Stand with your feet hip-distance apart. Hold a dumbbell in each hand so your palms face in toward the sides of your body.
With control, keep your arms straight (but don't lock your elbows), and as you inhale, raise your arms up, toward the ceiling. You want your palms to be facing down and your arms to be parallel to the floor.
Then as you exhale, slowly lower your arms back to your body. You should be able to see your hands in your peripheral vision; your arms aren't directly out to the side, but slightly forward.