Until now, the practice of cold-water swimming has been treated lightly by the scientific community, the curative effects all but dismissed by doctors seeking medicine-centred solutions. Combining cutting-edge neuroscience with case studies, laboratory results, and stories from the lives of patients, the author illuminates the ways in which cold water can affect us physiologically and mentally, and guides us in safely establishing our own, customised practice of cold-water swimming to harness the therapeutic power of water for improved circulation, a strengthened immune system, cell regeneration, and everyday vitality.