The MOST Important Guard Passing Principle 

Hip pinning is one of the two most foundational methods of controlling an opponent in side control. Since we often are fighting our opponents legs before we pass the guard, focusing on pinning the hips first makes the goal so much easier as their leg moblity and movment is significantly restricted, and as we pass our ooponents hips already being on the floor makes the finish and control in side so much easier.
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