I'm a keen gym junkie. According the website, it seemed to be a big improvement on my previous Polar device. BE CAREFUL. It doesn't work without a chest strap if you do any work with your hands on the floor e.g. Burpees or High Plank Ankle Taps. This is because the device moves around on your wrist and misses your pulse frequently. I was advised by Polar to get a chest strap and this has removed the problem totally. However it emphasises the unsuitability of the Unite for this type of exercise.
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Polar is a leading provider of heart rate and fitness assessment technology.