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FILE - In this Dec. 15, 2014, file photo, fitness trackers, from left, Basis Peak, Adidas Fit Smart, Fitbit Charge, Sony SmartBand, and Jawbone Move, are posed for a photo next to an iPhone, in New York. Although sales of fitness trackers are strong, many of their owners lose enthusiasm for them once the novelty wears off. (AP Photo/Bebeto Matthews, File)

FILE - In this Dec. 15, 2014, file photo, fitness trackers, from left, Basis Peak, Adidas Fit Smart, Fitbit Charge, Sony SmartBand, and Jawbone Move, are posed for a photo next to an iPhone, in New York. Although sales of fitness trackers are strong, many of their owners lose enthusiasm for them once the novelty wears off. (AP Photo/Bebeto Matthews, File)

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