Here's a fact that is difficult to swallow: ethnic groups differ in many ways, i.e. the races of human beings are different in many ways.
As Simon said, there's athletic ability. Mean percentage of fast-twitch muscle fibres vary according to ethnic group. Among average people, there's lots of overlap so it doesn't mean much. At the tail end of the distribution, however, it means much more. That's a big factor why elite sprinters of white, Indian and Asian origin are no match for elite sprinters of West African origin. No white or Chinese sprinter will break Usain Bolt's 100 and 200m world records. Sorry folks, call me racist but it ain't gonna happen. XD
Mean percentage of fast-twitch muscle fibres is highest among West Africans. But this doesn't mean that West Africans are superior human beings, they are just more likely to be the best sprinters.
Mean bone density varies among ethnic groups. Sub-Saharan Africans' bones tend to be denser than Europeans'. That's one factor why you don't see many black swimmers winning medals at the Olympics.
East Africans (as opposed to any other ethnic group) excel at long-distance races. I'm not too sure about the details - either they have greater relative lung capacity or they are better than other groups at transferring oxygen to their muscles. Result: the world's best marathon runners originate from East Africa. But this doesn't mean East Africans are superior human beings, they're just more likely to excel at marathons.
Mean IQ also varies between ethnic groups. This is a very sensitive subject. Anyone who wants to explore this subject is typically deemed 'racist' and has their funding withdrawn. But there is variation re mean IQ. 'Orientals' (Asians in the US - ethnic Chinese, Japanese) and Jews typically score highest. Their mean IQ is approx. 115. Whites' mean IQ is approx. 100. Then Latinos have their mean IQ. Then native Americans and African-Americans have their respective mean IQ scores. The mean IQ for African-Americans is approx. 85. The mean IQ for South African Bushmen is less that 60. There is a trend, that trend being: mean IQ increases the further you move away from the equator. Like I've repeatedly said in this comment, this doesn't mean that Asians and Jews are superior human beings. It just means that these two groups are over-represented in intellectual fields such as astrophysics, engineering, computer science (Chinese) and poetry and script-writing (Jews).
We are all members of one species, Homo sapiens. We are all unique individuals with our own talents, skills and flaws. Each of us deserves the same dignity and treatment as human beings.