No one really knows where the "eight glasses of water a day" myth began. When researchers from the University of Pennsylvania attempted to track down the studies behind this recommendation, they reasoned that it's essentially an old wives' tale. But it's not a bad goal to keep in mind. It's easily forgotten how beneficial water is to our system.

A glass of room temperature water first thing in the morning is great for digestion, your skin and helping the kidneys rid the body of any toxins. It also jump starts your metabolism and helps you wake up. We're not saying to give up your morning coffees, afternoon Diet Coke run or the evening libations, just try and get in some quality H20.

To figure out how many ounces of water you'll require each day to stay hydrated, divide your body weight in half and drink that number of ounces. Add eight ounces for each half hour of exercise.