There's no RSVP required for this fat-burning cardio party peopled with master instructors Alison Davis, Emily Welsh, Rebekah Sturkie, Annie Lee and Allie Del Rio. Just bring yourself, a thirst for fun and a willingness to sweat. Designed for exercisers of any skill level, the routine allows you to burn calories and increase your endurance, offering plenty of modification options if the going gets too tough.