TrainBud: Open-Source MCP Server Turns Your Fitness Data Into an AI You Can Ask From Your Wrist
Cr1tsh0t · reddit · 2026-09-08
The author open-sourced Trainbud, a free MIT-licensed MCP server for personal fitness data: npx trainbud setup wires it into Claude Desktop or Cursor, answering questions like "am I recovered enough to train hard tomorrow" from your own 28-day baselines.
- 14 tools covering activities, sleep, heart rate, recovery, body composition, stress, VO2 max, weekly reviews, plus a memory layer for goals and session feel
- Bonus Connect IQ watch app: the watch only renders JSON resolved server-side; an Ask card forwards wrist questions to your server, which calls the model
- Key design: thresholds grade server-side; findings are detected in code with the model only phrasing them; an unworn night is unknown, not a zero recovery score
- Constraints: self-hosted only, BYO Anthropic key, optional monthly cap, no MFA support
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