Step-by-Step Instructions

1
Stand with feet hip-width apart and hinge at the hips until your torso is nearly parallel to the floor, maintaining a flat back and slight knee bend.
2
Hold a dumbbell in each hand hanging directly below your shoulders with palms facing each other and a slight bend in the elbows.
3
Raise both dumbbells outward in a wide arc, leading with the elbows and pinky-side of the hand, until your arms are roughly parallel to the floor.
4
Focus on initiating the movement from the rear delts, not by squeezing the shoulder blades — retraction is a result, not the driver.
5
Pause at the top for 1-2 seconds, then lower the dumbbells slowly under control to the hanging start position.
6
Keep your torso angle fixed throughout the set — avoid rising up from the hinge to generate momentum.

Common Mistakes

Rising out of the hip hinge during the raise, which reduces the effective angle and shifts load to the lateral delts and traps.
Using excessive momentum by bouncing the dumbbells at the bottom rather than lifting from a dead stop.
Retracting the scapulae too aggressively, which turns the exercise into a row-like movement dominated by the mid-back instead of the rear delts.
Choosing too heavy a weight, which forces compensatory shrugging and robs the posterior deltoids of effective stimulus.

About This Exercise

The dumbbell rear delt fly is performed in a bent-over position — either standing with a hip hinge or seated leaning forward — to isolate the posterior deltoid, rhomboids, and middle trapezius through horizontal abduction. This exercise is critical for shoulder balance, injury prevention, and developing the three-dimensional rear-delt look that separates trained physiques. Light to moderate loads with controlled tempos yield the best results, as the rear delts are small muscles easily overwhelmed by trap compensation.

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