The best way to determine how much fluid must be replaced as a result of a workout is to

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Weighing before and after the workout is the most accurate way to determine how much fluid should be replaced because it takes into account the amount of sweat lost during the workout, which is a good indicator of fluid loss. Relying on thirst or guessing based on how much sweat was produced may not accurately account for individual fluid needs. Drinking various amounts of fluid during the workout may also not accurately reflect fluid needs because sweat loss may vary throughout the workout.

The Best Way to Determine How Much Fluid Must Be