Thermotherapy is when you use warmth to make your body feel better. Have you ever had a sore muscle or felt really cold and wanted a warm blanket? That's kind of like thermotherapy! There are different ways to get the warmth that your body needs, like taking a warm bath or shower, using a hot water bottle, or even sitting in a sauna. The warmth can help improve blood flow, decrease pain, and relax your muscles! Just remember to be careful and not get too hot, because that can hurt your body too.