Hydration is crucial during physical activity as it regulates body temperature, supports metabolic functions, and prevents dehydration. Whether performing aerobic or anaerobic exercises, maintaining optimal fluid levels enhances performance and endurance. Dehydration can lead to fatigue, decreased strength, and impaired cognitive function, increasing the risk of injury. It is important for athletes to drink water before, during, and after their activities, particularly in hot conditions. Overall, proper hydration is integral for effective training, recovery, and overall health.