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Lie faceup on a flat bench with your feet flat on the floor and your back arching naturally. Hold a dumbbell in each hand over your shoulders with your palms facing inward. Keep your arms in close to your sides as you bend your elbows and lower the weights toward your shoulders. Extend your arms and press them back to the start. Then keep a slight bend in your elbows as you open your arms to the sides and lower the weights to about shoulder height. Bring them back to the start and squeeze at the top to complete one rep.