Kneel in front of a stability ball with your forearms and elbows on the ball, hands clasped. Roll ball forward until your legs are extended and your body is in plank position, toes tucked. Your shoulders should be stacked directly above your elbows, chest lifted off the ball, and neck in line with your spine. Brace your abs and make small circles to the right with your forearms, as if stirring a pot. Do 15 reps, then repeat, making circles to the left.
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