Firstly i will preface this thread by saying that this is by no means the case for every self defence class, or every self defence technique. I have noticed however that occasionally this does seem to be the case. What i mean is that people have parts of their art that they are loathe to part with, yet have no application in the sport of that art. So for example an arm lock would not be legal in a taekwondo tornament. As a result, they often end up popping up in self defence classes, alongside headlock defences and the like. That is not to say all arm locks are ineffective by any stretch of the imagination. I have my own views about which techniques i dislike personally, but thats not the point of this thread. Has anyone else been in a self defence class and been shown parts of the art that are clearly not going to be effective, and thus are discarded from the live part of the art, yet still crop up in self defence classes like a perenial weed?