What you'll gain

• Builds the rear delts for balanced shoulder development.

• Strengthens the muscles between the shoulder blades for better posture.

• Counters the forward-shoulder pull from heavy pressing volume.

Step-by-Step Instructions

1. 1

   Stand tall with a dumbbell in each hand, then hinge at the hips until the torso is nearly parallel to the floor.

2. 2

   Let the arms hang straight down beneath the shoulders, palms facing each other, with a slight bend in the elbows.

3. 3

   Brace the core, set a flat back, and lock the slight elbow bend in place for the rest of the set.

4. 4

   Open the arms out to the sides in a wide arc, leading with the elbows toward the ceiling.

5. 5

   Squeeze the rear delts and the middle of the back together at the top of the lift, pausing briefly.

6. 6

   Lower the dumbbells under control over 2 to 3 seconds back to the hanging start position.

Common Mistakes

• Standing too upright, which turns the lift into a half lateral raise and misses the rear delts.

• Pulling the dumbbells back like a row, swapping rear-delt isolation for mid-back rowing work.

• Shrugging the shoulders at the top, which trades rear-delt work for trap engagement.

• Rounding the lower back at the hinge, which loads the spine instead of the working muscles.

About This Exercise

The dumbbell rear delt fly is the standing bent-over version of the reverse fly. Hinging at the hips and opening the arms wide loads the rear delts and the muscles between the shoulder blades, building the back-of-shoulder mass that balances out the front-delt work everyone already gets from pressing. For app builders, this is a foundational rear-delt exercise that belongs in any complete shoulder library. Ship it in pull-day flows, postural training tracks, and hypertrophy programs that want symmetric shoulder development front-to-back. It's also a strong educational piece for trainer content explaining why most lifters' rear delts lag behind — and how to fix that with a single dumbbell exercise.

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