Add Yahoo as a preferred source to see more of our stories on Google. The Fitbit app is free to use, but Fitbit Premium adds additional features to the tracker. You can pay for Fitbit Premium on a ...
Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. The Fitbit app will ...
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