If you were to google (but not at work) best ab exercises chances are you would come across some type of leg raise…bringing your legs up while flexing at the hip. The problem with that is there is no abdominal muscle that flexes your hip. Most people mistakenly believe that this exercise would work the “lower Abs”. Again though, there isn’t really a lower ab muscle. The muscle most people think they are working with that move is the “six-pack” muscle or in geek-speak, the Rectus Abdominus.