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If you have a Fitbit, or if you use the Fitbit app with a compatible device like a Pixel watch, you’ve probably seen “zone minutes” or "active zone minutes" pop up on your screen. So what exactly are active zone minutes, and how do they compare to the other ways we measure exercise, like steps?

Zone minutes relate to the U.S. Physical Activity Guidelines

Before we get into how zone minutes are measured, I think it will be most useful to look at why we’re counting up minutes at all. Fitbit’s purpose here is actually pretty neat: They’re trying to give you an automated way of telling whether you are keeping up with public health guidelines for exercise, like the World Health Organization’s recommendations for exercise, and the Physical Act

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