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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.{relatedarticles}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.