STARTING POSITION:
Select the appropriate weight of the dumbbells. Lie on a flat bench facing the floor. Your legs should be on the bench. Grab the dumbbells with prone grip. Your arms should be perpendicular to the floor.
MOVEMENT:
Without moving any other part of the body, lift the weights until the arms are parallel to the floor while you exhale. Return to the starting position with a smooth movement while you inhale. While your are doing the exercise, move only the shoulder joint, make sure you don't move any other part of your body.
TIPS: During the descent, focus on slow and controlled movement.