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As opposed to quadrupeds, whose vertebral columns hang like the chains on a suspension bridge, humans generally stand upright with the vertebral bones loaded one on top of another, divided by rubbery disks. The benefit we gain from our vertical posture and free use of the arms and hands is accompanied by the drawback of having our intervertebral disks under compressive force even when we are simply upright, sitting, hiking, or running, and under even more compressive force when we are lifting and carrying heavy things. When we are in a standing situation, any force we apply with the upper...

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