I don't know if Katie ran the marathon or not, but I would like to point out one part of the argument where I have *some* personal experience.
My old roommate and I trained for just under 5 months for a triathlon. We did the triathlon, went home, showered, drank champagne, then went out for dinner with the other triathlon people in our training group. We partied our asses off as a celebration after dinner and danced all night. We wore dresses and high heels. My roommate's feet were in much worse shape than mine, I never had any chewed up toes, BUT, we did a triathlon, so there was also swimming and biking, not just running.
Just thought I'd play a little bit of the devil's avocado