Flex Effect Facial Resistance Training is a complete Facialbuilding program involving all the voluntary muscles of the face and neck. Through Facial Resistance Training, the muscles increase in size creating a firm, smooth lift. The majority of facial exercises taught today, such as isometrics, stop short of actually increasing the size of the facial muscle. Isometrics do a great job of replacing tone, (a slight contraction found in all muscles) but render very little result.