This Is What Happens to Your Body When You Run a Marathon

April 20, 2015 5:36 PM

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This Is What Happens to Your Body When You Run a Marathon

The 35,000 runners who line up for today’s Boston Marathon can expect their bodies to take quite a beating from the 26.2-mile endurance test.

"Everyone has pain," said Dr. Lewis G. Maharam, the chairman of the International Marathon Medical Directors Association. "It's part of the deal."

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