15-Minute Crunch-Free Ab Workout
Move 5: Squat Against the Wall
(A) Stand with a stability ball behind your lower back. Step forward with both feet, keeping them hip-distance apart. Inhale to expand your belly, then exhale and contract your abs toward your spine. (B) Bend your knees to lower into a squat. Straighten your legs to standing and contract your abs even more deeply toward your spine. Repeat 20 times.