Extreme exercise does have negative health effects. Here is one random discussion with some study links (found from a quick search): http://www.drjohnm.org/20

Extreme exercise does have negative health effects. Here is one random discussion with some study links (found from a quick search): http://www.drjohnm.org/2012/06/cw-its-settled-long-term-extreme-endurance-exercise-is-not-heart-healthy/ http://www.drjohnm.org/2012/06/cw-its-settled-long-term-extr...