Work From the Inside Out
True beauty comes from within, and your abs are no exception. While the 6-pack-forming rectus abdominis muscles get all the attention, they are one of the least-used muscles, functionally-speaking, says Hoeber. That means, unless you do a gazillion crunches a day, they quickly lose definition. Talk about high maintenance.
For beauty that’s more than skin deep, focus on your “inner unit” instead. The inner unit, commonly called the core, is comprised the transversus abdominis (TVA), internal obliques, diaphragm and pelvic floor muscles. In addition to stabilizing your back, the inner unit muscles literally hold in your gut. Moves that focus on strengthening the core help create a lean, firm silhouette.