Lateral Raise with Arm Rotation
This move is weirdly difficult—or perhaps deceptively difficult. Stand with your feet together, knees slightly bent, holding a dumbbell in each hand. Bring the dumbbells up beside you, keeping your arms bent and your palms facing forward. From there, straighten both arms, rotating the weights so that your palms are facing downward. Repeat this movement, making sure to squeeze your shoulder blades together when your arms are bent beside you. Bonus-This move also works your triceps!