EBMAS guys use your sensitivity aspect to get straight in and take the center, while keeping the leg "springy" in case manuvering needs to be done. Weight's on the back leg almost entirely, so that when someone is attempting to sweep the front leg posture is maintained. I think EB even showed a bit of it on the seminar video that's floating around. While not chi gerk in the traditional sense, I'm thinking that might be more of what you were asking about.
From a traditional standpoint, the bong/jing/jut gurk setup which is great, but I prefer to use more of a free flowing san sao approach to it; as that's the way it was shown to me originally.
Overall I think it's a great tool. I've always liked being able to offset someone with my legs, and have always used my legs to block and manipulate low attacks. Additionally I'm almost always using gerk techniques down low at the same time I'm using sao fot...so the skill in my mind is imperitive.
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What's always worked well for me is when I enter from an "outside" angle, say like a right tan sao/tan do vs a right punch. Depending on the leg positioning (which leg I stepped forward with) I'd leg reap inwards or outwards while controlling the arm and elbow with some sort of chin-na. It's a good setup...and while it doesn't work 100% of the time, it works more often than not, because once someone is unbalanced, the mind is redirected from the punching arm allowing me to more easily manipulate it into and arm bar or a standing figure 4 lock (kimura type lock).
Good question.
"I don't know if anyone is known with the art of "sitting on your couch" here, but in my eyes it is also to be a martial art.
It is the art of avoiding dangerous situations. It helps you to avoid a dangerous situation by not actually being there. So lets say there is a dangerous situation going on somewhere other than your couch. You are safely seated on your couch so you have in a nutshell "difused" the situation."