3.Whenever You Sweat
Anything that makes you sweat — a sauna or a hot tub, time outside on a hot, muggy day — will cause your body to lose fluid. Ditto with exercise. As your muscles warm up, your body perspires to cast off heat. You’ll need to cool down with lots of water.
4.Before, During, and After Exercise
You need lots of water to replace what you sweat out. How much? Before you work out or spend time outside, fill up your bottle with 16 to 20 ounces of H2O. Drink 6 to 12 ounces about every 10-15 minutes while you’re active. Afterward, drink up again — another 16 to 24 ounces.
