Hydration: body-mass loss, rehydration, in-exercise fluid and sodium
POST /sports/hydration · API key required
Body-mass loss % (2% can impair endurance, 3-4% team sports), rehydration at 25-50% more than the loss (450-675 mL per lb), 80% before a second session, in-exercise fluid and sodium (0.5-0.7 g/L over 1 hour), urine specific gravity band, child and master-athlete rules, heat warning. The sweat estimate is a standard mass balance, not a chapter formula. Daily needs: GET /dri?nutrient=water_l.
Request body
Content type: application/json
Responses
200- Calculation with steps, warnings and sources400- Invalid input401- Missing or invalid API key429- Rate limited