User Guide

Getting started with Metric

Metric uses a unique computer vision system and rep-detection algorithm to analyse camera footage from a mobile device.

As with any measurement tool, you need to follow some simple rules to get the best results! Read the instructions below and you will be lifting with VBT in no time.

Metric is currently in Public Beta
We will be launching Metric in the App Store for iOS soon. Sign up to our newsletter to get on the waiting list!

How to set up your recording for Metric

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.

If the camera is moving around or doesn't have a good view of the weight plates Metric won't work!

Your environment also needs to be bright enough to clearly see the weights. If you train in the dark Metric probably isn't going to work well for you.

Follow the three setup tips below to make sure Metric works best.

1. Use regulation size (450mm) circular weight plates

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.

Illustration of bench press using regulation circular plates, and a warning to not use odd shaped plates.

2. Make sure the phone is stable and stationary

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!

Illustration of Front Squat with the users device correctly positioned on a tripod, and a warning to not use Metric hand held.

3. Position your phone side-on

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.

Illustration of Deadlift showing correct side-on framing when recording, and a warning with incorrect front-on camera position.

How to start a lift in Metric

  1. Tap the Record button from the Metric home screen.
  2. Select your exercise from the list, then enter your weight.
  3. Tap the Confirm button.
  4. The camera preview will appear. Make sure you are set up appropriately (see above).
  5. When your phone is correctly positioned and stable tap the record button and complete your set.
  6. Tap the stop button when your set is over. After the recording is stopped you can pick up your phone to review.
  7. Metric will automatically analyse your lift!

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