"If God invented marathons to keep people from doing anything more stupid, the triathlon must have taken Him completely by surprise."
P. Z. Pearce
BONK: (verb) when an athlete completely runs out of energy, a.k.a. "hitting the wall" or "trashed". Not to be confused with a similar term used in British dialect, which can be translated into some American dialects as knocking boots, or doing the wild thing.
Because Rachel had slacked off on her training, she completely bonked in the race, pulling to the side to vomit before passing out.