About Fibromyalgia, Part 3 2. How to Practice Cold and Hot Water TherapyWhen you first get into 14-18°C (57-64°F) water, it's "Ahhh, it's so cold~!!! I can't do it~ I'm getting out~~~!!!"Almost all patients react this way the first time they enter the cold water. However~~ once you understand the reason why you must immerse your body in this cold water, you'll find your sane mind accepting that..