Seated dumbbell/barbell shoulder press: correct technique, muscle activation, common mistakes and variations.

Shoulder press (shoulder press / dumbbell press) — the main exercise for shoulder muscle mass and strength. Performed seated on a bench with back support, pressing dumbbells or a barbell from shoulder height overhead. It is a safer alternative to the standing overhead press, especially for those with back problems.
Anterior and lateral deltoids, triceps.
Upper chest, trapezius, serratus anterior.
Multi-joint compound exercise. Primary shoulder mass exercise.
Intermediate. Requires shoulder stability and good technique.
| Muscle Group | Muscle | Role |
|---|---|---|
| Shoulders | Anterior deltoid | Primary Engine |
| Shoulders | Middle deltoid (medial deltoid) | Secondary pressing |
| Upper Arms | Triceps brachii | Elbow extension |
| Chest | Upper chest | Assists in the initial phase |
| Back | Trapezius, serratus anterior | Scapular stabilization |
| Variation | Description | Difficulty |
|---|---|---|
| With dumbbells (standard) | Most popular variation. Greater range of motion, freer movement. | Lightweight |
| With a barbell | Allows pressing heavier weights. Smaller range of motion. | Intermediate |
| Arnold Press | Dumbbells rotate — starting with palms facing you, rotating forward while pressing. | Intermediate |
| Behind the neck | Pressed from behind the head. Greater demand on shoulder mobility. | Hard |
| Single-arm | Each arm separately. Corrects imbalance, more core work. | Intermediate |