Massage, is a method of manipulating the skin to produce healthful effects on the skin and underlying tissues. "Western massage" consists of stroking, rubbing, kneading, and striking the skin, usually with the hands or fingers. "Eastern massage" includes these same methods, but it also focuses on applying pressure at specific points of the body according to acupuncture techniques. Massage can improve blood circulation, relax muscles, stimulate nerve endings in the skin, and promote a feeling of general well-being. Depending on how the massage is given, its effects can be either relaxing or invigorating. Massage is often used to promote healing of an injury or muscle soreness, or to relieve tension. People who give massages should be well trained, and they should be knowledgeable about physiology.