Popular fitness trackers like Fitbits, Apple watches and Nike bands may not assist users with weight loss, according to a study published in the Journal of the American Medical Association Tuesday.

Millions of people now start their day with a number—a "readiness" score, a "body battery"" level or a measure of "strain""—delivered by the wearable device on their wrist or finger. But how much ...

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Whether you're training for a race or just want a gentle nudge to be more active, these are the best fitness wearables for ...