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

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Weighing before and after the workout is the most accurate way to determine fluid loss. The weight difference reflects the amount of fluid lost during the exercise, which can then be replaced to maintain proper hydration levels. Relying on thirst can be misleading, as thirst signals may not always accurately reflect the body's fluid needs. Drinking random amounts of fluid during the workout can also lead to overhydration or underhydration, which can negatively affect performance and health. Estimating sweat loss may also not be accurate, as it does not take into account other factors such as breathing, and variations in individual sweat rates.

The Best Way to Determine How Much Fluid Must Be