2011 Reprint of 1963 Edition. Full facsimile of the original edition, not reproduced with Optical Recognition Software. Edmund Jacobson American physician in internal medicine and psychiatry and a physiologist. He was the founder of the Progressive Muscle Relaxation and of Biofeedback. Jacobson was able to prove the connection between excessive muscular tension and different disorders of body and psyche. He found out that tension and exertion was always accompanied by a shortening of the muscular fibers, that the reduction of the muscular tonus decreased the activity of the central nervous system, that relaxation was the contrary of states of excitement and well suited for a general remedy and prophylaxis against psychosomatic disorders. This title is a guide written for businessmen to aid them in relaxing.