The distinctly pronounced butts found in humans are apparently integral to bipedal running. This makes butts an essential part of the human body's ability to stalk and chase game, which allowed our forebears sufficient calories to survive and breed in numbers great enough to survive the various catastrophes of Paleo- and Mesolithic history. We should all thank our butts for saving our asses.
The distinctly pronounced butts found in humans are apparently integral to bipedal running. This makes butts an essential part of the human body's ability to stalk and chase game, which allowed our forebears sufficient calories to survive and breed in numbers great enough to survive the various catastrophes of Paleo- and Mesolithic history. We should all thank our butts for saving our asses.
You can't assume the protective "river position" without a butt