label": "Fair",
      "color": "#facc15"
    },
    "classificationBounds": [
      33.8,
      37.8,
      42.4,
      47,
      51.7
    ],
    "normsAgeBand": "30-39",
    "fitnessAge": 52,
    "methodName": "Cooper 12-Minute Run Test",
    "formula": "VO₂max = (distance_m − 504.9) ÷ 44.73"
  },
  "provenance": {
    "run": "https://aifithub.io/api/run/vo2-max-estimator",
    "page": "https://aifithub.io/vo2-max-estimator/",
    "methodology": "https://aifithub.io/methodology/vo2-max-estimator/",
    "contract": "https://aifithub.io/contracts/vo2-max-estimator.json",
    "engine": "https://aifithub.io/engines/vo2-max-estimator.js",
    "engine_sha256": "558a6df4f29b971214ac7bad3eca91041d3fb7c76dae2da9df24622e38eee825",
    "build": "9e8a56a16bda662ba90601b49561a2b176e9c379"
  },
  "disclaimer": "General fitness estimates — not medical advice.",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "cite": "AI Fit Hub, VO2 Max Estimator (engine 558a6df4f29b), https://aifithub.io/api/run/vo2-max-estimator"
}