Dumbbell Rear Delt Fly (45 Degrees)

Dumbbell Rear Delt Fly (45 Degrees) Exercise Description

The Dumbbell Rear Delt Fly (45 degrees) targets the posterior deltoids through shoulder horizontal abduction while the torso is hinged roughly halfway between upright and parallel to the floor. The aim is to move the upper arm at the shoulder with minimal trunk motion, maintaining a neutral spine and steady scapular position. Middle trapezius and rhomboids assist by stabilizing the shoulder blades, and the rotator cuff helps control humeral rotation and joint centering. The 45-degree hip hinge provides space for the arms to arc outward while allowing solid spinal alignment. Keep a slight, fixed elbow bend to prevent elbow flexion and keep the movement focused at the shoulder. Emphasize controlled raising and lowering without momentum, avoiding shrugging or excessive scapular retraction so the rear delts remain the primary movers.

Muscle Groups: Delts, Shoulders
Target Muscles: Deltoid - Posterior
Assisting Muscles: Deltoid - Lateral
Stabilizing Muscles: Infraspinatus, Longissimus, Rhomboid Major, Teres Minor, Trapezius - Middle Fibers
Body Area: Upper Body
Body Parts: Shoulders
Body Surface: Back
Body Symmetry: Bilateral
Equipment: Dumbbell
Exercise Patterns: Other
Exercise Type: Strength
Functional Grouping: Shoulder Extensors
Joint Involvement: Single-joint
Muscle Location: Rear Shoulder
Movement Direction: Other
Muscle Position: Posterior
Gender: Male

How To Do The Dumbbell Rear Delt Fly (45 Degrees) Exercise

‘- Stand with feet hip-width and hold dumbbells with a neutral grip at your sides.
– Hinge at the hips to about a 45° torso angle; keep knees soft and spine neutral from head to pelvis.
– Set shoulders by gently drawing shoulder blades back and down; avoid over-squeezing.
– Let dumbbells hang under the shoulders; keep elbows slightly bent and fixed.
– Initiate by moving upper arms out and slightly back in a wide arc; lead with the elbows, wrists neutral.
– Lift until upper arms reach shoulder height or align with your torso; avoid shrugging or arching the back.
– Pause briefly to eliminate swing, then lower under control to the start.
– Keep torso still, ribs down, weight over mid-foot, and neck in line throughout.

Dumbbell Rear Delt Fly (45 Degrees) Tips

‘- Hinge at the hips to about a 45° torso angle while keeping your spine neutral from head to pelvis.
– Gently draw your shoulder blades back and down, but avoid over-squeezing or excessively retracting them.
– Let the dumbbells hang directly under your shoulders with a neutral grip before starting each rep.
– Keep your elbows slightly bent and fixed so the movement comes from the shoulder, not the elbow.
– Initiate each rep by moving your upper arms out and slightly back in a wide arc, leading with the elbows.
– Raise your arms until they reach about shoulder height or line up with your torso, without shrugging.
– Keep your torso still with ribs down, weight over your mid-foot, and neck in line as you lift and lower.
– Pause briefly at the top to eliminate swing, then lower the weights under control without using momentum.
– Focus on steady scapular position so the rear delts remain the primary movers.

Dumbbell Rear Delt Fly (45 Degrees) Beginner Introduction

The Dumbbell Rear Delt Fly (45 degrees) is a free-weight movement that highlights the back of the shoulders while also involving the upper back and small stabilizers around the shoulder joint. It takes place in a standing, bent-over position, with the torso angled about halfway between vertical and fully folded toward the floor, so the arms can travel in a broad sweep out to the sides. This body angle provides room for the weights to arc outward and slightly behind the body while the back stays long and aligned.

During the lift, the upper arms move away from the torso at shoulder level, driven mainly by the rear shoulders, while the upper back contributes by steadying the shoulder blades. A slight, consistent bend at the elbows directs effort into the shoulders rather than turning the movement into an arm exercise. The action highlights smooth, deliberate raising and lowering of the dumbbells instead of using speed or swinging. This creates a precise flying motion that builds strength and awareness in the rear shoulders and upper back while supporting stable posture through the trunk.