fitness trackersThe information you get from “fitness” bands may be off by as much as 40 percent, according to Gregory Welk, an Iowa State University kinesiology professor, who tested seven of them. The top two bands were off just over 15 percent and the worst one was off 40 percent. There were $1.4 billion worth of these fitness trackers sold last year and the market continues to be hot. Professor Welk admits they’re still a valuable tool to achieve fitness.

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