This just in: ultra-marathons are not healthy. I'm perpetually amazed by the inability of people -- especially Americans -- to distinguish between sport and e

This just in: ultra-marathons are not healthy. I'm perpetually amazed by the inability of people -- especially Americans -- to distinguish between sport and exercise. There's a rich body of literature tying high injury rates (unsurprising) and metabolic dysfunction (more surprising) to extreme competitive sports.