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Either standing or sitting upright with a dumbbell in each hand.
Starting position- arms straight down at side. Keep palms faced down throughout entire exercise.
Finishing position- arms straight out with the dumbbells at shoulder height. Motion should be slow and controlled. Don't swing or use your legs.

Note: The movement can be varied to work the back deltoid as well. Do this by leaning forward at about a 45 degree angle and let your hands hang in front of you. The finishing movement should be the same.

Picture Source: Getting Stronger by Bill Pearl and Gary T. Moran, Ph.D.