Can you run too much?

A Kansas City doctor and former marathoner discusses research on the potential effects of extreme running. This video originally published Oct. 13, 2016.
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A Kansas City doctor and former marathoner discusses research on the potential effects of extreme running. This video originally published Oct. 13, 2016.

Question hangs over extreme runners: Can too many miles hurt the heart?

October 13, 2016 11:52 AM