If you really want to get LBD-ready, you're going to have to commit to some exercise. And you'll be glad you did! In addition to revving up your metabolism and burning off lots of extra calories, exercise shifts you into a positive mind–set and boosts your energy level. Pledge to do 60 minutes of power–walking (or other cardiovascular activity) at least five times a week. At the end of one week, you'll have walked off hundreds if not thousands of calories, and before long you'll be stepping into that little black dress.