This upper body move works your shoulders and your upper back.
-Serving Trays: Grab a pair of light dumbbells and stand with your feet shoulder-width apart. Bend your elbows and hold the weights palms up, like you're carrying a tray. Now, keeping your shoulders down, bring your elbows forward and rotate your arms to the side until your thumbs point to the wall behind you. Repeat for 10 reps. Be sure to keep your upper arms close to your sides. Your abs should be engaged and your chest lifted. For the 2nd set of Serving Trays, step up the difficulty level by balancing on your left leg for 5 reps. Remember to engage your abs, keep your chest lifted, and your shoulders down. Then switch legs and balance on your right leg for 5 reps. For the 3rd set of Serving Trays, stand on a thin, folded yoga mat or bath towel, balancing on your left leg for 5 reps. This extra balancing challenge increases the difficulty level yet again. Switch to your right leg for the final 5 reps. Be sure to keep your abs engaged, your chest lifted, and your shoulders down. This move works your shoulders and your upper back.