how much water should you drink?

We're made of 80% water, so getting enough for your bodyweight seems pretty important right? Most of the population doesn't get HALF of what they should! The old method was 8 glasses of 8 oz per day. New studies have shown that the amount of H2O you should consume is in relation to your body weight and your activity level. So, how do you do that? EASY! Here ya go.. just a little math:

1. Your weight: The first step to knowing how much water to drink everyday is to know your weight. The amount of water a person should drink varies on their weight, which makes sense because the more someone weighs the more water they need to drink. A two hundred pound man and 100 pound woman require different amounts of water every day.
2. Multiply by 2/3: Next you want to multiple your weight by 2/3 (or 67%) to determine how much water to drink daily. For example, if you weighed 175 pounds you would multiple that by 2/3 and learn you should be drinking about 117 ounces of water every day.
3. Activity Level: Finally you will want to adjust that number based on how often you work out, since you are expelling water when you sweat. You should add 12 ounces of water to your daily total for every 30 minutes that you work out. So if you work out for 45 minutes daily, you would add 18 ounces of water to your daily intake.