I have allways heard that strength is not a factor, but I have been watching some of these videos on like wrestlers and BJJ'ers and I have got to say unless the guy was a TRUE master I dunno if he could take me. If the guy was ANY less weight then me and not near my strength some of those holds I could just pick myself and him during it and body slam him on his head. I dont see how some of these can be effective if the other person has you really outmatched strength and maybe weight wise. Or are they?