Why is hydration critical during physical activity?

Hydration is critical during physical activity primarily because it helps maintain performance and prevents dehydration. When engaging in exercise, the body loses fluids through sweating and respiration, and if these fluids are not replenished, dehydration can occur. Dehydration negatively impacts physical performance, leading to fatigue, reduced endurance, and impaired coordination. Maintaining proper hydration levels ensures that the body's physiological functions operate optimally, allowing athletes to perform at their best. Additionally, adequate hydration supports the regulation of body temperature and helps prevent heat-related illnesses during intense physical activity. Therefore, the importance of hydration directly ties to sustaining both physical and cognitive performance throughout exercise.