How often have we heard the question, “how do I train my lower abs”; and what about the debate whether lower abs even exist? Because of the neural innervation of the rectus abdoiminus or ‘six-pack’ and actions of other muscles I think functionally speaking lower abs certainly do exist. Rollouts are similar to the plank posture in yoga where you isometrically engage your abdominals and core to stabilize and control anterior pelvic tilt thus preventing hyper-extending your lower back.