This exercise uses a ball to isolate and work the lower abdominal muscles.
· Lay down as if you were performing a pushup.
· Place your feet and shins over an exercise or stability ball.
· Keeping your back straight and supporting your weight on your hands, pull your knees towards your chest, so the ball rolls forward under your ankles.
· Crunch your abs and then roll the ball back to starting position straighten your legs.
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