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Presumably, if you exercise then you'll have more days total in which to be productive (that is, you'll live longer)!

• kolev 14y ago
  Working out won't make you healthier. In fact, boosting your metabolism and gaining muscle mass is the sure way to getting cancer sooner.
• jlees 14y ago
  Plus, you might find yourself more productive on days when you have exercised. I certainly do.