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A. Absolutely. Although the U.S. Department of Health & Human Services recommends that adults ages 18 to 64 get at least two and a half hours of physical activity every week, even a few minutes of daily exercise, here and there, adds up. Some experts say you can avoid yearly weight gain by burning just 100 more calories a day—that's doable by walking at a steady pace for just 15 minutes. Bottom line: Some exercise is better than none.