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Many devices also measure heart rate and sleep.I speak from experience, having worn as many as seven trackers simultaneously to test them out.COUNTING STEPS Fitness trackers typically use arm swings to gauge how far you've walked or run and push you to reach, say, 10,000 steps a day. Some devices, like the Apple Watch, will also step up your goals as you improve.FOR WORKOUTS These devices are awful at translating steps to miles, and very few let you calibrate your tracker by checking it against a known distance.Most GPS fitness trackers also aren't as versatile as a GPS device fine-tuned for running, cycling, golfing or whatever your sport is. A tracker lacking sports-specific features can still be useful. You might run three miles with a GPS-running watch and use the tracker to make sure you're not sitting the rest of the day. While a tracker might deem you a light sleeper, it can't guide you to better sleep.A tracker could still be a worthwhile investment for some people.
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