wayne hansen wrote:Note she stands with locked knees most of the time
There lies the difference
Now I’m going to ask another question
Please don’t insist I answer it
What do you think the main reason we centre the coccyx from a tai chi point of view
wayne hansen wrote:I say centre because tuck implies over doing it
Wing Chun tuck
To get it right feel at what point the quads start to lift then go back
It specifies the point with respect to which dynamic reaction force at the contact of the foot with the ground does not produce any moment in the horizontal direction, i.e. the point where the total of horizontal inertia and gravity forces equals 0 (zero). The concept assumes the contact area is planar and has sufficiently high friction to keep the feet from sliding.
Centroidal moment pivot (CMP). The CMP is the point where the ground reaction force would have to act to keep the horizontal component of the whole-body angular momentum constant. When the moment about the center of mass(CM) is zero (B), the CMP coincides with the center of pressure (CP).
However, when the CM moment is non-zero (A), the extent of separation between the CMP and CP is equal to the magnitude of the horizontal component of moment about the CM, divided by the normal component of the ground reaction force.
wayne hansen wrote:What do you think the main reason we centre the coccyx from a tai chi point of view
windwalker wrote:Might help to understand why some lines of taiji talk of flattening the back in order to bring into alignment whats called a "zero moment point"
part of the way this is done , involves slightly tucking the sacrum
why its done...depends on theories used
GrahamB wrote:Well, just to play devil's advocate - there are also people I respect who have very valid martial reasons for tucking their butts. One example I saw recently was Henry Akins. I've tried what he's showing and it works exactly as advertised - your posture is stronger with your butt tucked. Who knows what's 'correct' anymore!
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