Massage is used in the working of superficial and deeper layers of muscle and connective tissue using various techniques, to enhance function, aid in the healing process and promote relaxation and well-being. Massage involves working and acting on the body with pressure - structured, unstructured, stationary, or moving - tension, motion, or vibration done manually or with mechanical aids. Target tissues may include muscles, tendons, ligaments, fascia, skin, joints or other connective tissue, as well as lymphatic vessels or organs of the gastrointestinal system.