Endurance athletes sometimes say they're "addicted" to exercise. In fact, scientists have shown that rhythmic, continuous exercise — aerobic exercise — can in fact produce narcoticlike chemicals in the body.
Now researchers suggest that those chemicals may have helped turn humans, as well as other animals, into long-distance runners
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cliffelam: I prefer to think I'm just grooving on my late mid life crisis athlete.
Plus, I do have a 13 year old daughter so need to keep my running, lifting, and shooting skills up to snuff.