This headline and article may be right in spirit, but are obviously wrong in letter. And we do ourselves a disservice calling this oversimplification news. If you run/bike/whatever too hard for too long, you die. Plain and simple. Obviously, almost no one reading this article would ever be in danger of doing such a thing, but there is obviously an upper bound to how much exercise a human can perform. For those who don't feel like reading the article, the claim is that running is good for you, and that those who claim running too much can harm your health are wrong.