Want better ab workouts?Improving your core strength will help you develop muscle in your trunk, which includes your sides and lower back. Your core is primarily made up of your abs, the obliques and the erector spinae muscles or lower back. Developing the strongest core possible involves using all of your muscles, not just the ones you think of when you look in the mirror. Next time you are looking for exercises to target your core why not give one of these a try and see how they work for you. ~ Berceste