But wait—don’t I have to get more when I exercise? 
That depends. If you’ll be indoors and have managed to stay hydrated all day before the workout, then no. But if you’re in the summer heat, you can easily sweat out the equivalent of 4 cups of fluid in an hour-long outdoor session. In that case, drink 20 ounces of water an hour before, and try to take in about one half of a cup during every 15 minutes of activity, Larson advises. Going for a jog first thing in the morning? Have a drink beforehand. And if you’re training for a marathon or playing a sport for a few hours, weigh yourself before and after, says Leslie Bonci, RD, a sports nutritionist at the University of Pittsburgh Medical Center: “For every pound you’ve lost during your workout, drink 24 ounces of fluid to get hydrated again.”

(To be continued…)

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