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How to wear your A370

A370 continuously measures heart rate from the wrist, in everyday-wear and during exercises. To get accurate heart rate readings, find a comfortable fit for your wrist by following these tips.

In everyday-wear, secure the wrist band on top of your wrist, behind the wrist bone. Do NOT place the fitness tracker on top of the wrist bone. The band can be slightly loose as long as the sensor on the back is touching your skin and stays in place when you move.

Tighten the band a little bit when you start a training session, so the sensor will not move when you exercise. The wrist band should not be uncomfortably tight either. Remember to loosen the wrist band after training for a more comfortable fit.

If you have tattoos on the skin of your wrist, avoid placing the sensor right on it as it may prevent accurate readings.

Also it's a good idea to warm up the skin if your hands and skin get cold easily. Get the blood going before starting your session!

In sports where it's more challenging to keep the sensor stationary on your wrist or where you have pressure or movement in muscles or tendons near the sensor, we recommend using a Polar H10 heart rate sensor with a chest strap to get better measurement of your heart rate.

Follow your heart rate zones directly from your device and get guidance for training sessions you've planned in the Flow web service.

Although there are many subjective clues as to how your body is doing during exercise (perceived exertion, breathing rate, physical sensations), none of them are as reliable as measuring heart rate. It is objective and is affected by both internal and external factors - meaning you will have a dependable measure of your physical state.