To get to the top, you need to, of course, have some natural ability, a certain physicality that allows you to use your body well, but I think there is a certain element of luck there too. All the exertion these athletes go through and the stress they put their bodies through push their bodies to the limits and one thing that stops people from ever reaching the top is probably injuries. One serious injury, a muscle tear or broken bone, can end an athlete's career, and this probably stops the vast majority from ever getting there.
To get to the top, you need to, of course, have some natural ability, a certain physicality that allows you to use your body well, but I think there is a certain element of luck there too. All the exertion these athletes go through and the stress they put their bodies through push their bodies to the limits and one thing that stops people from ever reaching the top is probably injuries. One serious injury, a muscle tear or broken bone, can end an athlete's career, and this probably stops the vast majority from ever getting there.