How Much Water Do You Need When Working Out?

Most of us have memorized this rule: Drink eight 8-ounce glasses of water a day. But did you know that the human body is made up of about 66 percent water? We are more than half water — so staying well hydrated is essential when being active outdoors. But how much water you need, and when you need it, really depends on the length and intensity of your workout.







