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The Spine and Pelvic Girdle
The shape of your spine has important consequences for the position of your shoulder and therefore your hands. The natural spinal curve allows the scapula to float around the posterior rib cage, contributing to the arm's significant range of movement. As soon as the upper body bends forward however the scapula can no longer float as freely and the shoulder needs to compensate.
The science of it
The human body is an amazing place. The study of it's anatomy and physiology is exhaustive and ongoing and we only need to cover a morsel of it here.
