User:Kristenzima/sandbox

Biological difference (this is not my contribution, my contribution is the one that says sandboxdraft)
Female athletes do not have the same level of athletic performance as male athletes. The study has shown that compared to females, males have more muscle, higher blood volume, and more red blood cells, and those differences can be 30% in individuals. Currently, male athletes have better world records than female athletes. Take the case of running, swimming and skating; each sport reveals the fact that male athletes' world record was about 10% more than female athletes' record. It is difficult for female athletes to compete against male athletes. In 1998, Karsten Braasch — the male tennis player who ranked at No.203 in the world beat Serena Williams 6-1 and Venus Williams 6-2 after the Williams sisters claimed that they are capable of beating any male player ranked outside the world's top 200. This also lead to the winners of the Grand Slam and named UNBEATABLE when she was just 20 years old.