The posterior pelvic tilt. Proper body The Natural Sculpting System positioning is essential to maximal development of the abs while protecting your back from injury. One of the most important aspects to understand in order to best develop the abs, is to maintain a proper posterior pelvic tilt during ab training. The pelvic tilt is broken down into anterior (front) and posterior (rear) tilting. Although the movement is quite simple, it can get confusing because of how the pelvis sits, crossing from front to rear of the body. Anterior tilt refers to the front of the pelvis moving down, and the back of the pelvis moving up. In posterior tilt, the opposite occurs: the back of the pelvis moves down and the front moves up. This is the optimal position in which to train your abs when doing belly workouts (although it may not be appropriate for an individual with lower back disc disease).