Some of my funnest moments in Karate involved getting pummeled or getting pushed to the point of exhaustion. It' hard to explain, but when some nutty 220lb 20 year old college kid starts throwing high kick at your head with no control it has the effect of about 6 energy drinks. Up till that point in my life that is the most focused and alive I had ever felt.
Here is an episode of Discovery channels Fight Quest. Are resident goof balls Doug and Jimmy go to Israel to train Krav Maga with members of the Israeli military and get more then they bargained for.
Part II and III are up at T.V. Time Limit