🤖 Large Language Models

Claude Cracks a Gym App's API with mitmproxy—Then Builds Your Workout Exporter

Your workout app hoards your data—no exports allowed. But Claude, armed with mitmproxy, reverse-engineered the API and spat out a full CLI tool. Now AI coaches your gains.

theAIcatchup Apr 08, 2026 3 min read
Terminal output of mitmproxy capturing Liftoff gym app API traffic analyzed by Claude AI

⚡ Key Takeaways

  • Claude uses mitmproxy to fully reverse-engineer Liftoff's tRPC API without human packet reading. 𝕏
  • The resulting Go CLI exports workouts, stats, and bodyweight trends—installable via Homebrew. 𝕏
  • AI closes the loop: extracts data, then coaches training, hinting at personal data sovereignty era. 𝕏
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Originally reported by Dev.to

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