15-Minute Crunch-Free Ab Workout
Move 4: Upright Push-Up
(A) Stand at arm’s length from a wall, with palms flat against the wall. Inhale to expand your belly, then exhale and draw it toward your spine. (B) Press against the wall in a push-up, keeping your elbows close to your sides. As you push back to the starting position, contract your abs even more deeply toward your spine. Repeat 20 times.