Shoes, Ships, and Sealing Wax

Form Follows Function

In case you ever wondered why:

In fact, running seems to be the only reason that we have prominent buttocks, says Lieberman. He has measured the activity of the gluteus maximus muscle in volunteers during a walk and a jog. "When they walk their glutes barely fire up," he says. "But when they run it goes like billy-o."

I've always assumed my buttocks would be less prominant if I got off them and tried some long-distance running, frankly. Earlier in the article they mention "sturdy knee joints," though, and mine are sooo not sturdy.