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Many people exercise far too little, but many others exercise far too much. Often obsessed with increasing their strength, stamina, and cardiovascular fitness, these zealous exercisers work out to the point of jeopardizing their physical and mental health. The question is: How much is too much? The American College of Sports Medicine recommends aerobic exercise for up to 60 minutes at least three times a week to maintain fitness. Less clearly defined, however, is the other end of the exercise spectrum -- Th