Dumbbell Lying Shoulder External Rotation
The Dumbbell Lying Shoulder External Rotation primarily works the Infraspinatus, with secondary activation of the Posterior Deltoid, Teres Minor and stabilizer support from the Rhomboids, Trapezius (Lower), Wrist Extensors. It is a dumbbell isolation exercise at intermediate difficulty.
The Dumbbell Lying Shoulder External Rotation is an intermediate isolation exercise performed with dumbbell, following a isolation movement pattern. It primarily targets the Infraspinatus, with secondary engagement of the Posterior Deltoid, Teres Minor. This is a bilateral pulling movement, engaging both sides of the body simultaneously.
A dumbbell isolation pull exercise targeting the Infraspinatus.
| Equipment | Dumbbell |
|---|---|
| Difficulty | Intermediate |
| Type | Isolation |
| Movement | Isolation |
| Force | Pull |
| Laterality | Bilateral |
| Primary | Infraspinatus |
| Secondary | Posterior Deltoid, Teres Minor |
Muscles Worked
The Infraspinatus is the primary mover, taking on the bulk of the workload throughout the full range of motion. The Posterior Deltoid, and Teres Minor act as secondary movers, assisting the primary muscles and contributing meaningfully to the overall output. The Rhomboids, Trapezius (Lower), Wrist Extensors act as stabilizers, maintaining joint position and postural alignment throughout the movement.
Primary Muscles
- Primary Muscle Infraspinatus (back)
Secondary Muscles
- Secondary Muscle Posterior Deltoid (shoulders)
- Secondary Muscle Teres Minor (back)
Stabilizer Muscles
- Stabilizer Muscle Rhomboids (back)
- Stabilizer Muscle Trapezius (Lower) (back)
- Stabilizer Muscle Wrist Extensors (forearms)
How to Perform
Preparation
- Lie on side with legs separated for support.
- Grasp dumbbell and position elbow against side and forearm across belly.
Execution
- Lift dumbbell by rotating shoulder.
- Return and repeat.
- Flip over and continue with opposite arm.
Comments
- Maintain elbow against side and fixed elbow position (90° angle) throughout exercise.
- Placing towel roll under arm increase infraspinatus and teres minor EMG signal activity compared to no towel roll (Wilk KE 2002), although subsequent study found no significant difference (Reinold MM 2004).
- Also seeDumbbell Shoulder External Rotation Errors.
Tips & Common Mistakes
- Use a full range of motion — partial reps reduce stimulus on the target muscle.
- Slow down the eccentric (lowering) phase for greater time under tension.
- If you need to swing or cheat, the weight is too heavy — reduce and focus on form.
Programming Suggestions
Adapt your sets and reps to your training goal.
| Strength | 3–4 sets × 6–8 reps at 75–85% 1RM with 90–120 seconds rest. |
|---|---|
| Hypertrophy | 3–4 sets × 10–15 reps at 60–75% 1RM with 60–90 seconds rest. |
| Endurance | 2–3 sets × 15–25 reps at 40–60% 1RM with 30–45 seconds rest. |
Alternative Exercises
These exercises target the same primary muscles (Infraspinatus) and can be substituted based on your equipment or variation preferences.
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