Why are my repetitions not recorded or only recorded incorrectly?

Before you continue reading, please check if your sensor has the latest firmware installed, and you are using the provided Vmaxpro Barbell Strap. Furthermore, many users suspect there are connection issues when using Bluetooth, but we can assure you there are not.

Like any other measuring device, the measurement technology within an IMU (the technology at work in our sensors) only works reliably within a defined range. Due to environmental influences, impacts or strong vibrations, it can happen that measuring ranges are exceeded within the sensors. These out-of-range conditions cause the measured values to drift and lead to large deviations in the output data or even missed repetitions. 

In the following, we show most frequent causes and suggested solutions in this context.

1
The minimum distance defined for the exercise and athlete is set too high. Lower it at least 10 cm (4 inches) below your average distance, which you typically cover in this exercise. This setting is there so that, for example, lifting the barbell out of a rack does not generate a repetition.
2
Trap Bar Article
3
If the velocity falls below a certain threshold (around 0.10 m/s), this can no longer be measured by the sensor and the repetition is considered complete. If the minimum distance has not been exceeded by then, no repetition will be registered. This usually only happens with 1RM attempts.
4
Only one or a few repetitions of a set are recorded each set. The reason are in 99% of the cases impacts on the barbell or strong vibrations caused by wobbly iron plates. Probably the best example here is the deadlift. When in doubt, try to let each repetition stand for itself by leaving a pause of up to 2 seconds between them while looking for the whistle icon in the top right corner of the view. Pay attention to what you do with the barbell and the sensor before the start of a set. The data can drift if the barbell is rolled before lift off or the hook of the rack is hit.
5
Whenever things felt off throughout the training, we had good experiences with reconnecting the sensor. Also, you can do what you normally do in the initial calibration without being in the guided calibration. By placing the sensor on each side for 3 seconds at a time, you can override the current calibration manually. This can also fix certain states of the sensor.

Please note

If all the above tips do not lead to any improvement, you can always contact us. The more information you provide, the more likely it is to find a solution. Most helpful is usually a video where the problem occurs. But also data exports or screenshots can help to find a solution. If none of these are an option, we should at least know which exercises the issues typically occur on.

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