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Using an exercise ball will make the basic abdominal crunch more effective. Lie on your back, bend your hips and knees 90 degrees, and rest your lower legs on the ball. Curl up until your shoulder blades clear the floor but your lower back is flat on the floor, then return. Using a ball makes it easier to use the correct range of motion and trains core stability because of the slight instability introduced by the ball.
|Jennifer Mathes, Ph.D.|