Massage involves working and acting on the body with pressure. Techniques are commonly applied using hands, fingers, elbows, knees, forearm, feet, or a device. The purpose of massage is generally promoted as treatment for stress or pain. In professional settings massage clients are 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. Aquatic massage and bodywork is performed with recipients submersed or floating in a warm-water therapy pool.