STARTING POSITION:
Select the appropriate weight of the dumbbells. Sit down on a bench with back support with a dumbbell in each hand on either side of your hips. You should use a supine grip. Contract your pelvic floor and core while keeping your chest up.
MOVEMENT:
Lift the right dumbbell in front of you until your arm is parallel to the floor while you exhale. Return to the starting position in a smooth movement while you inhale and alternate with the other arm.
TIPS: While your are doing the exercise, move only the arms, make sure you don't move any other part of your body. The exercise key is quality over quantity. The trick is to perform the exercise using proper form.