Tennis video analysis, from a clip on your phone.
Film a serve on the baseline, open it on your laptop, and have the trophy position measured, marked up and sent to your player before they leave the court.
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What the readings tell you in tennis
33 body landmarks tracked in your browser, with joint angles measured in degrees on every frame. Motion phase and footwork readings are quick landmarks, not scored judgments — the coaching is still yours.
Shoulder and elbow angle at trophy
The racket-arm elbow and both shoulders are measured in degrees on every frame, so you can show a player that the arm collapsed before the drive-up rather than telling them it felt early.
Knee flexion through the load
Both knees are tracked through the leg drive. Useful for the server who is jumping forward instead of up, where the difference is visible in the knee angle a few frames before contact.
Stance and balance at the split step
Stance width and whether weight is centred are read from ankle and hip position. Treat them as a quick landmark for recovery footwork, not a score.
Motion phase on swing strokes
Phases are estimated from limb trajectory, which suits the strike-based motions tennis is made of — serve, forehand, backhand, volley.
Moments coaches stop the tape on
- 01Serve: toss height, trophy position, pronation and landing
- 02Forehand: unit turn, lag, and contact point relative to the front foot
- 03Two-handed backhand: shoulder rotation and whether the non-dominant arm drives
- 04Split step timing against the opponent's contact
- 05Recovery footwork between the baseline and the service line
Filming tennis so the tracking holds
- Shoot from side-on at roughly waist height for serve mechanics — behind the baseline flattens the toss and hides the shoulder line.
- Keep the whole body in frame including the feet. Pose tracking needs the ankles to read stance and balance, and a cropped foot costs you the footwork read.
- A fence post or net post makes a reliable mount. Handheld footage drifts, and drift reads as body movement.
- For comparison work, film from the same spot every session. Two clips anchored at contact only line up if the camera did too.
Tennis questions, answered.
Can I compare a player's serve to a pro's?
Yes. Open both clips in Compare, set an anchor on each at the same moment — contact is the usual choice — then link them so they scrub and play as one. You can draw on both panels and record a voice-over across the pair.
Does it work for doubles and net play?
Pose tracking, joint angles and footwork read the same way at the net. Motion-phase detection is tuned to swing and strike motions, so it is most useful on serves and groundstrokes rather than on a reflex volley exchange.
Will it track both players in a rally?
Tracking follows one body. For rally footage, zoom and reframe onto the player you are coaching — the zoom and drag controls are there for exactly this.