Question: But there are some famous athletes who began running marathons at a very young age.

Sri Chinmoy: And many of them are suffering for it! Some of them look so fragile now, but they have such determination. Sometimes one member of the family can jump into the water and swim, but if others try, they may drown.

From:Sri Chinmoy,The outer running and the inner running, Agni Press, 1984
Sourced from https://srichinmoylibrary.com/ori