Hot stone massage is a type of massage therapy that uses heated stones to help relieve muscle tension and pain. The stones are usually made of basalt, a volcanic rock that retains heat and is heated to between 130 and 145 degrees. During the massage, the therapist places the stones on specific points along the body, known as acupressure points, or uses them as an extension of their hands to gently massage the muscles. The combination of heat and pressure can help to ease muscle stiffness, improve circulation, and calm the mind.