Cable External Rotation
Cable external rotation is a rotator cuff exercise in which you turn your forearm outwards against a cable while your elbow stays at your side. It works the infraspinatus and teres minor, the muscles that rotate the upper arm outwards, and is a common shoulder accessory and warm-up.
Also called: External Rotation, Shoulder External Rotation, Standing Cable ER, Cable Shoulder External Rotation · Equipment: cable · Pattern: isolation
Step by step
- Set a single handle on the cable at elbow height. Stand side-on to the machine and hold the handle in the hand farther from it.
- Bend your elbow to 90° and tuck it against your side, with a rolled towel between your elbow and ribs if you like. Your forearm starts across your stomach.
- Stand tall with your shoulder blade gently set back and down, and step away until the cable is taut.
- Keeping your elbow against your side, rotate your forearm outwards, away from your body, as far as it comfortably travels.
- Pause briefly at the end of the rotation.
- Rotate back slowly to the start, keeping tension on the cable.
- Finish the reps, then turn around and repeat with the other arm.
- Elbow pinned to your side
- Forearm swings out like a door
- Towel stays trapped under your elbow
- Wrist straight, forearm level
- Slow and smooth both ways
In VALDA, these cues are one tap away on the exercise while you train.
What it trains
| Muscle | Role | Evidence |
|---|---|---|
| Rotator cuff: infraspinatus | Prime mover | B |
| Rotator cuff: teres minor | Prime mover | B |
| Posterior deltoid | Secondary | B |
| Rotator cuff: supraspinatus | Stabiliser | C |
| Trapezius: middle | Stabiliser | D |
Evidence grades: A = strong research base · B = good · C = limited · D = coaching consensus.
What goes wrong, and the fix
Elbow drifting away from the side
Fix: Keep your elbow against your ribs, or trap a rolled towel there.
Twisting the torso
Fix: Keep your hips and chest facing forward and move only the forearm.
Forcing the end of the range
Fix: Rotate only as far as your forearm travels with your elbow still at your side.
Weight too heavy
Fix: Choose a weight you can rotate slowly for every rep with no body movement.
Letting the cable pull you back
Fix: Rotate back slowly, keeping the cable taut all the way in.
What the research says
Rehab & prehab · first choiceGeneral fitness · first choiceStrengthSport performanceEndurance
- Muscle activity — A fine-wire EMG study of seven external-rotation exercises found the highest infraspinatus and teres minor activity with the elbow at the side, lying on the side, and less deltoid activity than in raised-arm positions.
- Arm position — A review of shoulder-exercise research reports that external rotation with the arm raised recruits the posterior cuff together with the shoulder-blade muscles.
- Load and reps — Research finds lighter, higher-rep work favours local muscular endurance. A common approach is 2–3 sets of 10–20 controlled reps with a light weight. There is no direct research on dosing this exercise.
- Progression — The weight stack allows small, repeatable jumps in load from session to session.
Swap it mid-workout
- Reverse Pec Deck
- Cable Bent-Over Lateral Raise
- Cable Face Pull
- Cable Rear Delt Fly
- Dumbbell Rear Delt Fly
- Barbell High Pull
With VALDA Pro, FLEX offers alternatives like these when you swap an exercise mid-workout.
Log the cable external rotation in VALDA, with these cues one tap away while you train and your history for it in one place.
General information about exercise technique, not medical advice. If you have an injury or a health condition, your healthcare provider is the right person to ask.