# NinaPro DB5 — S2S Physics Certified (v1.7.0)
Physics-certified windows from the NinaPro DB5 forearm EMG+IMU dataset.
Each window validated against **8 biomechanical laws** using the
[S2S Physics Certification engine](https://github.com/timbo4u1/S2S).
## Why this exists
Standard NinaPro DB5 gives you raw EMG and accelerometer data.
This version tells you **which windows are physically valid** before you train on them.
Training on physically impossible motion data corrupts your model.
S2S finds it in milliseconds.
## What's added per window
| Column | Description |
|---|---|
| `tier` | GOLD / SILVER / BRONZE / REJECTED |
| `score` | 0–100 physics compliance score |
| `laws_passed` | Which of 8 laws passed |
| `laws_failed` | Which laws failed |
| `verdict` | Human-readable quality statement |
| `recommendation` | Actionable engineering guidance |
| `wavelet_signal_type` | biological / mechanical_synthetic / random_noise |
| `wavelet_cv` | Energy drift (real human: 0.15–1.5) |
| `…
