Derived from eu, meaning good, and tonus, meaning tone or tension, eutony was developed by Gerda Alexander of Germany during her work in Denmark in the mid-twentieth century. It is based on the theory that there is a constant interaction between muscular tone and psychic activity. Acting on muscle tone can affect the whole being and regulate the breathing, circulation, etc. Clients learn how to adjust their tonus through the observation of sensations in various situations. Clients will explore the body’s perceptions—from the skin to the bones—in movement, in relaxation, during activity, and at rest. Professional training is an individual process lasting four years, the last year being devoted to practicum and exams.