Why not just focus on the six-pack muscles? Strengthening your entire core is not only crucial for sculpting a flat stomach, but these muscles also provide support for the entire body in everyday movements, reduce back pain, and improve posture. Your lower abs? Well, they are under there somewhere…maybe? When it comes to developing a visible six-pack, there’s no denying that it tends to be the bottom two (or four) that many women have a harder time with. And we're going to get into why.