A lot of people mistake the core as the abdominal muscles only. Truth is, there is a lot more than just a six-pack that defines a strong core. The pelvic floor muscles and deeper transversus abdominis muscles can weaken and if left in their weakness, often contributes to poor posture, lower back pain and worse, incontinence & even uterus prolapse, especially for women post-pregnancy. Don't wait till it happens! Work on it while you can.