Get your abs and core game on with the Ab Master Workout! For some serious burn perform each exercise as slowly as possible and make sure you bring your knees all the way to your waist every time. Your legs have to be parallel to the floor during leg raises. To kick it up a notch change the direction of raised leg circles with every rep e.g., circle to the right, circle to the left, circle to the right, circle to the left and so on until you've done 10 reps in total.
Extra Credit: For the ultimate EC keep hanging throughout each exercise (including breaks).