WorkoutReplay: AI Form Feedback from Videos
Upload gym workout videos and get instant AI feedback on exercise form, depth, and safety issues specific to your movement pattern.
The Problem
Most gym-goers either train alone without form feedback or pay $200+ for in-person coaching. Phone mirrors help but can't analyze biomechanics. Existing form-check apps are either manual (slow Discord communities) or generic (don't catch individual compensations).
Target Audience
Home gym users, budget-conscious gym members (18-45), fitness enthusiasts training without a coach, and remote workers wanting to avoid gym commutes.
Why Now?
Vision LLMs (GPT-4V, Claude Vision) now understand movement patterns well enough; mobile video uploads are frictionless; Gen-Z sees digital coaches as normal.
What's Missing
Existing fitness apps ignore form entirely or require expensive human coaching. LLM vision models are finally good enough to catch subtle form breaks (knee caving, excessive forward lean) at consumer-price scale.
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