When you are in the bottom of side control, one of the most important things you need to do as fast as possible is to frame your opponent's hips and head control.
Once you do this, you can create a little space and start to walk away from them.
This will create an empty space between you and your opponent. Fill the space by bringing your bottom knee in contact with your bottom elbow, at which point you can connect against your opponent's hip and extend your upper body creating distance between you and them.
Finally, establish a solid open or close guard position.
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