Side-Lying Dumbbell External Rotation
Lying on your side and rotating a light dumbbell upward with the elbow pinned to your ribs. A classic rotator-cuff exercise that isolates the external rotators with gravity as the load.
Primary muscles
- Rotator Cuff
Secondary muscles
- Rear Delts
- Sets
- 2–3
- Reps
- 12–20
- Rest
- 30–45s
How to perform
Main muscles working (thicker lines)
Starting position
Lie on your side on a flat bench or the floor, head resting on your lower arm, holding a light dumbbell in the top hand with the elbow bent 90 degrees and tucked against your side, forearm across your stomach.
Keep the upper arm against your side; a rolled towel under the elbow helps.
Rotate the forearm up, lifting the dumbbell in an arc away from your stomach.
Stop when the forearm points toward the ceiling or the elbow starts to move.
Lower slowly to the start, then switch sides.
Breathing: Exhale as you rotate up, inhale as you lower.
Coaching tips
Elbow stays on your ribs
Keep the 90-degree bend
Slow and controlled
Common mistakes
Letting the elbow lift off your side
Rolling back to finish the rep
Using too much weight
Safety notes
Use a very light dumbbell and a pain-free range.
This information is general fitness guidance, not medical advice. Stop if you feel pain and consult a qualified professional.