Electrolytes play a critical role during physical activity by helping to regulate hydration, muscle function, and nerve signaling. Key electrolytes include sodium, potassium, magnesium, and calcium. Loss of electrolytes through sweat can lead to dehydration, muscle cramps, and impaired performance. Therefore, it is important to replenish electrolyte levels, particularly during prolonged or intense exercise. Consuming sports drinks or foods rich in electrolytes can help maintain optimal hydration and support muscle function during physical activity.