I just read an article on the site stating that excessive cardio is damaging to your health. Overall I think this is probably correct and makes sense to me. In that article, Mark compares the body of a typical marathon runner to the typical sprinter. I think that he used two extreme examples to illustrate a point. However, I have a specific case I want to bring up. A man named Dean Karnazes. He is "ultramarathon" runner. And yet when you look at images of him, he doesn't fit that stereotype that Mark brought up. I read an article on him a few years ago in Wired magazine, and he doesn't just do excessive cardio, he does ultra excessive, to the point of his feet bleeding from blisters. And yet his body looks like it has plenty of lean muscle mass.
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