This Trainer's 6-Move Ab Workout For a Stronger Core Takes Just 10 Minutes

• Begin in an elbow plank with your forearms resting on the top of the stability ball and your feet wide.
• Keeping your core strong and your body still, use your arms to roll the ball in a small clockwise circle. Complete 12 reps here, then do 12 reps in a counterclockwise circle.
• James said your body should be completely engaged, and you "should feel your core working alongside your shoulders and quads."

Alternate move: plank hold on stability ball