The Pettibon Weighting System consists of specially designed head, shoulder and hip weights that patients wear. The amount of weights and their placement depend upon the spinal displacement that needs to be corrected.
How the weights work: Wearing the weights alters the head's, thoracic cage's and pelvis's centers of mass, causing the righting reflexes to send spine correcting sensory input to the nervous system. To balance the body to the weights, the nervous system's innate organizing energy causes some involved spinal muscles to relax and others to contract, thereby repositioning and correcting the spine and posture relative to gravity. Additionally, the weights make the involved muscles do isometric exercises, needed to restore their strength, endurance and balance.
Pettibon: Weighting System