The Dead Bug With Ball exercise works your abs.
You Can Do It! Lose 10, 15, 20 Pounds. Dead Bug with Ball: The dead bug is a great move for flat abs. You wanna really press into the ball with your knees and hands throughout. Slowly extend your right arm and the left leg towards the floor then press them back into the ball. You're going to do 10 reps with this arm and leg, then switch sides.