Bootcamp workouts are efficient because you work your entire body — heart and muscles —by going from one exercise to another with minimal rest between. The workouts involve calisthenics like pushups, jumping jacks, crunches and other body weight exercises...the difference lies in the intensity. Expect to do push-ups, sit-ups, sprints, squats, climb stairs, race up hills and run through parks and neighborhoods. In bootcamp, your challenge is to take your body to its limit. You work, you sweat and, best of all, you burn calories like crazy.