Over the years there has been an apparent contradiction between the widely utilized treatment of low back pain through exercise, and the often apparently disappointing results reported in the scientific literature. Recently published studies have shown that the most important factor regarding the training effects of chronic low back patients is the administration of a high training stimulus (number of repetitions of the exercise, exercise resistance, and the total number of sessions). This would explain why several of the previously published studies regarding training show insignificant results. Simply stated, in many low-dosage or short-time studies, the positive effects of training have not had adequate opportunity to take hold in the chronic low back pain patient. The patient group which has been operated on for disc prolapse often exhibits considerable functional deteriorations post-operatively. Rehabilitation studies have shown that many of these patients also benefit from post-operative rehabilitation including high dosage exercise programs. Exercise programs are generally free of side-effects.