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why do those muscle guys always carry around a gallon thing of water? are they just trying to keep super-hydrated, or is it to help their kidneys process all the supplements they're taking, or what?
I carry around a liter of water and usually have to refill it at least once. with a gallon, you'll have enough for your work out and you won't have to fill up. I'd rather be hydrated the dehydrated.