Electrolytes function in the body by helping to maintain fluid balance, enabling proper nerve function, and supporting muscle contractions. Key electrolytes include sodium, potassium, calcium, and magnesium, which are essential for various physiological processes. They assist in transmitting electrical signals in cells, regulating hydration, and stabilizing acid-base balance. An imbalance of electrolytes can lead to issues such as muscle cramping, fatigue, or even serious health concerns. Thus, ensuring adequate electrolyte levels is crucial for overall health and optimal physical performance.