Unreasonable

This is what happens when you go to The Edge (as told by the narrator of an old judo documentary that you can see here):

This is unreasonable [doing 600-1000 push-ups a day], we know that, but it pushes us beyond a physical limit [The Edge], to another place, way outside or way inside. I don’t know where exactly, but I’ve been there.

Unreasonable, obsessive, excessive. That what it takes to push past physical, emotional, and psychological boundaries.