Sleep trackers use an algorithm to estimate how much time you spent asleep based on body movements.
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Despite the appeal of sleep trackers, they could cause unwanted anxiety for some.
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Gadgets that tell too many people to go to the doctor are a worry, but the growing enthusiasm for health monitoring should be encouraged.
Fitness makes the heart rate slower, which appears to be better for health and longevity.
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The adult heart rate should be between 60 and 100 beats per minute,but lots of factors can affect this.