The benefits of Electrolytes NZ | Electrolytes Supplements Hydration Powder Drink NZ come from the benefits of consuming electrolytes themselves. Magnesium, potassium, sodium, and calcium all offer different essential benefits to the body and are easily lost during exercise due to sweat and exertion. During physical activity, whether prolonged or not, you must get additional fluids to replace the water lost in sweat. Sweat contains electrolytes, particularly sodium with a small amount of magnesium, potassium, and calcium. You lose, on average, one gram of sodium with every liter of sweat.