Nick Bilton recently blogged about the suspect quality of fitness data provided by wearable fitness-tracker devices, reporting “the reality is that many devices claiming to monitor fitness and health probably over-promise and under-deliver.”

While intended to record data about such things as how many steps you have taken, how many calories you have burned, and how many hours of restful sleep you get, many of these devices, judging by Bilton’s personal experience, are often inaccurate.

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