Wouldn't recommend arm wrestling on a regular basis. I've seen about 4 different people break their arms while arm wrestling...and they were all bodybuilders. Ego is a nasty thing, inside of training and out. What these fools failed to realize is that tendon strength is very important (most bb's only train their muscles not their tendons). You can build up the thickest heaviest door in the world, but it's only as stable as the hinges it rests on.