Does Exercise Really Make You Healthier? (Scientific American)

The Department of Health and Human Services (HHS) late this year released its new Physical Activity Guidelines for Americans, calling for adults between the ages of 18 and 64 to exercise moderately (such as brisk walking or water aerobics) for at least two hours and 30 minutes or vigorously (running, swimming, or  cycling 10 mph or faster) for at least an hour and 15 minutes weekly. [More]
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