Rob Kall: Handwarming from the Inside out; Thermal / Temperature Biofeedback Have you warmed your hands lately? How about your feet? Thousands of people do it every day and they don't do it by putting their hands or feet under warm running water or by holding warm clothes, straight out of the dryer. They do it from the inside out. Why would they do it? To help symptoms of stress, anxiety, headache, high blood pressure, Raynauds, diabetes, arthritis and more.