It’s important to recognize physical activity is very different from mental, creative or social activities. If you can convince people of things, you can be wildly successful. They may listen to you because you speak well, they may listen to you because you’re telling them what they want to hear or they may listen to you because you’re rich. None of which require the rigorous practice of a professional athlete.

Same goes for creative endeavors. I can be much more creative (and successful) if I’m well rested vs. grinding.

Contrary to you, the most successful people I know didn’t work hard at all. They either inherited cash and a network or they invented something that got huge and they sold it.