An easy way is to grow some tits - sponsors have a much more open policy for girls who ride.
Now, I know that sounds gay, but it is just a simple reality that the girls that ride, even the good ones, aren't nearly as good as the unsponsored male riders... I also have a ton of respect for girls who ride. I also think it is GOOD that sponsors are giving girls some support. But, there are very few girls who can hold their own on the dance floor and none would be likely to break top ten in the expert class.
I'm rooting for Nena though.
EDIT: Oh, and Erin Dinato kicks the butts of many in flatland. Much respect and props.