Scarlet, I like what you said about the hip joints as targets! makes for an easy take down.
I’ve come to the conclusion that they way to isolate the waist from the hip is to:
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Keep your hips and shoulders joint in alignment.
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Keep your elbows and knees pointing in the same direction.
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Keep your hips, shoulders and head level.
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Keep the back relaxed with its natural curve maintained (ie don’t tuck under the tail bone)
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Keep the bai hui and huiyin in relaxed alignment. Let the shoulders relax down the back.
If you do all this in your Taiji form the body will naturally move from the waist. If you try to focus your movement on the waist you will lose the connection.
Also, EMA’s have some moves that adhere to these principles but in IMA’s all moves adhere to these principles.