Electrolytes, such as sodium, potassium, and magnesium, play a vital role in physical activity by maintaining the body's fluid balance and supporting muscle function. During exercise, individuals lose electrolytes through sweat, which if not replenished, can lead to cramping, fatigue, and impaired performance. Electrolytes help transmit nerve impulses and stabilize bodily functions, making them essential for optimal performance and recovery. Proper hydration and electrolyte balance are key components in enhancing athletic ability and overall endurance.