When it comes to tracking your walking mileage, a smartphone is just as accurate as some fitness bands, a U. Penn study found.

Researchers tested 10 different fitness devices and smartphone apps and found that the average step counts from the phones were off by about 6%, while the fitness devices could miss the mark by as much as 22%.

Bottom line: Most devices were fairly accurate; phones just had less variability. So whether you use a mobile app or a wearable, keep on trackin'.

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