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Stability-Ball One-Arm Alternating Chest Press
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Lie faceup on a stability ball with your upper back and shoulders in the center and your hips lifted to align with your knees and shoulders. Hold a set of dumbbells straight up over your shoulders with your palms facing away from you, then slowly lower one dumbbell down and away from the other until your elbow makes a 90-degree angle while holding the other one straight. Press it back to the start and continue, alternating arms.