Twelve finalists, nearly 3,000 lbs, one goal -- to go from an eating machine to a dancing machine in Oxygen's new dance/weight loss competition series Dance Your Ass Off, hosted by Tony Award-winning actress Marissa Jaret Winokur. Bringing dance and diet together, Dance Your Ass Off features talented, full-figured contestants who will have to lose to win. Each contestant is paired with a professional dance partner who will train him or her for weekly stage performances -…