Interesting questions and comments. This is one of the postures that I understand the least and perform the worst. As a result, I have no real enlightenment to provide. I would, however, like to expand the subject slightly and add one more question.
I have always thought of Snake Creeps Down ("SCD") in terms of a flattened "V" shape, which can be thought of as the outline of the "shadow" formed on the ground by the 135-degree angle between the left leg and foot and the right leg and foot. (Perhaps, a backward check mark (“ü”) would be more precise, given that the right knee is bent. That, however, overtaxes both my conceptual and typing abilities.) Lately, it has occurred to me that the “V” image is flawed, because the straight lines formed by the legs cannot include the hip joints and the pelvis. Schematically, the pelvis forms a straight line than cannot fold in the middle and cannot simultaneously align with both sides of the “V” shape.
My question is: "How should I align the line of my pelvis with the sides of the "V"?
Should the hip joints be equally open? This would leave a “V” with a bottom that is a sawed-off blunt point, formed be the flat (or slightly curved) line of the pelvis. (Perhaps, a flattened upside-down volcano is the most analogous shape, like this “\_/”, but flatter, since it should have a 135-degree angle between the sides.)
Should I try to have my right hip socket more open than the left one so that I would be aligning the line of my pelvis more with my right thigh? This makes it easier to straighten the left knee and lengthen the left leg, but makes it harder to keep the right knee in line with the right foot. A possible argument in favor of this is that I recall Yang Jun talking at a seminar about the importance of keeping at shoulder width the parallel lines running east to west through the heels. He said that the proper shoulder width allows space for the body to sink down.
Should I try to have my left hip socket be more open so as to align the line of my pelvis more with my left thigh? This eases the problem of the right knee’s left-right alignment, but I think it implies that the knee must go quite far to the right and that the length of the original stride is critical to the depth of the posture.
One last possibility is that the orientation of the pelvis must change during the “dipping” portion of the posture. I recall one teacher speculating that something like this might be appropriate for the anatomy of women, who generally have wider pelvises than men. If I recall correctly, I think the proposal was that women would sink and rise back up by sequentially opening up first the left hip socket and then the right one.
Any ideas or suggestions?
Thanks in advance,