Worldwide sales of fitness trackers increased from US$14 billion in 2017 to over $36 billion in 2020. The skyrocketing success of these gadgets suggests that more people than ever see some value in keeping tabs on the number of steps they take, flights of stairs they climb, time they spend sitting, and calories they burn. The manufacturers of these devices certainly want consumers to believe that tracking fitness or health-related behaviors will spur them to increase their activity levels and make them healthier. Our analysis of research published over the past 25 years suggests otherwise. We are professors of kinesiology…

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