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The best beverages to help you stay hydrated

Summertime is here, so you've got no more excuses for not going outside to get some physical activity. Outdoor activity is a great way to put the fun into fitness -- but it requires paying special attention to hydration.

When it's warm, your body perspires more to help you cool down. And depending on the temperature, humidity, and the nature of your activity, you might not even realize how much you are perspiring.

Don't rely on thirst alone to tell you how much you need to drink. To keep those muscles working and avoid fatigue; it's extremely important to drink plenty of liquids before, during, and after the activity.

Drink Up -- Before, During and After

A good guideline to use when preparing for an outdoor workout, whether it's walking, running, biking, or tennis, is to drink about two cups of fluid two hours before the activity. That helps make sure you are well-hydrated before you ever go outdoors.

Then, during the activity, try to drink 4-6 ounces every 15-20 minutes to keep your muscles well-hydrated. If you are planning an hour-long walk or gym workout, fill a water bottle with about 16 ounces (2 cups) and take it with you.

Last, drink up after you're finished with your exercise. If you really want to be precise, weigh yourself before you start exercising and again when you are finished. For each pound of water weight you lose, drink 20 ounces of fluid.

Which Liquids Are Best?

For most outdoor activities, good old-fashioned tap water does the trick. If your activity lasts an hour or more, either fruit juice diluted with water or a sports drink will provide carbohydrates for energy plus minerals to replace lost electrolytes (sodium, potassium, magnesium) in your sweat.

Sports drinks like Gatorade, Powerade, and All Sport can give you a needed energy boost during your activity. They are designed to rapidly replace fluids and to increase the sugar (glucose) circulating in your blood.

Read the label to determine which sports drink that is best for you. Ideally, it will provide around 14 grams of carbohydrates, 28 mg of potassium, and 100 mg of sodium per 8-ounce serving. The drink's carbohydrates should come from glucose, sucrose, and/or fructose -- all of which are easily and quickly absorbed. It shouldn't be carbonated, as the bubbles can lead to an upset stomach.

Most sports beverages are well-diluted and contain relatively few calories. If the flavor of a sports drink helps you drink up and maintain hydration, by all means enjoy. If you're worried about the added calories, try diluting your sports drink with water or pouring it into a thermos packed with ice.

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