Inversion therapy has been used to relieve back pain as early as 400 BC when Hippocrates, the Father of Medicine, strung up a patient on a ladder with ropes and pulleys and allowed gravity to do its work. The concept of inversion was not widely recognized in the United States, however, until Dr. Robert Martin (a California osteopath, chiropractor and medical doctor) introduced the "Gravity Guidance System" in the 1960's. This revolutionary concept addressed the effects of gravity on the human body, the simple solution of inversion therapy, and the resulting benefits.