WRAL.comStrong sales, but high abandonment for fitness trackersWRAL.comAlthough sales of Fitbit and other fitness trackers are strong, many of their owners lose enthusiasm for them once the novelty of knowing how many steps they've taken wears off. One research firm, Endeavour Partners, estimates that about a third of ...How Fitbits are changing the fitness worldVidette Onlinetất cả 85 bài viết »