a truly symmetrical spine does not exist!

"It is rare to find a truly symmetrical spine. In most cases the plane of the shoulders and chest is twisted relative to the plane of the pelvis, and as a result, all movements are performed most easily on one side of the body than on the other. In the early years, when a child tends to take random movements of great variety, this does not matter at all. In maturity, however, persons tend to repeat a limited number of movements--sometimes for hours on end--to the neglect of other movements. The body then tends to accustom itself to this restricted number of movements, the skeletal structure adjust to them, changes result, and posture becomes crooked."

Moshe Feldenkrais: Awareness through movement
Arkana Books, London - 1990
pag. 103

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