The role of hydration during physical activity is crucial for maintaining thermoregulation, cardiovascular function, and overall performance. Adequate hydration helps prevent dehydration, which can lead to fatigue, decreased endurance, and impaired cognitive function. During exercise, fluid loss occurs primarily through sweating, and replacing lost fluids is essential for sustaining energy levels and optimizing physical output. Hydrating before, during, and after exercise aids in recovery and helps transport nutrients throughout the body. Thus, understanding and meeting hydration needs is key to enhancing exercise performance and supporting long-term health.