The main purpose of hydration during exercise is to maintain optimal body function and performance. During physical activity, the body loses fluids through sweat, and proper hydration helps replace these lost fluids. Staying hydrated is crucial for regulating body temperature, maintaining blood volume, and ensuring adequate circulation. Dehydration can lead to fatigue, decreased coordination, heat exhaustion, and impaired physical performance. Therefore, drinking water or electrolyte-replenishing beverages before, during, and after exercise is essential for sustaining energy levels and supporting recovery.