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Neck pain during Side Control escapes often stems from a lack of hip pressure and attempting to push the opponent's hips away with your head and neck. Instead, focus on creating a strong base by driving your hips into the mat and using your shoulder to create space, then shrimping your hips out from under their weight.
When your opponent postures up, the key is to use your legs to control their posture and create an angle. Immediately after they post up, drive your shin across their face, securing your ankle with your opposite hand, and then use your hips to drive forward and slightly to the side to complete the triangle.
To maintain Mount against a bridge, focus on keeping your chest glued to your opponent's chest and driving your knees down and slightly forward, digging your shins into their hips. This creates a lower center of gravity and uses your body weight to pin them, making their bridging motion less effective.