The Best Shoulder Exercises for Mass and Definition.

Upright row: The upright row is another compound exercise that works the entire shoulder complex, including the deltoids, traps, and biceps. It is typically performed with a barbell or dumbbells.
Seated barbell shoulder press: exercise that targets the entire shoulder complex, including the deltoids, rotator cuff, and upper back muscles. It is performed while seated on a weight bench with a barbell and is a great exercise for building mass and strength in the shoulders.
Dumbbell shrug: The dumbbell shrug is a simple exercise that primarily works the traps, but also engages the deltoids and upper back muscles.
Dumbbell lateral raise: The dumbbell lateral raise is a great exercise for isolating the lateral head of the deltoids. It can be performed standing or seated, with lighter weights for higher reps or heavier weights for lower reps.
Rear delt fly: The rear delt fly is an isolation exercise that targets the rear head of the deltoids. It can be performed with dumbbells, cables, or resistance bands.