fitness-nutrition

SKILL.md preview

---
name: fitness-nutrition
description: >
  Gym workout planner and nutrition tracker. Search 690+ exercises by muscle,
  equipment, or category via wger. Look up macros and calories for 380,000+
  foods via USDA FoodData Central. Compute BMI, TDEE, one-rep max, macro
  splits, and body fat — pure Python, no pip installs. Built for anyone
  chasing gains, cutting weight, or just trying to eat better.
platforms: [linux, macos, windows]
version: 1.0.0
authors:
  - haileymarshall
license: MIT
metadata:
  hermes:
    tags: [health, fitness, nutrition, gym, workout, diet, exercise]
    category: health
    prerequisites:
      commands: [curl, python3]
required_environment_variables:
  - name: USDA_API_KEY
    prompt: "USDA FoodData Central API key (free)"
    help: "Get one free at https://fdc.nal.usda.gov/api-key-signup/ — or skip to use DEMO_KEY with lower rate limits"
    required_for: "higher rate limits on food/nutrition lookups (DEMO_KEY works without signup)"
    optional: true
---

# 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 equipment → use `/api/v2/exercise/?equipment={id}&language=2&status=2&format=json`
- By name → use `/api/v2/exercise/search/?term={query}&language=english&format=json`
- Full details → use `/api/v2/exerciseinfo/{exercise_id}/?format=json`

**Step 2 — Reference IDs (so you don't need extra API calls):**

Exercise categories:

| ID | Category    |
|----|-------------|
| 8  | Arms        |
| 9  | Legs        |
| 10 | Abs         |
| 11 | Chest       |
| 12 | Back        |
| 13 | Shoulders   |
| 14 | Calves      |
| 15 | Cardio      |

Muscles:

| ID | Muscle                    | ID | Muscle                  |
|----|---------------------------|----|-------------------------|
| 1  | Biceps brachii            | 2  | Anterior deltoid        |
| 3  | Serratus anterior         | 4  | Pectoralis major        |
| 5  | Obliquus externus         | 6  | Gastrocnemius           |
| 7  | Rectus abdominis          | 8  | Gluteus maximus         |
| 9  | Trapezius                 | 10 | Quadriceps femoris      |
| 11 | Biceps femoris            | 12 | Latissimus dorsi        |
| 13 | Brachialis                | 14 | Triceps brachii         |
| 15 | Soleus                    |    |                         |

Equipment:

| ID | Equipment      |
|----|----------------|
| 1  | Barbell        |
| 3  | Dumbbell       |
| 4  | Gym mat        |
| 5  | Swiss Ball     |
| 6  | Pull-up bar    |
| 7  | none (bodyweight) |
| 8  | Bench          |
| 9  | Incline bench  |
| 10 | Kettlebell     |

**Step 3 — Fe

…