Building Real-Time Workout Feedback with WebSockets

When building Bring The Shreds, one of the core requirements was real-time feedback during workouts. Users needed to see their rep count update instantly and receive form corrections without noticeable delay.

The Challenge

HTTP polling was too slow (200-500ms latency). Server-Sent Events were one-way. We needed bidirectional, low-latency communication for pose data streaming and feedback.

The Solution

WebSocket connection with a custom protocol: client sends pose landmarks at 30fps, server responds with rep counts and form corrections. Used Socket.io for automatic reconnection handling.