Klean Electrolytes supplies sodium, potassium, chloride, calcium and magnesium to help replenish electrolytes and retain hydration. Electrolytes are important for many reasons and help to maintain a normal balance of fluids within the body. They assist is maintaining a balance, of pressure between the inside and outside of cells and help to support the systems that regulate blood pressure. Hydration and electrolyte balance are also critical to nerve and muscle function. For example, muscle contraction is dependent upon the presence of calcium, sodium, and potassium. Electrolytes lost during exercise, particularly workouts that are long lasting or strenuous, can lead to fatigue, . Athletes exercising in extreme heat or humidity, or for three hours or longer dehydration, and muscle cramps continuously, risk dehydration. Sweat rates can range from 0.3 to 2.4L per hour (roughly a half pound to 5 pounds per hour). To determine your sweat rate, weigh yourself before and after running; each pound lost equates to ~2 cups of fluid. Although individual concentrations will vary widely, one pound of sweat contains approximately 80-100mg of potassium and 400-700mg of sodium.