Middle Back Shrug
A pure scapular retraction: lying face-down on an incline bench with a dumbbell hanging in each hand, you squeeze the shoulder blades together with the elbows locked straight. No elbow bend means no lats and no biceps — the rhomboids and mid-traps have to do all of it, at a very light load.
Own the movement
Set up first, then execute. Every cue below is something you can check on your next set.
Before the first rep
- Set an incline bench to roughly 30-45 degrees and lie face down with your chest on the pad and chin clear of the top.
- Pick dumbbells far lighter than you expect — 5-10 kg is a hard set when the elbows stay locked.
- Let the arms hang straight down towards the floor with palms facing each other.
- Let the shoulder blades slide fully forward at the bottom so there is somewhere to retract from.
- Plant your feet and press your chest into the pad so your torso cannot rock.
Every rep
Breathing & tempo — Exhale as you squeeze the blades together, inhale as you release. Two seconds squeezed, two seconds released, no fast reps at any point.
Sets, reps & load
Where to start, and what to change when it stops being hard.
Start with 4-6 kg dumbbells and expect that to be plenty. Progress by lengthening the top hold from one to three seconds and adding reps before adding weight; a jump above roughly 12 kg per hand almost always means the elbows have started bending. Two dumbbells you can hold at full squeeze for three seconds is the marker.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Halve the weight and lock the elbows out visibly straight before each rep. Film one set from the side; if you see elbow angle change, the dumbbells are too heavy.
Cue the blades to slide towards the spine, not upward. Keep the neck long and the shoulders away from the ears through the whole hold.
Hold two seconds at the top and two seconds at the bottom. The tempo is the exercise; without it there is nothing here.
Cap it at two or three sets as a finisher and spend the session's real effort on rows and pull-ups. This drill supports those, it does not replace them.
Why bother
Every row is two movements stacked: the shoulder blades retracting, then the elbows bending. Strong lats and biceps can hide a lazy retraction, which is why plenty of people row heavy and still have a flat mid-back. Locking the elbows straight removes the second half and leaves only the part most lifters skip.
The range is short — a few centimetres of blade travel is the whole rep — so the weight is deliberately small. A pair of 5-10 kg dumbbells is a genuinely hard set here, and going heavier only reintroduces the elbow bend you locked out in the first place.
Where it fits
Finisher at the end of a pull day, 2-3 sets of 12-20 with a two-second hold at the top, or as an activation drill of one light set before your heavy rows so you can feel where the pull should start. It is not a main movement and treating it as one wastes the session.
If this one isn't it
No kit, too hard, or too easy — here's where to go instead.
Same job, different kit
Start here instead
Asked and answered
How heavy should the dumbbells be?
Much lighter than your instinct says. The rep is a few centimetres of shoulder-blade travel with locked elbows, so 5-10 kg per hand is a genuinely hard set of 15. If you are reaching for 20 kg, your elbows are bending and you are doing a short-range row instead.
Will this fix my rounded posture?
It strengthens the muscles that hold the blades back, which helps, but posture is mostly a habit and a mobility question rather than a strength one. Pair this with time out of a chair and some thoracic extension work. Expect it to make holding a good position easier, not to change your resting shape on its own.
Is this the same as a rear delt fly?
No. A rear delt fly raises the arms out to the side and moves at the shoulder joint. This moves only the shoulder blade across the ribcage, with the arm hanging still. They feel similar because both burn in the same region, but the fly trains the rear delt and this trains the rhomboids and mid-traps.
Can I do it on a flat bench?
You can, but the incline is better because it lets the arms hang truly vertical with the dumbbells clear of the floor. On a flat bench the plates ground out early and you lose the release half of the rep. If a flat bench is all you have, elevate it on blocks.