Free tools

The engine, unchained

These run the same deterministic, safety-checked code that powers the Kalyra app — right here, free, no signup. They exist because they're genuinely useful, and because the best fitness tools should be.

Workout GeneratorPick goal, time, equipment → a real 4-week program with every session laid out. Not a random list — the validated engine output.Substitution FinderAny exercise + your constraints (knees, shoulders, pregnancy, quiet apartment) → safe same-pattern swaps with cues.Training Volume CalculatorHow many working sets per session and per muscle per week — and the recovery caps most plans ignore.