@Afroblanco: The ass serves basically no biological purpose; it's pretty much just there to be looked at.
Here are anatomical characteristics that are unique to humans and that play a role in helping people run, according to the study...Human buttocks "are huge," says Bramble. "Have you ever looked at an ape? They have no buns." He says human buttocks "are muscles critical for stabilization in running" because they connect the femur – the large bone in each upper leg – to the trunk. Because people lean forward at the hip during running, the buttocks "keep you from pitching over on your nose each time a foot hits the ground."
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