When you exercise, your brain releases chemicals called endorphins that produce a feeling of euphoria - the so called "runner's high" that people can become chemically addicted to. Without it, you feel irritable and out of sorts till you exercise again. So you go on exercising, never stopping to listen to what you body is saying. And what its saying is, "Stop." The reason exercise addicts keep pushing themselves probably lies in what happens when they don't work out. Psychologists at the University of Massachusetts at Boston studied the psychological consequences of being unable to exercise. They compared 30 male and female runners who had been laid low by minor
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You know it's bad when the Surgeon General issues a warning that lack of exercise is hazardous to your health. And that was back in '96. Since then, the stats haven't improved much, either: 25% of the American population is still sedentary and 60% do not exercise regularly (Reference: http://www.cdc.gov). For fitness minded folks, we could do worse than to follow the "hour-a-day" prescription outlined by the Surgeon General's Healthy People Report. It's just a guideline, of course and, as you already know, any amount of activity packed into
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