One of the black belts who drops in during our Hotbox training sessions, really funny guy, gives some really great tips and advice on how to improve my game, showed me something interesting. He's about 150ish and on the short stocky side. Okay he's actually really short. It makes it so all he has to do to get his leg out of my lockdown is leg curl just an inch and slip out to the side and he's out of my lockdown at will. So my question is Is the lockdown still effective on people with much shorter legs than you? I am still barely scratching the surface of the system, so until someone qualified says something, I'm going to attribute my inability to lock down this guy's leg to an error in my technique.