Metric measures velocity by finding and tracking standard sized, regulation weight plates of 450mm diameter.
✅ Bumper plates, training plates, calibrated powerlifting plates (20kg/45lb and above) and old-school iron plates of 450mm diameter all work great with Metric.
❌ Plates with non-circular shapes will not be recognised by the algorithm.
❌ Plates that do not have a 450mm diameter will give incorrect results.
Metric precisely measure the change in position of the barbell. The recording device must be stationary to get a valid result.
Keep the phone upright (vertical orientation) while recording.
✅ Use a mini portable tripod, or rest the phone against a dumbbell, water bottle or similar stable object.
❌ Do not have someone hand-hold your phone as Metric records your set!
Metric needs to have a good side-on view of your weight plate throughout the set. Position the phone within about 20º of the end of the barbell.
For squats and overhead lifts Metric works best when the camera is raised off the ground. Try to use a tripod or position your camera on a bench or box.
✅ Position your phone within 20º from side-on to your lift.
❌ Do not place your phone front-on or at an extreme angle.
Computer vision works roughly like human vision: Metric needs to be able to "see" the weight plates in order to track your lifts with precision.
The more clearly it can see the weight plate in the video, the better the data from Metric will be.
Follow the tips below to ensure you get the best results.
Placing the phone around 5-10º in front of the lifter is perfect.
Recording with the phone too close, too far away, or cutting off a portion of the weight plates during a rep will lead to inconsistent data.
For squats, bench press and overhead pressing, Metric works best when your phone is at waist height or above. For deadlifts and rowing, the phone can be anywhere from floor to hip height.
Avoid bright lights pointing into the lens creating lens-flare, and avoid lifting in dark environments where it is hard to see the weight plates.
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