This is an uncomfortable topic for me to discuss because it's highly taboo in our society. I would encourage everyone to be civil and to not resort to name calling or anything of that sort.
Human races are basically an extension of a person's family. Meaning that, through inbreeding, certain traits became more prominent and through natural selection, some were weeded out and some remained in the gene pool. Look at dog breeds; even though they are all part of the same species, each dog breed has its own temperament and level of intelligence. I don't think this can be ascribed to simply environment; there's something else at play here.
Why can't this also apply to humans? The Africans who left their homeland were exposed to much more evolutionary stress than those that stayed behind. The unintelligent and uncreative were culled out. I don't want to believe this; I'd much rather think that all human beings are equal, but I can't stop doubting the philosophy of racial equality taught to us at school.
Asians and Jews have a higher IQ on average. Why is that? Is it due singlehandedly to culture? Unfortunately, there is a much more logical explanation; a tradition of planned marriages in both these communities led to a sort of inadvertent eugenics being implemented.
This is possibly why people of African descent are more athletic; the stresses of the Savannah meant if you weren't fit, you couldn't catch food, and therefore you died.
Still, this seems to be a very rigid way of categorizing people. Neil DeGrasse Tyson and Dave Chappelle are both very intelligent black men, but both their parents were doctors and university professors, respectively. Could this be due to environment? Maybe, but some people, no matter how good of an environment you give them, will never top an IQ of 105.
I've heard this line of reasoning being referred to as pseudoscience many times over, but nothing that the proponents of racial equality say is very convincing. I'm not 100% sure that what I said is true, but I think it's something to consider. We need genuine discussion over this issue instead of censorship and media lynching of anyone who has the audacity to question the status quo.