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. Massage can be applied with the hands, fingers, elbows, knees, forearm, feet, or a massage device. Massage can promote relaxation and well-being, can be a recreational activity, and can be sexual in nature (see Erotic massage). The word comes from the French massage “friction of kneading”, or from Arabic massa meaning “to touch, feel or handle” or from Latin massa meaning “mass, dough”, cf. Greek verb μάσσω (massō) “to handle, touch, to work with the hands, to knead dough”. In distinction the ancient Greek word for massage was anatripsis, and the Latin was frictio. In professional settings massage involves the client being treated while lying on a massage table, sitting in a massage chair, or lying on a mat on the floor, while in amateur settings a general purpose surface like a bed or floor is more common. The massage subject may be fully or partially clothed or unclothed.