{"name":"calories_burned","title":"Calories Burned (MET)","category":"fitness","description":"Calories burned for an activity from its MET value, body weight and duration, plus a comparison table of common activities at the same weight and time.","price_usd":0.001,"input_schema":{"type":"object","properties":{"activity":{"type":"string","description":"walking | running | cycling | swimming | jump_rope | weightlifting | yoga | hiking | rowing | elliptical | basketball | soccer | tennis | ..."},"weight_kg":{"type":"number","description":"Body weight in kilograms"},"duration_min":{"type":"number","description":"Activity duration in minutes"}},"additionalProperties":false,"required":["activity","weight_kg","duration_min"]}}