In this module we define reflex, why we need to know about reflexes, types of reflexes (developmental, common, and ones we deliberately take advantage of in Trager), what effects we create by using reflexes, detailed information on muscle spindle including innervation, Golgi tendon reflex, the importance of the interneuron, how we use reflexes in Trager and how reflexes are influenced by Trager, and a few concepts related to biotensegrity.