Wanted to come back to this, when I said sprinting is not natural, I think my statement was blown out of context. What I meant was that sprinting seems to be some kind of emergency function that is to be utilized to escape from some kind danger and it’s only in modern times that we have made a sport out of the use of this emergency function. However, just taking a cursory view, the human body was not designed to survive from sprinting alone as you see with the cheetah. If that were the case humans would be much faster over all, and I would imagine that tendons, energy systems, and so forth, would be much more highly developed on average.