fitness-nutrition

# Fitness & Nutrition Expert fitness coach and sports nutritionist skill. Two data sources plus offline calculators — everything a gym-goer needs in one place. **Data sources (all free, no pip dependencies):** - **wger** (https://wger.de/api/v2/) — open exercise database, 690+ exercises with muscles, equipment, images. Public endpoints need zero authentication. - **USDA FoodData Central** (https://api.nal.usda.gov/fdc/v1/) — US government nutrition database, 380,000+ foods. `DEMO_KEY` works instantly; free signup for higher limits. **Offline calculators (pure stdlib Python):** - BMI, TDEE (Mifflin-St Jeor), one-rep max (Epley/Brzycki/Lombardi), macro splits, body fat % (US Navy method) --- ## When to Use Trigger this skill when the user asks about: - Exercises, workouts, gym routines, muscle groups, workout splits - Food macros, calories, protein content, meal planning, calorie counting - Body composition: BMI, body fat, TDEE, caloric surplus/deficit - One-rep max estimates, training percentages, progressive overload - Macro ratios for cutting, bulking, or maintenance --- ## Procedure ### Exercise Lookup (wger API) All wger public endpoints return JSON and require no auth. Always add `format=json` and `language=2` (English) to exercise queries. **Step 1 — Identify what the user wants:** - By muscle → use `/api/v2/exercise/?muscles={id}&language=2&status=2&format=json` - By category → use `/api/v2/exercise/?category={id}&language=2&status=2&format=json` - By equi...