# Fitness Tools
> 3 specialized fitness skills — validated, research-backed equations for body composition, rep max estimation, and macronutrient planning.

## Skills
- [Body Composition](/skills/body-composition/index.html.md): Use when assessing body fat percentage from skinfold measurements, calculating body density, or interpreting body composition results using Durnin-Womersley or Jackson-Pollock equations.
- [Meal Planner](/skills/meal-planner/index.html.md): Use when planning macronutrient targets, calculating daily calorie ranges, or building meal plans based on body type, activity level, and fitness goals.
- [Rep Max](/skills/rep-max/index.html.md): Use when estimating one-rep max (1RM), converting between weight and rep ranges, or calculating training loads from a validated percentage-of-max table.

## Python Library
- [Calculating Body Composition](/library/body-composition/index.html.md): Python library guide: Body Composition
- [Macronutrient Assignments](/library/meal-planning/index.html.md): Python library guide: Meal Planning
- [Estimating Rep Maximums](/library/rep-max/index.html.md): Python library guide: Rep Maximums

## References
- [Body Composition Equations](/skills/body-composition-equations/index.html.md): Reference for the Body Composition skill
- [Macronutrient Planning Reference](/skills/meal-planner-macro-tables/index.html.md): Reference for the Meal Planner skill
- [Rep Max Estimation Reference](/skills/rep-max-percentage-table/index.html.md): Reference for the Rep Max skill

## Optional
- [README](/readme/index.html.md): Project overview, API reference, and usage examples
- [Changelog](/changelog/index.html.md): Version history and release notes
- [Contributing](/contributing/index.html.md): How to contribute to the project