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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 to the sides and pull the weights upward until your arms make 90-degree angles at peak contraction, then slowly lower to the start.