Hot stone therapy takes regular massage and adds heat to the mix. The therapist warms smooth, flat stones, usually basalt because it holds heat well, and places them on key points of the body like the spine, palms, and toes. From there, the stones are also used as an extension of the therapist's hands, gliding over muscles with the warmth helping everything loosen up faster than it would otherwise.
The heat is the whole point here. It causes blood vessels to dilate, which improves circulation and helps muscles relax almost immediately, so the therapist can work deeper without needing as much pressure. That makes it a good option for people who want the benefits of a firmer massage without the intensity of something like deep tissue work.
It's also just deeply calming. Between the warmth and the slow, rhythmic strokes, a lot of people find hot stone sessions more meditative than other types of massage. It tends to help with muscle stiffness, poor circulation, and general stress, and it's often used for people dealing with tension in the back, shoulders, and neck.
That said, the heat means it's not right for everyone. Skip it if you have diabetes, high blood pressure, are pregnant, or have any condition affecting sensation or circulation, since you might not notice if the stones are too hot. Always check with a doctor first if you're unsure.
A typical session runs 60 to 90 minutes, and many spas combine it with aromatherapy oils to round out the experience.