How to record a jump
Set up your phone, calibrate, and record bodyweight jumps with Metric Jump, no extra hardware.
Metric Jump measures bodyweight jumps from a front-on angle, with no extra hardware. It finds your body, detects the jump type, and reports height, impulse, takeoff velocity, reactive strength and more. Every number comes from your phone camera.
Metric Jump is a standalone app, separate from Metric Lift.
Position the phone
- Prop the phone on something stable. Use a tripod, a wall, or a bench. Any support that does not move mid-set works.
- Keep the phone upright. Position it between knee and stomach height.
- Step back. Stop when your whole body sits inside the on-screen frame guide.
Your jump leaves the guide at the top. That is normal. Metric Jump shows on-screen prompts to guide you.
Check the light and background
- Avoid heavy backlight. A bright window or a fluorescent strip behind you makes tracking harder.
- Avoid a dark room with dark clothing. Metric Jump has to see your whole body to track it and detect the jump.
Calibrate before each set
Before each set, Metric finds you in the frame. It tunes to your height and your distance from the camera. Calibration starts automatically after you step into frame and stand still. Metric Jump uses that calibration for scale and gravity, so the data reflects the real world.
- Stand tall and still in the middle of the frame.
- Hold the pose until the calibration ring completes, about 1.5 seconds.
- Jump after the ring clears.
After calibration, aim to take off and land on that spot for every jump. If you drift too far towards or away from the camera mid-set, the numbers lose accuracy.
Record your jumps
- Jump naturally. Do not shuffle or reposition your feet too far at takeoff.
- Take off and land on roughly the same spot each rep.
- For multi-rep sets, return to a tall stand between jumps. Let your score fade from the screen before the next jump.
Why the setup affects accuracy
Every metric comes from how your centre of mass moves on screen. If the camera cannot see your full body, or calibration is off, the maths has nothing solid to work from.
See Jump classification for how Metric labels each rep. See Jump metrics for what the numbers mean.