komen's legs were so efficient he could turn a white, cheesecake eating 4:30 american miler into a 4 flat miler overnight. His chest capacity was also sick, did you ever take a look at that man's chest? He probably had a 3 gallon lung capacity. Now add those two factors together with the suffering of living in Africa and training your ass off at the very limits of human potential. Run a few 3's and 5's and there you have it.
f***ing pessimists