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Muscle group: Abdominal

Steps

Centre the lower back on a stability ball with feet planted and knees about 90 degrees. Arms may cross the chest or fingers rest lightly beside the ears. One rep curls the head, shoulders and chest upward using the abs and lowers under control. Lower back remains on the ball; no neck pulling or full sit-up. This is an unweighted bodyweight variant; there is no kilogram leaderboard.

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