STARTING POSITION:
Lie facing down on a flat bench. Your feet should be touching the floor. Your head should facing down. The arms should be perpendicular to the floor. Place your thumbs up. Retract your shoulder blade.
MOVEMENT:
Lift the arms until they are parallel to the floor and your body form the I letter while you exhale. Return to the starting position with a smooth movement while you inhale.
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.