You Want: Amazing Abs | Target: The serratus anterior. Why it works: Put your hands on the sides of your rib cage at your bra strap. You're feeling these small, hardworkin' muscles. When they're strong, they act like little arrows pointing to defined abs. "The serratus highlights or accents the ribs, making the whole torso appear more defined," says trainer James Bowman, owner of Northwest Strength Lab on Bainbridge Island, Washington.
One exercise to end lower belly pooch ... Every girl should read this! This stretch will bring your hips back to where they should be, ease forward pressure on your lower back, and dial back the lower belly bulge.