Height is one physical attribute that helps, and professional players are mostly above average height for a reason. But also hand-eye coordination and fast-twitch muscles help even more. Many basketball players are very explosive athletes, because it's a sport with a relatively small play area and lots of quick movements are needed.

Track and swimming are where innate physical attributes have the most obvious benefits. Michael Phelphs had the perfect body for swimming. There is no amount of trainingg that 99.999% of the population could do to get close to what Usain Bolt ran. Most humans could not train to run under 4 minutes in a mile or under 2:30 in a marathon. They just don't have the right muscular and cardiovascular physiology.

Team sports are of course more complicated as other qualities come into play that aren't as directly physiological.