One Big Thing Fitness Trackers Haven't Mastered

One Big Thing Fitness Trackers Haven't Mastered
Vector fitness app on the screen of mobile phone and tracker on the wrist - illustration in flat style
Vector fitness app on the screen of mobile phone and tracker on the wrist - illustration in flat style

The American Council on Exercise (ACE) estimated that 19 million fitness trackers were in use last year. But, that doesn't mean they're all they're cracked up to be. According to a small, new study from ACE, these trackers may not be accurate at estimating calories burned.

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