With exercise, the body temperature rises. This heat must be dissipated, or the horse will literally “cook”! The body cools itself through the evaporation of sweat, so sweating is especially important for the exercising horse. The sweat contains water and electrolytes, or salts. The main electrolytes are sodium, chloride, potassium, calcium, and magnesium. When the body loses water and electrolytes, various functions are compromised, and the health of the horse can be at risk. To ensure that your horse remains healthy, learn to effectively replace both the water and electrolytes — and the electrolytes must be replaced in balance with what has been lost.