yeah, my ju-jitsu focused almost solely on standing and ground locks. The only time I got a chance to test their effectiveness was when I was theoretically sparring (I say theoretically because he had something against me and it started to get unfriendly) an aquaintance. I kept trying to apply the joint-locks I had learned in Ju-jitsu, but I couldn't really get a hold of him, and when I did, he just muscled out. So, I have to agree with Master Jules and just about everyone else here, stun them first, or wok on some serious hand strength.