There is a large disparity on ability at the base line of both genders. Why should a man or women have to work harder to compete against the opposite sex that is structured differently by nature. Weight distribution is a big one, it changes the center of gravity on the body. Example if you put a chair seat side against a wall and try to bend over the back (if it is between hip and waist height) a women will be able to touch the wall and a man will find it very very difficult.