Cannonball delts or delts like a bunch of bananas(see below). Arnold invented the shoulder exercise he called “The Arnold Press”.
The Arnold Press:
Start with two dumbbells under chin level(like the end position of a chin up) have your palms facing towards you.
Then press the dumbbells up and rotate your palms to face forward as you reach the full extension of the press(don’t fully lock out arms).
So, you’re doing a variation on dumbbell presses. You start at the bottom of the exercise with your palms facing towards you. You finish the rep with your palms facing away from you, arms over head, like a normal press. You’re rotating the hands throughout the exercise.
After the press, go back to starting position with palms towards you. Repeat to failure(until you can do no more).
Arnold’s Shoulder Routine:
Arnold Press…… 4–5 sets of 8–10 reps
Standing Side Lateral……… 4–5 sets of 8–12 reps
Seated Rear Lateral……….. 4–5 sets of 8–12 reps
Cable Side Lateral………… 3–4 sets of 10–12 reps