An isolation exercise to develop the deltoids. It mainly works the rear deltoids.
Lie down on a bench with dumbbells in each hand.
As you exhale, lift your arms bent slightly at the elbows to the sides to shoulder level.
Pause for 1-2 seconds at the top and slowly return to the starting position.
Do not swing your torso and keep your back straight.
Do not try to push the dumbbells up - you risk hurting your ligaments.
Do not bend your elbows, try to keep them as straight as possible.