To me, gymnastics is the pinnacle of sports, when it comes to testing the limits of the human body. I don’t think there’s another sport that requires such complete athleticism: power, speed, strength, flexibility, balance, precision, etc. From the rings, to the vault, to the floor exercises, the very best do things consistently that defy gravity. And perhaps with the exception of the rings, female gymnasts seem to be able to do everything the male gymnasts do.
In short, I think great gymnasts would be able to work there way into most every major sport and excel. The reverse course would be much dicier.