Yonkyo is my favorite wrist lock
, it is painful and effective. I have taken to practicing Aikido off mat like Karate. Maki training is good, and now since I am an Aikidoist I am practicing Yonkyo on a broom stick, I have almost come to the point of breaking the broomstick, then I will move onto rebar. This will be effective in street combat. My question is, does anyone have any other Aikido toughening ideas.