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Body mechanics refer to the coordinated use of body parts to produce movements and maintain balance. Proper posture is its main key and this applies to the correct positioning of the spine, arms, pelvis, and legs.Standing is one of the most common postures ever used. It seems so easy to do but there is more to it than just plainly standing. Accurate positioning of body structures must be carried out in order to avoid unnecessary load to the spine, joints, and muscles.