Kneel facing a stability ball with your hands clasped and your forearms on top of the ball Roll forward and straighten into a modified plank position. Resting on your forearms, brace your abs and hold for 5 seconds 10 reps, 2 sets
Ball Lift: Stand with feet hip-width apart, holding a stability ball behind you an inch from butt. Keeping chest up, draw abs in tight, squeeze shoulder blades together and raise ball behind you (as shown); lower to start. Do 20 lifts. Works abs and arms.
Kneel on ground with knees about shoulder-width apart, holding ball overhead. Pull in abs and hold hips still. Lean to left (as shown), return to center, then lean to right. Next, bend over to lower ball in front of you (back straight). Rise up so ball .