Drink tons of water. If you're really pushing the workouts, even if you're not going ballistic in the cardio department, you're going to need to drink a lot all throughout the day. Even a sedentary person needs to drink nearly a gallon of water a day. If you're pushing your workout, you should make it at least two.
Pleasant side effect of proper hydration: when you sweat, you don't stink quite as bad, and you don't wake up with morning breath=)
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