Python Package · 3 Agent Skills

Fitness Tools is a Python package that facilitates healthy lifestyles using validated, research-backed equations. Whether you're a wellness professional, veteran gym rat, or just starting your fitness journey, this package will benefit you.

• Body Composition: Estimate body fat percentage from skinfold measurements using Durnin-Womersley and Jackson-Pollock (3/4/7-site) equations
• Rep Max Estimation: Convert between weight and rep ranges using a validated percentage-of-1RM table
• Macronutrient Planning: Calculate daily calorie ranges and macro distributions by body type, activity level, and goal

No third-party dependencies. Python 3.11+ only.

pip install fitness-tools

from fitness_tools import DurninWomersley, Sex

calc = DurninWomersley(30, Sex.MALE, (12, 8, 15, 10))
density = calc.body_density()
body_fat = calc.siri(density)

from fitness_tools import RM_Estimator

est = RM_Estimator(current_weight=185.0, current_reps=8, desired_reps=1)
result = est.estimate_weight(base=2.5)

from fitness_tools import MakeMeal, BodyType, ActivityLevel, Goal

meal = MakeMeal(
    weight=150,
    body_type=BodyType.MESOMORPH,
    activity_level=ActivityLevel.VERY,
    goal=Goal.MAINTENANCE,
)
daily = meal.daily_requirements()
per_meal = meal.make_meal(number_meals=5)

All public types are importable from fitness_tools:

This package includes 3 skills for AI-assisted fitness calculations:

Claude Code plugin run inside a Claude Code session:

/plugin marketplace add Jeffallan/Fitness-Tools
/plugin install fitness-tools@fitness-tools

skills.sh from any terminal:

npx skills add Jeffallan/Fitness-Tools

• Read the contributing guidelines
• Check the changelog to see where this project has been

All skill levels are welcome and our maintainers will help you in whatever way we can.

This project is licensed under the Apache 2.0 License.