Seated Bent-Over Rear Delt Raise

The seated bent-over rear delt raise is the most evidence-supported open-chain isolation exercise for the posterior deltoid. Performed seated with the torso hinged forward until parallel to the floor, the movement targets the posterior deltoid and lateral deltoid simultaneously through horizontal abduction against gravity. The near-zero anterior deltoid activation (5% MVIC) confirms that the bent-forward torso position effectively eliminates anterior deltoid contribution present in upright movements.

Execution

1. Sit at the end of a bench with dumbbells hanging between the legs
2. Hinge the torso forward until nearly parallel to the floor; keep the spine neutral (do not round)
3. With elbows slightly bent and fixed, raise the dumbbells laterally in an arc until arms are parallel to the floor
4. Focus on "opening" the shoulder blades apart rather than shrugging
5. Lower under control; do not let the dumbbells pull the shoulders forward at the bottom

What the EMG Data Shows

Sweeney 2014 (n=16, 70% 1RM):

Muscle	Activation
Posterior deltoid	73.0 ± 9.9% MVIC
Lateral deltoid	70.0 ± 14.6% MVIC
Anterior deltoid	5.0 ± 4.1% MVIC

The posterior and lateral deltoid values are nearly identical, confirming that bending the torso 90° forward aligns both heads with the gravity vector. Compared to the standard lateral raise (posterior delt only 33% MVIC in Sweeney 2014), the torso-forward position more than doubles posterior delt activation without changing the load.

Torso Angle Is the Key Variable

By bending 90° forward, the horizontal plane of shoulder abduction becomes the line of action against gravity. The posterior deltoid, which performs horizontal abduction, now drives directly against gravitational resistance rather than acting as a stabilizer. Sitting removes lower-body compensation and prevents upper-body momentum.

Variations

Variation	Key difference	Best for
Face pull	Cable; adds external rotation	Shoulder health; rotator cuff involvement
Chest-supported rear delt raise	Forehead on bench; eliminates spinal erector demand	Lumbar sensitivity
Cable rear delt fly	Constant tension	Lengthened-position load

For system-specific training applications, see each system's lens entry.