Athletes primarily lose fluids through breathing, urination, and perspiration. As exercise intensifies, body temperature rises and sweating acts as a cooling mechanism to maintain optimal performance conditions. This sweating leads to the loss of both water and crucial electrolytes. Maintaining water levels is essential for preserving plasma volume, ensuring effective oxygen delivery to muscles. Electrolytes like sodium and potassium play vital roles in muscle function, nerve transmission, and fluid balance, among other bodily processes.