Cable or band
Rotating the forearm outward with the elbow at the side isolates the rotator cuff's external rotators.
| Muscle | Role | Action |
|---|---|---|
| Infraspinatus | Primary | Laterally rotates the arm and stabilises the shoulder joint |
| Teres minor | Primary | Laterally rotates the arm and stabilises the shoulder joint |
| Posterior deltoid | Secondary | Extends, horizontally abducts and laterally rotates the arm |
Primary muscles are the prime movers; secondary muscles assist or stabilise. The balance shifts with grip, stance, range of motion and technique.