This textbook will provide the evidence base to design and prescribe the best exercise programs for the back. McGill's approach is based upon years of scientific research into back function of injured people to elite athletes. A description of a five stage program is provided. Examples are provided for each stage within a bad back rehabilitation program together with performance enhancement programs for athletes. Beginning with recognizing and re-patterning perturbed motor programs and progressing to the enhancement of stability and then endurance, the final stages continue with strength, power and agility training. Included in the textbook are general approaches to assess the demands of individual activities and sports and how to identify the critical components that need specific focus in an individual's back.