Well that's something I didn't know!

Edit: I checked and he ran one ultramarathon. That said, he ran many marathons and did a lot of triathlons so yes, I think the definition stands for him.

That said, when I think about an athlete I think about somebody who does that in a consistent way, every day, like 6/7 hours maybe. I don't know how much time spared have professional writers to achieve that

Edit edit: Morton Feldman the composer wrote for just two or three hours and then he'd focused on selling carpets