[drothamel]

Well, this isn't a human athlete, but when Secretariat died, they performed an autopsy and found that Secretariat's heart was twice the size of the average horse heart. Obviously, that would help in the oxygenation of the muscles. I thought that was pretty interesting.

As for Lance Armstrong, he is almost superhuman. To do what he has done 6 times and probably a 7th is incredible. That race is a true test of human endurance. He has to be considered one of the greatest athletes in history.