Much is made of hydrating before, during and after exercise. But depending on the duration and intensity of your activity, you might not need to carry a water bottle throughout your workout. For most of us, a good rule is to drink when you’re thirsty. If you are engaging in intense exercise (a multihour race, for example) or will be out all day — say, on a long hike — you should try to take fluids even before you feel thirsty. … Back to Article
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