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When, where, and why do these spine angle changes occur in the Throacic Area? Why are there more changes in the Rotated than the Flat Shoulder Turn?
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Because the plane of the shoulder turn component is different?
The shoulder turn center is the Top of the Spine "Between the Shoulders"...therefore how one sets up the posture of the neck and the upper back is going to have a major factor in the motion of plane of the shoulders....
More flexion of the neck and upper spine...more deviation...in order to maintain visual centers of balance and rotation
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