Guide
Forehand smash analysis guide
Badmi currently analyzes one recorded forehand smash: at the contact frame it measures relative contact height, elbow angle, and knee extension, emits up to three structured issues, then has AI explain those issues rather than re-score the shot.
How Badmi reads contact height, elbow angle, and knee extension from a recorded forehand smash, and which issues can appear in the report.
- Author:
- Badmi Editorial
- Published:
- Sep 1, 2026
- Updated:
- Sep 2, 2026
- Reviewed:
- Badmi Editorial · Sep 2, 2026
Badmi currently analyzes one forehand smash from a recorded clip. It does not coach live during play, and it does not invent an overall technique score. The flow is: check filming quality → estimate pose landmarks → find the overhead contact frame → compute three metrics → apply issue rules → let AI explain the structured findings.
How to think about the phases
In practice you can split the smash into ready position, backswing, swing, contact, and follow-through. Badmi’s structured checks focus on the contact instant: wrist height relative to the shoulder, elbow extension, and knee extension. Backswing timing, torso rotation, and racket face are not measured metrics today.
- Ready: a true racket-side profile makes the chain easier to see.
- Backswing: create space for an overhead hit; the system does not score the backswing alone.
- Swing to contact: contact height, elbow angle, and knee extension matter most.
- Follow-through and landing: useful for human review, but not current structured issue rules.
What is measured today
| Metric | Meaning | Related issue |
|---|---|---|
| Contact height vs shoulder | At contact, racket-side wrist height relative to the shoulder (torso ratio) | Contact too low |
| Elbow angle at contact | Shoulder–elbow–wrist angle in degrees | Elbow not extended |
| Knee extension at contact | Hip–knee–ankle angle in degrees | Insufficient knee extension |
What is not judged today
- No wrist snap or forearm pronation measurement.
- No racket-face angle or racket-head speed.
- No structured issues for body rotation amount or swing timing.
- No injury diagnosis and no replacement for in-person coaching.
How to use this guide
Film a clear side-view clip, then train the single highest-priority issue in the report before recording again. Prefer fixing contact height or extension gaps over changing many details at once.