Check the sugar content. 20 oz. of Glaceau's Vitamin Water has about the same sugar and calories as a can of soda. 120 calories in a 20 oz. Glaceau, 150 calories in 12 oz. of Pepsi. 120 calories is roughly the energy put out by a 150-lb. man running a mile in 8 minutes.
I know there's more than one of those "rehydration" drinks out there that have the nutritional value of Kool-Aid or less. I just don't remember which is which right now. But many of them aren't any better than those juice boxes you used to take in your school lunch.
Personally, I use 1/4 strength Gatorade (mix) and a little salt in a 1-gallon jug. Cheaper, fewer calories, and it keeps me perked for a 90-minute or 2-hour workout. I drink about half of it per workout but I like to have the extra in case I need it.
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