[Matty]

[ QUOTE ]
black people have faster mussle twitch fibers than white people.

[/ QUOTE ]I hope you aren't trying to defend the biological notion of race. It's true that some people with dark skin genotypes also have faster muscle twitch fibers. However, it is not related to their skin color. Alleles are inherited independently and there has been interbreeding among populations since before global changes allowed some populations to move north and develop lighter skin. This means that depending on what criteria you use to split humans into races, you will end up with drastically different results. If you do it by skin color (or other adaptations to being close to the equator), you end up with something totally different than if you did it by blood type (which puts Swedish populations as the same race as some African populations, and other African populations the same race as Italians and Greeks). Scientists tried very hard to split people up into biologically defined races for a long time, and draw conclusions about people based on things like skin color, but found it utterly impossible. Any introductory level textbook will go into this much more in-detail. Unless you live in Kansas.

Edited to add that you can't attribute the dominance of black athletes to genes. There is much, much more variation within a population than among populations. The primary reason there are more black athletes is because with the economic and educational opportunities presented to them, focusing on sports, and then defaulting to, say, the military is often the best choice. This is why you're recently seeing a lot of white Europeans (from poorer countries) lately in the NBA for example.