Best Exercise To Strengthen & Develop Lower Abs ------------- I'm a fan of the reverse crunch exercise to strengthen lower abs, and there's many variations of it, but here's my favorite one. Create an incline on the bench and grab on the back of it, or grab another object to hold on to and create stability. From there pull your pelvis towards your ribs and then drive the knees up to the ceiling (people tend to roll back here which doesn't work the abs as much). As you bring the legs down get a s