WorkoutReplayAnalyzer: Form Check AI
Analyzes phone videos of gym workouts to detect form issues, provide real-time coaching cues, and track progression — for solo lifters without access to personal trainers.
The Problem
Most gym-goers lift alone and have no way to verify their form is correct, leading to injuries, plateaus, and wasted effort. Hiring a trainer is expensive ($50-150/session), and general form guides on YouTube don't account for individual body mechanics or current fatigue levels. Lifters need instant, personalized feedback between sets.
Target Audience
Self-taught lifters and gym enthusiasts (ages 18-45) who train solo, particularly in underserved markets without quality coaching access. Secondary: home gym users who want accountability without paying for coaching apps.
Why Now?
Vision models (MediaPipe, Claude Vision) are mature enough to run cheaply on-device or cloud. Gym culture is booming post-pandemic, and lifters increasingly record workouts; they just lack tools to act on those videos.
What's Missing
Existing coaching apps require human trainers or only give generic cues. No app currently does automated, lift-specific form scoring from video without a person reviewing it. Lifters record 100s of reps but have no way to flag which ones were technically poor.
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