I think if you were born a man then you race in the men's class. If you were born a woman you race in the womans class. I dont really know much about her but by reading the posts above she is 30 years old and was a man the first 20 years. So, like Maelstrom said, she had 20 years to have mens muscle/heart/lungs etc..I dont know, its kind of like if somebody in the NBA got sick of not being the best in the league so they got a sex change so they could play in the wnba. Now, I am not saying she did this to be good in womens downhill, but you should know what I am getting at