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If you have darker skin, shuffle when you walk, or regularly push a stroller, it can throw off the data. Commercial fitness trackers are being used for all kinds of things other than tracking steps. In the lab, when subjects jogged or walked normally, the devices undercounted steps 50 percent of the time, compared with observed steps. If you’re an employer wanting to promote step-counting as fitness, know that all people’s steps are not counted equally equally.