How much is biology, how much is physics? How much is inherent ability, how much is technique? Does every individual runner have a maximum possible speed over a certain distance? Basically, what exactly does Usain Bolt do better than anyone else?
In: Biology
As to the main question, genes, body structure and physical training are very important. Some of those things can be improved upon and overcome. However, developing mental strength to take it to your limit is also important.
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