38 Benefits of Full Body Massage SPA You Still Don’t Know 7) Improves immune system function. Full body massage does a large of things for body immune system. It will allow the nervous system to enter the parasympathetic response which lead to relaxation. Full body massage also allows the body to send more energy and resources through restoration and healing. Studies reported that full body massage can increases the production of immune cells such as natural killer cells and other immune cells that work to avoid HIV and fight cancer patients. In addition, the full body massage improves lymphatic flow that will allow immune system to work better.