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Sit on top of a stability ball with your feet and legs together, and hold a set of dumbbells with your palms facing inward. Hinge forward from your hips with a flat back so your torso rests on top of your thighs and the weights are resting on the floor with your arms straight. Drive your elbows up and back and pull your shoulder blades in toward one another to pull the weights up toward your flanks, then slowly lower to the start.