Learn Somatic Exercises at Northern Lights School of Massage. According to Thomas Hanna, many of the effects of aging—aching muscles and joints, stooped posture, stiffness and weakness—are unnecessary and reversible. These problems are not due to structural weaknesses in the body but to sensory-motor amnesia which can be corrected. We demonstrate several reflex responses which can become locked into the human body under conditions of stress. We will then demonstrate a process and exercises which will help you become aware of previously unconscious muscle contractions. By establishing conscious awareness, we can then relax muscle groups which have been “permanently” contracted for years.