I still need to pair to an external polar HR strap as the optical sensor on my Galaxy watch is literally only useful for resting heart rate. Totally erratic or no reading during actual exercise. I have given up and gone back to my old polar M400 for any exercise monitoring. This means that the Galaxy watch and s health app never get to capture my real workload making it useless. I have because of this totally given up on the s health app as well. Pity as it's a great idea.
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