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Don't Mix Exercise With Work

Sitting for hours every day can be harmful to your health, but before you trade in your desk chair, here's something to think about: One study found that doing physical activities while working, like using a treadmill desk, may reduce your efficiency. You may not realize how much mental energy you're devoting to keeping yourself balanced. Plus, research from the University of Waterloo in Ontario, Canada, revealed that people who sat on exercise balls were unlikely to have better abs or posture than those who sat in chairs.