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Drinking water is especially important if you're exercising, because you're sweating off extra fluids. Test our knowledge of fluid replacement and exercise.
Answer True or False
 During
physical activity, people lose about 4 cups of fluid an hour.
People
only need to drink fluids before exercising.
Drinking
when you're thirsty will prevent dehydration.
How Did You Do?
1.
True. Dehydration results if that fluid is not replaced.
2.
False. It's important to drink fluids before, during, and
after exercise:
 Before:
Drink at least 2 cups of fluid two hours before exercise. About five to
15 minutes before you begin, drink another 2 cups.
During:
Drink 1/2 to 1 cup every 15 to 20 minutes.
After:
Drink 2 cups for every pound you lose through physical activity - that's
water you're losing immediately, not fat - and continue to drink throughout
the day.
3.
False. By the time you're thirsty, you're already on you
way to becoming dehydrated. Other early warning signs of dehydration include
headache, appetite loss, dry mouth and eyes, fatigue, and lightheadedness.
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