In this episode, Al interviews Dr. Mark Harper, attending anesthesiologist in the UK and Norway, researcher, and author (recorded 7-18-23). Dr. Harper describes how, although keeping patients warm during surgery was a significant part of his job, he drew a fascination towards cold-water swimming and its impact on one’s mental health. Dr. Harper describes the research that he has been a part of in the area of cold-water swimming and the future of the research.