Step-by-Step Instructions

1
Lie face down on a flat bench with your chin just past the edge, holding a light dumbbell in each hand with arms hanging straight down, palms facing each other.
2
Set your shoulder blades in a neutral position and maintain a slight bend in the elbows (15-20 degrees), locked throughout the set.
3
Raise both dumbbells outward in a wide arc, leading with the rear delts, until your arms are roughly parallel with the floor.
4
Squeeze the shoulder blades together at the top and hold for 1-2 seconds to maximize rear-delt and mid-trap engagement.
5
Lower the dumbbells slowly under control over 3 seconds, resisting gravity rather than letting the arms drop.
6
Keep your forehead on the bench and avoid lifting your head or arching your neck during the movement.

Common Mistakes

Using too heavy a weight, which forces the traps and rhomboids to dominate the movement while the posterior delts remain understimulated.
Shrugging the shoulders toward the ears during the raise, which over-recruits the upper traps.
Bending the elbows progressively during the concentric to shorten the lever arm and cheat the weight up.
Lifting the chest off the bench to generate momentum, which defeats the purpose of the prone stabilization.

About This Exercise

The dumbbell laying reverse fly is performed face-down on a flat or slightly inclined bench, using gravity to create a strict isolation environment for the posterior deltoids, rhomboids, and middle trapezius. The prone position eliminates the lower-back involvement and momentum cheating common in standing or seated reverse fly variations. This exercise is highly effective for building rear-delt thickness, improving scapular retraction strength, and balancing the shoulder girdle in press-dominant programs.

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