You have to train with people who really know it. Watching the videos online and reading his book do nothing if you can't see them practiced in front of you. After I finished the book I started training with a guy who has been using it forever, and I'm at least 5 times better at it now. For some reason the hard part for me is controlling the other guys posture and getting mission control and hand to mat...from there its hard for the other guy to escape and you usually submit him or advance the position.
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