This episode dives deeper into the metabolic adaptations to cold stress, highlighting shivering and non-shivering thermogenesis (NST). We examine the role of brown adipose tissue (BAT) and how it generates heat via uncoupling protein-1 (UCP-1). Cold exposure increases reliance on glycolysis, favoring carbohydrates over fats, leading to higher lactate production and oxygen consumption. We also discuss how cold conditions alter endurance performance, hydration needs, and energy expenditure, emphasizing the importance of maintaining core temperature and fluid balance in extreme cold environments.