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    4. Do Consider 'Recovery Drinks' for Muscles

    However, "recovery drinks" like Endurox R-4 help endurance athletes recover from the workout, says Carmichael. "Recovery drinks have a heavier mix of carbohydrate replenishment, they replenish glycogen stores, and usually have antioxidants to help reduce muscle stress and protein to help muscle recovery." "Even the weekend warrior who plays a lot of tennis one day, who is sore the next day, could benefit from drinking one within the first 30 minutes after playing. It helps reduce muscle stress," Carmichael tells WebMD.

    5. Do and Do Again: Drink Water

    For less-intensive exercisers, water will do, says Zeisel. Don't even bother with bottled water -- good old tap water works just fine. "When it comes to exercise and water loss, tap water and bottled water are all the same."

    However, a new "fitness water" called "Propel" has a light flavoring and a few antioxidant vitamins -- not intended to help performance, just to add to a healthy diet, says Mary Horn, MS, a research scientist at the Gatorade Sports Institute.

    Flavorings in beverages "encourage the exerciser or athlete to drink more and stay hydrated better," she tells WebMD. "Our research shows that both the taste and sodium content of Gatorade naturally make people drink more of it, so they get the hydration they need."

    It's totally true -- that little bit of flavoring does make people hydrate themselves better, says Bonci. "Water doesn't have any flavor, it's flat. Water alone can cause people to stop drinking before their fluid needs are met."

    Carmichael's not convinced. "I don't think [fitness water] does a great job of anything. It's a marketing ploy," he tells WebMD.

    How Much Should You Drink?

    If you're exercising intensively in the morning, "A sports drink is better than being on empty," says Bonci. "Most people find they do better if they have something, but it can be solid or liquid form."

    While you're exercising: "Thirst is not a good indicator at all," says Bonci. "If you're thirsty, you're already dehydrated."

    Drink something every 15 to 20 minutes, if possible: Since that's not possible in all sports, you may have to drink more before you exercise, so you have enough in your body.

    Don't try something new before competition: "That's a recipe for disaster," Bonci tells WebMD. The body needs to get used to new fluids, so do it really, really gradually."

    Don't drink sports drinks during couch-potato hours. "Those extra calories!"

    Don't drink fruit juices before exercise: "They're a very, very concentrated form of carbohydrate," advises Bonci. "That means you might get an upset stomach or a laxative effect. You'll be running, but not necessarily on the field."

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