STARTING POSITION:
Stand straight with your feet shoulder width apart. Select the appropriate weight of the dumbbells. Grab the dumbbells at the sides of your shoulders as you keep the elbows bent and in line with your torso. Your hands should be slightly wider than shoulder-width apart. Contract your pelvic floor and core while keeping your chest up.
MOVEMENT:
Extend your arms to push the dumbbells straight up until your elbows are extended but not locked out. Slowly lower the weight until your hands are just above your shoulders. Keep constant tension in the shoulders. Make sure you don't arch your back when you perform the exercise.
TIPS: Alter your grip (neutral, wide, narrow, and reverse) from time to time to train the muscles from multiple angles. The exercise key is quality over quantity. The trick is to perform the exercise using proper form.