Lower abs are the toughest area to challenge when it comes to ab workouts. The reason for this is because it’s difficult to create resistance when most of our ab workouts are done on the ground. Therefore if you’re going to challenge the lower abs, it’s best to get off the floor and hand from a pull up bar or sling to perform some hanging leg raises. You can do straight hanging leg raises, or side hanging leg raises to hit the lower abs and obliques. Once you have mastered these, move on to weighted leg raises, windmills, and static leg raise holds.