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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.
by FailrunnerOne May 09, 2011
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