The muscle-test is a proven “feedback system” for the body. At the beginning of the 20th Century the muscle-test, which was already known from Mayan traditions, got developed further by orthopedic surgeons until it became part of the Academic Kinesiology (Kinematics). This doctrine deals with the exact sequence of muscle movements and the hereby caused movement of the joints. In kinesiology the muscle-test is used in order to get an accurate picture of the energetic state of the body.