Males generally can develop more strength than females because they are programmed with hormones to develop larger muscle-mass. Evolution, presuming that's what's operating here, seems to have decided that more limited muscle mass is a survival advantage for women and their children.

The reasons for this are open to speculation. But survival in hard times is perhaps one definition of physical fitness. I wouldn't be surprised if females averaged better than males at some aspect of physical performance other than strength, such as coordination.
But I personally don't know enough yet to make an assertion of it.

Statistically, women have a higher average longevity than men. I've heard there could be a biological tradeoff between longevity and muscle mass, given the present structure of the human body. Individual humans (male and female) have deliberately shifted their point on this balance using steroids. We have found that increased rate of heart attacks is actually one of the hazards of such steroid use. Nature may be faced with the same kind of problematic choice, using it's own natural hormones.

In my weekend training session for building female fitness, I just correct your body posture and face expression; and the female fitness is all yours!

You discover the real physical nature of your body that makes you feel fit instantly as a result of undergoing building female fitness program.

The only thing left, then, is to turn this personal discovery into your spontaneity - of body and mind; and the instant female fitness turns into the lasting female fitness for life!