Here’s a video by DrBenjaminLau, showing the use of two hydrotherapy techniques that can be used on people of all ages, though in the video, the patient is an adorable two-year-old. The techniques are useful for colds, coughs, congestion, sinus infections, migraine or other headaches, and indeed any condition where a better circulation of blood is desirable. Hydrotherapy, using alternating hot and cold water, is a very old therapy. There are entire spas devoted to hydrotherapy.