Open-source AI Strength & Conditioning coach for your terminal. Runs in Claude Code / Gemini CLI / Codex — the LLM narrates, a deterministic engine calculates, and it won't lie about unrealistic goals
🏋️ The first open-source AI Strength & Conditioning Coach powered by scientific research.
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It runs inside an AI agent CLI — a terminal program you chat with, such as Claude Code, Gemini CLI, or Codex — and turns it into a professional coach that designs, explains, monitors, and adapts your training. No backend, no API key, no hosting, no extra subscription. And it will tell you the truth when your goal is unrealistic:
Why another AI fitness coach? Because this one can't lie to you
LLM fitness coaches have two failure modes: they invent scientific references, and they tell you what you want to hear. PerformanceAgent is architected so neither is possible:
- LLMs narrate, the engine calculates. Every number — feasibility probabilities, race predictions, training loads, periodization waves — comes from a deterministic, property-tested Python engine. The agent explains the math; it never does the math. - Citations can't be hallucinated. The coach may only cite studies returned by the local evidence corpus (graded, DOI/PMID-verified). The PDF renderer hard-fails on any reference that isn't in the corpus. - Your data is files, not a cloud. Profile, programs, session logs, and check-ins live in a plain directory of markdown/YAML you can read, edit, diff, and sync.
PerformanceAgent isn't an app you open — it plugs into an AI agent CLI. Once plugged in, you just talk to it in plain language; no config files, no commands to memorize.
From the project README.
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