{
  "tool_id": "vo2_max_estimator",
  "slug": "vo2-max-estimator",
  "path": "/vo2-max-estimator/",
  "mode": "engine_module",
  "usage": "Client-side calculator. Open https://aifithub.io/vo2-max-estimator/ and fill in the inputs; results render in-browser. Also importable as ES module from https://aifithub.io/engines/vo2-max-estimator.js — call compute(input) with the JSON shape below.",
  "methodology": "https://aifithub.io/methodology/vo2-max-estimator/",
  "sample_input": {
    "tool": "vo2_max_estimator",
    "method": "questionnaire",
    "distance_meters": 2400,
    "weight_kg": 75,
    "age": 30,
    "sex": "male",
    "walk_time_minutes": 15,
    "heart_rate_after": 140,
    "activity_level": "moderate"
  },
  "input_schema": {
    "type": "object",
    "properties": {
      "tool": {
        "type": "string"
      },
      "method": {
        "type": "string"
      },
      "distance_meters": {
        "type": "number"
      },
      "weight_kg": {
        "type": "number"
      },
      "age": {
        "type": "number"
      },
      "sex": {
        "type": "string"
      },
      "walk_time_minutes": {
        "type": "number"
      },
      "heart_rate_after": {
        "type": "number"
      },
      "activity_level": {
        "type": "string"
      }
    },
    "required": [
      "tool",
      "method",
      "distance_meters",
      "weight_kg",
      "age",
      "sex",
      "walk_time_minutes",
      "heart_rate_after",
      "activity_level"
    ]
  },
  "output_schema": {
    "type": "object",
    "properties": {
      "vo2max": {
        "type": "number"
      },
      "classification": {
        "type": "object",
        "properties": {
          "label": {
            "type": "string"
          },
          "color": {
            "type": "string"
          }
        }
      },
      "fitnessAge": {
        "type": "number"
      },
      "methodName": {
        "type": "string"
      },
      "formula": {
        "type": "string"
      }
    }
  }
}