" The female runner still lags behind the male, and blame rests on the pelvis. The projections on the man’s pelvis allow for more powerful muscles, but a woman equipped with them could not bear a child. Similarly, a man’s hip sockets are closer together, nearer the center of gravity, which enables more efficient movement. If a woman’s were similarly designed, there would be no room for the baby’s head to extrude. So the odd pelvic bone represents a summation of many different requirements. When a woman wishes she could run faster or sway less or have a narrower base, let her know that the survival of the human race depends upon her being just the shape she is. "

― , Fearfully and Wonderfully Made