Sports: Conditioning - Can't Quit Running

If you can't quit running, perhaps this is why.  Endurance athletes freely admit being addicted to working out.  Scientific research has suggested, "that rhythmic continuous aerobic exercise can produce narcotic like chemicals in the body."  Additionally, recent research suggests that those same chemicals may have encouraged humans to evolve into long distance runners.  So, not only do our minds crave the runner's high, but our bodies may also encourage it. 

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NPR Topics: Your Health