[NuZZ]

I think he was after information concerning the heart and running as join degradation from running is, afaik, common knowledge. I was under the impression running improved heart strength.

http://www.pponline.co.uk/encyc/heart-attack-risks-are-great...

Such articles state that endurance running (as opposed to sprints) , or any edurancy activity, increase heart attack chance.

No exercise is purported as the greatest heart risk, so perhaps high intensity low endurance is best for heart health? I'd imagine it wouldn't build stamina.