There is an older Judo black belt (4th dan?) where i train BJJ, i've never rolled with him but he looks pretty strong. anyways, we were outside the gym about to bring in more mats for a roger gracie seminar a few weeks ago when the van turned up with a combination padlock on the back. my instructor didn't know the combo and we were all standing out in the cold scratching our heads when the judo guy grabs the lock and just bends it / snaps it off. it wasn't like it was a massive lock or anything but it'd take some serious grip strength to do what he did. so my question is do Judo guys generally have crazy grip strength from all the collar and sleeve grabbing?