HEALTHY LIVING

One Big Thing Fitness Trackers Haven't Mastered

02/26/2015 10:40 am ET | Updated Feb 26, 2015
venimo via Getty Images

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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