Dr. Stuart M. McGill is a professor of spine biomechanics at the University of Waterloo (Waterloo, ON, Canada). His advice is often sought by governments, corporations, legal experts and elite athletes and teams from around the world. Difficult back cases are regularly referred to him for consultation. Any product associated with this website has been tested in Dr. McGill's laboratory at the University of Waterloo, ON, Canada.   Learn more at: http://www.backfitpro.com/   Joseph Cambell intro: https://www.youtube.com/watch?v=aGx4IlppSgU