My old phone is a 7+, the new one is the X. I backed up the 7+, restored to the X, and most apps have their data. However the Polar app Polar Beat, which has my running/biking history, comes up like a ...
Using a chest strap heart rate monitor can give you accurate, actionable insights to help improve your running. What is the best chest strap heart-rate monitor overall? The best chest strap heart-rate ...
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