Men have higher upper body strength than women.Differences?
There are differences between every single individual and all the others! This is not a profound realization, nor a basis for very much in and of itself.
And, 'improve' on what? Every person is perfect...
...at being that person.
etc.
the list is long.
Different races have different strengths and weaknesses.
Ever wonder why few blacks play hockey yet so many play basketball?