Usually japanese women do better than men in international sports competetion.
I don't mean that japanese women run faster than japanese men or women football team is stronger than the men's team.
but i mean that japanese women got the first olympic gold medals in swimming, volleyball, figure skating and marathon earlier than japanese men as far as I know.
japnese women do better in tennis tour than japanese men.
In football, too, the women's team does well though only very small number of women play football in japan.
(generally, football was not popular untill only recently.
the (men's) professional league was established only 15 years ago. no women's professional league.)
My hypothesis is that sexual difference between men and women is smaller with the japanese (or mongoloid, in general) than with europeans or africans and this is the cause of the fact above.
Men do better in most sports when they are more masculine while women do so when they are less feminine.
According to medical research,
black girls have their first period earlier than others and then whilte girls and finally yellow girls, and
black men have largest balls and then white and finally yellow.
(length of poles may be a little difficult to measure.)
Of course, individual differences are large.
And ther should be more factors to decide success in sports.