Theres this guy who workout down my gym. He must be in his late 50s. He used to cum in and do like 2 hours of cardio every other day without fail and some light lifting afterwards only stopping for bannanas and water every so often. But check this out...he had a stroke 6 wks ago and is paralised down one side.
My point is, how fit do you have to be before this sort of thing wont happen ?
Maybe he had other problems or maybe he was pushing himself to far. Just goes to show you that no mattewr how fit you think you are it can still happen to you.