Reverse Flyes With External Rotation
This variation takes the standard reverse fly and adds an external rotation at the top of each rep, turning the palms upward as the arms reach the sides. That extra twist brings the rotator cuff, specifically the muscles behind the shoulder that rotate the arm outward, into a movement that would otherwise train the rear deltoid alone. It's a step up from the plain reverse fly, built for lifters who want more direct rotator cuff work layered onto their rear delt training rather than a separate exercise for it.
Why it works
A plain reverse fly raises the arms out to the sides but doesn't ask the shoulder to rotate, so the infraspinatus and teres minor, the rotator cuff muscles responsible for turning the arm outward, get only light, incidental work. Adding an external rotation at the top of the raise, where the forearm turns so the palm faces up or forward, recruits those muscles directly alongside the rear deltoid. Combining both actions in one movement trains the rear shoulder's raising strength and its rotational control together, which is closer to how the shoulder actually has to stabilize during real pulling and throwing motions.
Set up
- Choose dumbbells lighter than you'd use for a plain reverse fly; the added rotation is a harder coordination task.
- Hinge forward from the hips until your torso is close to parallel with the floor, with a soft bend in your knees.
- Let the dumbbells hang below your shoulders with your palms facing each other and your elbows slightly bent.
- Keep your neck neutral and your core lightly braced before the first rep.
How to do it
- Raise both dumbbells out to the sides in a wide arc, leading with your elbows as in a standard reverse fly.
- As your arms approach shoulder height, rotate your forearms so your palms turn to face forward or slightly upward.
- Finish the rep with your arms roughly level with your shoulders and your palms rotated, feeling the added tension across the back of the shoulder.
- Pause briefly at the top of the combined raise and rotation.
- Reverse the rotation first, turning your palms back to face each other as you begin lowering the dumbbells.
- Lower the dumbbells back down along the same arc under control.
Form cues
- Raise first, rotate at the top.
- Rotate the forearm, not just the wrist.
- Small, controlled range throughout.
- Reverse the rotation before lowering.
Breathing: Exhale as you raise and rotate, inhale as you rotate back and lower the dumbbells.
Common mistakes
Rotating only at the wrist instead of turning the whole forearm.
Fix: Let the rotation come from the forearm and shoulder, not a quick flick of the wrist; a wrist-only twist skips the rotator cuff muscles this exercise is meant to train.
Trying to combine the raise and rotation into one rushed motion.
Fix: Slow down and treat it as two connected steps: raise the arms, then rotate at the top, rather than blending them into a single fast swing.
Using a weight heavy enough that the rotation disappears under fatigue.
Fix: If the rotation stops happening by the last few reps of a set, the load is too heavy; drop the weight until you can complete every rep with the full turn.
Standing too upright instead of hinging forward at the hips.
Fix: Keep the same forward hinge as a standard reverse fly; standing tall removes the rear delt emphasis this movement depends on.
How to program it
- Two or three sets of 10 to 15 reps is plenty, since the coordination demand of the rotation matters more here than raw volume.
- Once or twice a week is enough, since this asks more precision from the rotator cuff than a simple raise and doesn't need high frequency to be effective.
- Use it after your main shoulder or pulling work, when you have the focus left to control the rotation cleanly instead of rushing through it.
- If your rotator cuff already gets direct work elsewhere in your program, this can replace a plain reverse fly rather than being added on top of it.
Safety notes
- Keep the weight light enough that you never feel a pinch or catch at the front or back of the shoulder during the rotation.
- Stop the exercise if the rotation causes any sharp or clicking sensation rather than normal muscle fatigue, and check your range and load before continuing.
Exercise profile
- Force
- Pull
- Mechanics
- Isolation
- Category
- Strength
Frequently asked questions
What does adding external rotation to a reverse fly change?
It brings the rotator cuff muscles, mainly the infraspinatus and teres minor, into a movement that would otherwise train the rear deltoid alone, combining raising strength with rotational control.
How much weight should I use for this exercise?
Go lighter than your plain reverse fly weight. The rotation is a coordination challenge first, and a heavy load usually makes the rotation disappear under fatigue.
Reverse fly vs reverse fly with external rotation: which should I do?
Start with the plain reverse fly to build the raising pattern, then add the rotation once that feels controlled, since it layers rotator cuff work on top of the same base movement.
Why does my shoulder feel a slight pinch during the rotation?
That usually means the weight is too heavy or the range of motion is too large for now. Lighten the load and shorten the rotation slightly, and stop the exercise if the sensation continues.