The Swiss ball Jackknife is great movement for targeting your lower abdominals. Plus, since the ball is unstable, your entire core has to work to maintain the position of your body.
Start by getting into a pushup position with the tops of your feet on a Swiss ball. Your body should form a straight line from your toes to your shoulders with your hands positioned just slightly wider than your shoulders.
Keeping your back flat and abs tight, bend your knees and roll the ball toward your torso. Squeeze your abs for a second and then roll the ball back to the starting position. Try to do 3-4 sets of 20-25 reps with only about 30 seconds of rest between sets.
One other tip: Keep the movement smooth and be sure to keep your spine in a neutral position. You should not feel like your hips are dropping.
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