Stability-Ball Close-Grip Dumbbell Press
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 inward. Keep your arms in close to your sides as you bend your elbows to lower the weights toward your body. Extend your elbows forcefully to return to the start.