This interval training cardio and sculpting routine will burn 400 calories in just one 45 minute workout. Two time Gold Medalist Summer Sanders will lead you through three 15 minute workouts that combine cardio and sculpting to rev your calorie burn and metabolism. Each workout combines cardio intervals with resistance training, along with periods of active recovery. By varying the intensity throughout your workout and allowing for proper recovery time, you ll avoid hitting plateaus and will constantly be blasting fat!