Hydration Counts: We've Got the Proof

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Determining how much water you need during a workout might require some experimentation. Weigh yourself before working out, and if you weigh significantly less than before you worked out, then you may not be hydrating enough. If you weigh more than before working out, then you might be drinking too much. A good rule of thumb is to drink two to three cups of water a couple of hours before working out; drink a cup 15 minutes before exercising; then hydrate every 10-15 minutes during exercise. After working out, drink three to four cups of water for every pound lost. Always drink when you feel thirsty, exercising or not.