Crunch (on stability ball, arms crossed)

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Instructions Preparation Sit on exercise ball. Walk forward on ball and lie back on ball with shoulders and head hanging off and knees and hips bent. Gently hyperextend back on contour of ball. Cross arms on chest. Execution Flex waist to raise upper torso. Return to original position. Repeat. Comments Some individuals may experience low back discomfort if hips are not bent so they must use smaller ball size or lower their hip position on ball. See Spot Reduction Myth. Easier Movement can be made easier by positioning hips low on ball or placing arms further down to sides of waist. See Arm Position During Waist Exercises. Harder Exercise can be made more challenging by using positioning ball lower on back and hips higher or placing hands behind neck or beside head. hand behind neck

Classification  Utility: Auxiliary  Mechanics: Isolated  Force: Pull Muscles Target Rectus Abdominis Synergists Obliques Stabilizers No significant stabilizers