Four fitness trackers are shown in this photograph. They are, from left, Fitbit Force, Jawbone Up, Fitbug Orb, and the Nike FuelBand SE. The latest crop of fitness gadgets will record much more than how many steps you took on any given day. But a Duke University study now suggests that measuring output can decrease enjoyment and, ultimately, quantity.
Four fitness trackers are shown in this photograph. They are, from left, Fitbit Force, Jawbone Up, Fitbug Orb, and the Nike FuelBand SE. The latest crop of fitness gadgets will record much more than how many steps you took on any given day. But a Duke University study now suggests that measuring output can decrease enjoyment and, ultimately, quantity. Richard Drew AP
Four fitness trackers are shown in this photograph. They are, from left, Fitbit Force, Jawbone Up, Fitbug Orb, and the Nike FuelBand SE. The latest crop of fitness gadgets will record much more than how many steps you took on any given day. But a Duke University study now suggests that measuring output can decrease enjoyment and, ultimately, quantity. Richard Drew AP

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