I don't believe it is a race advantage. Anymore than finding a great scientist, philosopher, or artist has roots in race. There is no mecca of talent from one particular race that will determine success. That said, you can certainly find trends and there are reasons your question is valid.
Exposure to a sport, and the ability to pay for the resources to develop a young athlete are very influential factors. Soccer is the most popular sport in the world. Because all you need is a patch of grass and a ball. Raising a successful athlete in sports like hockey, swimming or tennis require a dedicated space and equipment. Which means money. Which races hold wealth and which race of people dominate those sports? White people, mostly. Williams sisters kicking arse buck the trend but are not an exception because...money.
But money isn't the entire answer. There is the Jimmy the Greek argument. Which is a USA thing. And he got fired. And I'll probably get sh&t for bringing it up. But you asked.
Unpopular to talk about but obviously real. Goes like this. Slave owners bred the Africans slaves they imported to be strong. Treated them like cattle. Their descendants are the product of that selective breeding and so excel in areas of strength and speed. Thus, the NBA and NFL show upwards of 65% representation of black athletes even though the overall population is about 13%.
That ugly episode in history aside, I really don't believe there is any inherent difference that would lead to anyone failing or succeeding in a sport.
Though if there were a previous example in history where natural selection or selective breeding came into play (are Canadian arms just made for Curling?) I'd be open to hearing about it.
Oh, I forgot about climate. But the bobsledders from the Caribbean put that to rest. But still, ski jumpers probably come from the Northern hemisphere. Mostly.