An overhead press pattern will engage the front and mid deltoids, and the use of dumbbells allows you to manipulate wrist and elbow position in order to avoid undue shoulder joint stress from the load being used.

A ladder set brings the target muscles to great levels of fatigue by pushing past a typical rep threshold with a heavier-than-normal load. Using a weight that's your 12 to 15 rep max, focus on sets of 2, 3, 5, and 10 reps with short 10-second breaks between each set.

The video shows one full ladder, which makes one set.

Related:  Ladder the Deadlift

Related:  The 4 Best Compound Sets for Size