Reaction Massage is a type of massage therapy that focuses on the body's reaction to the massage. It is based on the idea that the body can be trained to respond to massage in a positive way, and that this response can be used to help reduce pain and improve overall health. The term 'reaction massage' comes from the fact that the massage therapist will observe the body's reaction to the massage and adjust the massage accordingly. The three-letter acronym AAH stands for 'Active Assisted Healing, ' which is a form of reaction massage that uses active movements to help the body heal itself.