A whole lotta madness is comin' out of this thread. A lot of facts are way incorrect, but some points have been made. Here's what I know as facts:
Blacks, at one time, were actually the best jockeys in the world until jealousy and racism locked them all out. Read 40 Million Dollar Slaves for proof.
ATHLETICISM
1) Athleticism is genetic, however...
2) Genetics are born mostly of environment and evolution. Human flesh adapted over generations spanning thousands of years to create certain groups of people that have certain physical genetic advantages adapted for the environment upon they dwelt.
3) If slaves were chosen for their ability to perform backbreaking physical tasks then it serves to reason that some people from certain regions of Africa were picked to be sold into slavery more than others due to conditioned genetic advantages.
4) Four hundred or so years of breeding amongst this highly specialized group would serve to enhance what innate physical prowess they possessed. Fortunately for them it's translated into shooting baskets and running footballs around for ridiculous amounts of money.
Movin' on.
STRENGTH
1) Northern European's dominance of the World's Strongest Man contests is also a system of factors. These are more cultural than genetic.
2) You do not need fast-twitch musculature to perform in them successfully. So anyone with a body big enough to support lots of muscle and a willingness to push lots of heavy stuff around airport hangars and backyards has a decent shot.
3) Pushing lots of heavy stuff around airport hangars and backyards is expensive. In fact, so are gym memberships, training facilities, and other necessary factors to competition in strongman contests. And since it's a highly specialized sport you also need access.
4) Blacks have money. Blacks also have a lot more access. But culturally people tend to gravitate to activities they know others like them have interest in. Basketball and football satisfy this, more or less, for Blacks in this country so few of them have interest in pushing lots of heavy stuff around airport hangars and backyards.
That said, my name is Kevin, I'm black, and yes I do have a big dick, or so I have been told. I hope this helps. The facts I mean. My dick too, of course, but that's an issue for another day. If I'm full of it, I welcome your opinion. Thank you.