Testosterone is a hell of a lot of the explanation though. When people inject more testosterone they get a hell of a boost to muscle development and strength.
Although past sexual selection may have led to women being smaller and having less testosterone and ability to develop muscle mass, it does not change that women are indeed smaller and have less testosterone and ability to gain muscle mass than men, leading to the average woman being slower and physically weaker than the average man. My replies have been directed at the assertion earlier that men only hold records because of outliers, and the average man and woman are close in strength and speed, but that is just not true.