The Terrifying Hell A Marathon Inflicts On The Human Body

The 118th annual Boston Marathon is about to get underway, and like any marathon, it will be an incredible physical tax on all of its participants. There will be heart trauma, organ damage, blood pissing, unspeakable chaffing—and those are the baseline. Below, read Dr. Matt McCarthy's explanation from this past October of what it is, exactly, that a marathon does to your body.