Whether in lake, lido, river or sea, we know the benefits of swimming outdoors and in nature - environmentally friendly and accessible, it can influence our happiness, our energy and our inner tranquility, and give us that winter glow.

Danish scientist Dr Susanna Søberg leads us step by step into the icy water and explains the "cold-shock response", the massive endorphin rush as our body reacts and adapts to very cold temperatures through the winter season. Not only do our circulation, heart, lungs and skin respond positively, but our immune system, metabolism and mental health too. In particular she explains how our "brown fat" is activated to benefit multiple health conditions.

Winter swimming is fast becoming one of our most popular pastimes. 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, providing such a boost to body and soul.

Translated from the Danish by Elizabeth DeNoma