failrunning is similar to freerunning (aka - parkour), can be equally athletic or extraordinarily painful, but is only impressive if done purposefully and skillfully.
It happens skillfully when done on purpose in the same way stuntmen fall and look hurt in fight scenes, or it can happen by chance when someone either has an accident, or is just incapable of performing an action.
I saw a failrunner fall down 3 flights of stairs and get up without a scratch.
Some guy tried to show off his parkour, and ended up failrunning off a balcony and crushing his nuts on a bike rack.
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).