July 24, 2026 • Dzianis Vashchuk • 8 min read
How AI Rep Counting Works: Pose Detection + Multimodal LLMs
How an AI rep counter actually works: on-device pose detection extracts joint keypoints, a joint-angle state machine counts reps, and a multimodal LLM watches the annotated video to correct form. The pipeline, the tradeoffs, and the honest limits.