Exercise guide
Seated External Shoulder Rotation On Chair
- Beginner
- Isolation
- Rep-based
- Back
- Shoulders
- Upper arms
This isolation exercise targets the infraspinatus and teres minor of the rotator cuff along with the posterior deltoids and trapezius to improve shoulder stability and postural alignment. It is highly effective for correcting rounded shoulders and strengthening the stabilizers of the glenohumeral joint.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Sit upright on a chair or flat bench with your feet planted firmly on the floor and your spine neutral.
- Bend your elbows to 90 degrees and tuck them firmly against your ribcage.
- Position your forearms parallel to the floor with your palms facing each other in a neutral position.
How to do it
- Exhale as you slowly rotate your forearms outward away from your body, keeping your elbows pinned to your sides.
- Squeeze your shoulder blades together at the peak of the movement to engage the trapezius and posterior deltoids.
- Inhale as you slowly return your forearms to the starting position in front of your torso.
- Maintain a controlled tempo of 2 seconds for the outward rotation and 2 seconds for the return.
Form checklist
- Keep your elbows glued to your ribs; do not let them flare out.
- Maintain a tall chest and avoid shrugging your shoulders toward your ears.
- Ensure the rotation occurs at the shoulder joint rather than just moving the wrists.
- Keep your head in a neutral position, looking straight ahead.
Pro tips
- Imagine you are holding a rolled-up towel between your elbows and your torso to ensure perfect isolation of the external rotators.
- Focus on the mind-muscle connection by visualizing the back of your shoulder pulling the arm outward.
Make it harder
- Add a 3-5 second isometric hold at the point of maximum external rotation.
- Apply manual resistance by using your opposite hand to push against the rotating forearm.
Frequently asked
- What muscles does the seated external shoulder rotation on chair work?
- The seated external shoulder rotation on chair primarily targets the rotator cuff, and also works the deltoids and trapezius as secondary muscles.
- What equipment do you need for the seated external shoulder rotation on chair?
- The seated external shoulder rotation on chair requires no equipment — just your body weight.
- Is the seated external shoulder rotation on chair good for beginners?
- Yes. The seated external shoulder rotation on chair is a beginner-friendly movement and a strong foundation to build on.