Human back is the large posterior area of the human body, rising from the top of the buttocks to the back of the neck and the shoulders. It is the surface opposite to the chest, its height being defined by the vertebral column and its breadth being supported by the ribcage and shoulders. The back provides support for the head and trunk of the body, strength in the trunk of the body, as well as a great deal of flexibility and movement. It does not permit twisting.
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