The Progressive Relaxation and Breathing audio program, based in chapters 3 and 4 of The Relaxation and Stress Reduction Workbook, teaches progressive muscle relaxation, a stress management technique developed by American physician Edmund Jacobson in the early 1920s. Jacobson argued that since muscular tension accompanies anxiety, one can reduce anxiety by learning how to relax muscular tension. Jacobson trained his patients to voluntarily relax certain muscles in their body in order to reduce anxiety symptoms. He found that the relaxation procedure is an effective treatment for ulcers, insomnia, and hypertension. Jacobson's progressive relaxation is still popular with modern physical therapists and has many parallels with autogenic training. The CD includes a deep breathing routine. This CD is part of the Relaxation and Stress Reduction Audio Series.