The belief that swimming in cold water can improve one's health is hardly new. For centuries, people from all over the world have reported that immersing themselves in cold water alleviates their pain and improves their overall well-being. Even Katharine Hepburn famously claimed to treat her winter colds by swimming in the icy waters of the Pacific Ocean. But until now, the practice has been treated lightly by the scientific community, the curative effects all but dismissed by doctors seeking medicine-centred solutions for their patients' illnesses. In Chill, expert anaesthetist and researcher Dr. Mark Harper delivers long-awaited evidence that cold-water swimming can, in fact, achieve powerful, tangible health benefits. Combining cutting-edge neuroscience with case studies, laboratory results, and stories from the lives of patients, Dr. Harper illuminates the ways in which cold water can impacts us physiologically and mentally, alleviating conditions like: chronic pain dementia arthritis anxiety depression PTSD migraines and more. Dr. Harper guides us in safely establishing our own, customised practice of cold-water swimming in order to harness the therapeutic power of water for improved circulation, a strengthened immune system, cell regeneration, and everyday vitality. Eye-opening and actionable, and full of extraordinary discoveries about our minds, our bodies, and the healing powers of Earth's most plentiful resource, Chill is a drug-free, no-cost, revolutionary approach to lasting wellness and rejuvenation.