If you're training for a marathon, go ahead and reach for a sports drink. As for the rest of us, it's overkill. We just don't need the extra calories, sugar and sodium. Gatorade Lemon-Lime, for example, packs 125 calories into a 20-ounce bottle. A 32-ounce PowerAde has 200 calories. That would completely negate our two-mile walk. And don't even get us started on "energy" drinks. It takes about two minutes to guzzle a 16-ounce can of original Rockstar, but we pay a high price: 280 calories and 62 grams of sugar, just for starters.