A stone massage is a massage that uses smooth, flat, and heated rocks placed at key points on the body. River rocks are typically used because they have become smooth over time from the river's current. To prepare for the treatment, the therapist heats the stones in water, using an electric heater, until they are within a precise temperature range. The localized heat warms and relax the muscles, allowing the massage therapist to apply deeper pressure. Hot stone massage is suited to people who tend to feel chilly. It's also suited for people who have muscle tension but prefer a lighter massage. The heat relaxes muscles, allowing the therapist work the muscles using lighter pressure.