How Do Marathons Affect Your Heart?

Thu, 1 Oct. 2009 - 5:28 a.m. MT

Do marathons harm your heart, or do you good? It's too early to tell, but the evidence both ways is intriguing.

http://well.blogs.nytimes.com/2009/09/30/phys-ed-how-do-marathons-affect-your-heart/

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