In this Extreme Ab workout there are 6 different abdominal exercises each hitting different areas of the core. If need be add extra weight to some of the exercises to make more resistance so that you fail on the number of reps that I prescribed. This is to be performed on any day of your choice, twice per week. If you are unable to perform the prescribed amount of reps - do what you can and work up to what is required.
Your obliques will already have been worked considerably during the abdominal training so the exercises and amount of sets is low volume. This is to be performed on the same day as training your abdominals after your abdominal training is completed.