To me, the answer is simple and is based in science. Whites, on average, have a lower percentage of fast-twitch muscle fiber compared to blacks, for example.
Basically, fast-twitch muscle fiber is good for short, explosive movements required in sports such as boxing and basketball. Slow-twitch muscle fiber is better for sports that require endurance, such as swimming or weightlifting. Blacks have a high percentage of fast-twitch muscles, which makes any given black much more likely to succeed in boxing. It has very little to do with "culture".
I can't share a URL, but here is a quote from study done in 2015:
"So since blacks have higher rates of type II fibers while whites have higher rates of type I fibers (41 percent type I for white Americans, 33 percent type I for black Americans) while West Africans have 75 percent fast twitch and East Africans have 25 percent fast twitch. Further, East and West Africans differ in typing composition, 75 percent fast for WAs and 25 percent fast for EAs, which has to do with what type of environment they evolved in."
Ceaser, T., & Hunter, G. (2015). Black and White Race Differences in Aerobic Capacity, Muscle Fiber Type, and Their Influence on Metabolic Processes. Sports Medicine,45(5), 615-623. doi:10.1007/s40279-015-0318-7
Basically, fast-twitch muscle fiber is good for short, explosive movements required in sports such as boxing and basketball. Slow-twitch muscle fiber is better for sports that require endurance, such as swimming or weightlifting. Blacks have a high percentage of fast-twitch muscles, which makes any given black much more likely to succeed in boxing. It has very little to do with "culture".
I can't share a URL, but here is a quote from study done in 2015:
"So since blacks have higher rates of type II fibers while whites have higher rates of type I fibers (41 percent type I for white Americans, 33 percent type I for black Americans) while West Africans have 75 percent fast twitch and East Africans have 25 percent fast twitch. Further, East and West Africans differ in typing composition, 75 percent fast for WAs and 25 percent fast for EAs, which has to do with what type of environment they evolved in."
Ceaser, T., & Hunter, G. (2015). Black and White Race Differences in Aerobic Capacity, Muscle Fiber Type, and Their Influence on Metabolic Processes. Sports Medicine,45(5), 615-623. doi:10.1007/s40279-015-0318-7
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