Winter swimming is fast becoming a popular activity. This beautifully illustrated exploration of cold-water traditions in Scandinavia and around the world shows how it can have a significant positive impact on our physical and mental health, confidence and well-being. Danish scientist Dr Susanna Soberg leads us step by step into the icy water and explains the ‘cold-shock response’. Not only do our circulation, heart, lungs and skin respond positively, but our immune system, metabolism and mental health as well.