x-coach
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Squat analysis in the web app: skeleton overlay and fault timeline on the video, rule-detected faults with their cited causes and risks, and Lumen's grounded explanation on the right.
x-coach is an AI coaching research prototype. It analyzes exercise form over a 16-movement biomechanics knowledge graph, connecting video perception, rule-based biomechanics checks, lightweight classifiers, and local retrieval over project knowledge so visual signals can be turned into explainable coaching feedback. (Video analysis covers 14 of the 16 movements today, all in Beta; the knowledge graph and in-app Explore browser span all 16.)
What This Project Does
- Extracts pose landmarks from squat videos with MediaPipe or RTMPose-compatible outputs.
- Builds pose-only and VideoMAE feature representations for labeled squat clips.
- Trains lightweight video-level classifiers for squat error labels.
- Builds REHAB24-6 repetition-level skeleton features and correctness classifiers.
- Detects technique faults with interpretable pose rules for 14 movements (Squat, Overhead Press, Push-up, Lunge, Deadlift, Row, Band Pull Apart, Bicep Curl, Arm Abduction, Arm VW, Sit-up, Shoulder Bridge, Leg Abduction, Torso Twist). Every detector is marked Beta; Jumping Jacks and High Knee have detectors that are deliberately not registered because no rule showed signal on labeled data.
- Builds and queries a local RAG index from project notes, documents, and knowledge-graph content.
- Provides knowledge-graph utilities for extracting, cleaning, auditing, and querying multi-movement biomechanics concepts (16 movements across 5 flagships + 11 general stubs).
Project Layout
src/pose/ - pose extraction, pose features, view estimation, and rule detection.src/video/ - VideoMAE feature extraction and video-level classifiers.src/knowledge/ - knowledge graph, retrieval, and local RAG utilities.src/rehab24/ - REHAB24-6 manifest, feature extraction, fusion, and correctness classification.scripts/pose/ - pose pipeline and pose-analysis entry points.scripts/video/ - VideoMAE and classifier experiment entry points.scripts/knowledge/ - knowledge graph and RAG entry points.scripts/rehab24/ - REHAB24-6 experiment entry points.backend/ - FastAPI web service wrapping the pose/rules/retrieval pipeline (see backend/README.md).frontend/ - React + Vite (yarn) dashboard: skeleton overlay, fault timeline, GraphRAG feedback (see frontend/README.md).data/ - datasets, labels, processed poses, features, and cached RAG assets.demo/ - browser demo assets and pose-estimation prototype code.docs/ - longer walkthroughs.notes/ - research notes and experiment summaries.tests/ - Python unit tests (pytest) for core behavior and analysis helpers. Frontend tests are Vitest, under frontend/ (yarn test).
Data Areas
data/Squat/Unlabeled_Dataset/ - raw unlabeled videos and extracted pose JSON.data/Squat/Labeled_Dataset/ - labeled clips, split files, labels, pose JSON, pose features, and VideoMAE features.data/kg/ - knowledge graph files and canonical mappings.data/rag/vector_db/ - local RAG chunks, embeddings, and manifest.
Setup
Create and activate a Python virtual environment, then install the project requirements:
pip install -r requirements.txt
Set GOOGLE_API_KEY only if you plan to run Gemini-backed knowledge-graph extraction.
Docker (web app)
The backend and frontend also run as containers — no local Python or Node needed:
cp .env.example .env # every value is optional; blanks degrade gracefully
docker compose up --build # app on :8080, API docs on :8000/docs
Add -f docker-compose.dev.yml for hot reload (Vite on :5173, uvicorn --reload). The
research pipelines under scripts/ are not containerised — they need the full
requirements.txt and the datasets, so use the local .venv. Details: docs/docker.md.
Running Workflows
Command details live with the script directories:
Documentation
Project Goal
Support explainable coaching feedback — rule-based analysis of 14 movements today, over a 16-movement biomechanics knowledge graph — by linking visual signals, structured biomechanics knowledge, and retrieval-based guidance.
