National guidelines urge all Americans to engage in "moderate physical activity" at least 2.5 hours a week, but what does that mean if you're out for a stroll?
A new study provides the answer: It's equivalent to a brisk walk, or about 1,000 steps every 10 minutes.
The U.S. formerly recommended that people get 30 minutes of moderate exercise at least five days a week. But last fall officials changed the guidelines to simply say that people should exercise 150 minutes a week.
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