6. Fitness Trackers May Be Actively Hurting Your Fitness
Fitness trackers keep track of how long you’ve been working out, and your heart rate, and the number of steps you take in a day, all while coming in a conveniently small, conveniently $200 package (which you’ll lose in a drawer in a month). And that sounds pretty harmless, even useful. Who doesn’t love data? Well, what if the data isn’t accurate? A study of a pair of Fitbit products found that they miscalculated heart rates by up to 20 beats per minute, and that they got worse as the exercise got more intense. You may recognize intense exercise as the time when it’s most important for a tracker to get an accurate reading, since you don’t really need that much monitoring when cramming Cheetos in your mouth and yelling at Wheel Of Fortune. A second study found an average error rate of 14 percent — a margin that doesn’t just make the product useless, but dangerous to someone who has heart disease and needs to know precisely how much their ticker is ticking.
OK, but what about their main purpose, reminding you to exercise every day? Yeah, so … another study found that while wearing a fitness tracker does make people take more steps in a day, every step is as begrudging as a child choking down Brussels sprouts. Exercise stops being fun and becomes a chore you hate. And well, that both sucks and is entirely predictable, but isn’t the end result still good? Exercise is good for you regardless of whether you like it or not. Except, as you’ve probably now guessed, fitness trackers don’t appear to help you stay fit either. Yet another study took 470 overweight young adults and put them on a low-calorie diet and exercise program. Half self-reported their exercise, while the other half used a tracker. And the group with the trackers lost less weight.