my favourite for mission control type stretches. is going in single lotus position and then grabbing your other shin and pulling it to your chest. it really pulls those butt muscles and hamstrings which help. you have your butterfly stretches. u ahve just doing the rubberguard as tight as possible. whole bunch of things. tbh any legs stretches will help you with rubber guard. its how much time u put in it that will make the difference.
best thing that happened for ym flexibility was doing what master eddie suggested and stretching everywhere. watching tv. hanging with friends. its amazing
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