Athletes at the world record level have a team of doctors, nutritionists, trainers, chefs, physical therapists, etc, etc.
Everything must be maximized to gain any possible edge
It helps to have your upper thorax look like a car radiator, head shaped like a pinhead and a giant air opening in your head, arms should look like pipe cleaners, and legs should be thin and springy like a pogo stick.
Shaq O’Neal will not break the mile record