Here are three different muscle testing techniques. We also call muscle testing “applied kinesiology.” In their book, “Health Mastery Through MRT” by Drs. Mark and Patti Virkler write, “Applied kinesiology is a system which uses the body as a laboratory of investigation. The response of the body is unerring. The body never lies. Here is the definition of muscle testing: Muscle Response Testing (MRT) is a way of checking the energy flow within your body and discovering what organ(s) are under str