Hydration levels critically affect both cognitive and physical performance. Adequate hydration enhances blood flow, nutrient transport, and thermoregulation, which are essential for optimal physical activity. Even mild dehydration can impair focus, reaction times, and decision-making. Additionally, it can lead to decreased endurance and strength, negatively impacting exercise performance. Maintaining proper hydration supports cognitive clarity and physical resilience, making it crucial to drink fluids before, during, and after exercise, especially in hot or prolonged sessions.