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Take the data with a grain of salt, because the number of steps and calories burned usually is not 100% accurate. Researchers at Cal Poly Pomona had study participants wear the four most popular fitness trackers while exercising: Apple Watch, Fitbit Charge HR, Samsung Gear S and Mio Alpha. And compared heart activity with the tracker data.

The result: Every device was pretty inaccurate. But the good news is, they UNDER-estimated activity levels – some by up to 43%! So, you’re probably getting more exercise than you knew.
And your tracker may not be giving credit where credit is due.

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