Tom Brady
Thing is, people bang on about how great it was he kept playing until his mid 40's. I'm no expert on the subject, but didn't he just have to stand there and throw a ball really hard and accurately? I can't imagine there was much mileage done in his legs during a game? Was it really that amazing?
My point is, aside from the fact he clearly practiced his game like a pro throughout his career, does he know that much more about fitness, nutrition and longevity?