04/06/2026
If you’ve ever struggled to reach behind your head, fasten a bra strap, or put on a jacket, chances are your shoulder mobility needs some attention. One of the most important – and often overlooked – movements for healthy shoulders is external rotation.
What is Shoulder External Rotation?
External rotation is the movement that allows you to turn your arm and hand outwards, away from the body. You use it when you:
Wash or brush your hair
Throw a ball
Put on a coat or rucksack
Without good external rotation, these everyday actions can feel restricted, awkward, or even painful.
Why Do We Lose External Rotation?
Modern life encourages a forward-focused posture – driving, typing, cooking, using a phone – all involve our arms being in front of us. Over time, this can cause:
Tight chest muscles (pectorals) – pulling the shoulders forward
Overworked front-shoulder muscles – from repetitive forward movements
Weakened back-shoulder and upper-back muscles – from lack of use
This imbalance gradually reduces the shoulder’s natural range of motion, making it harder to rotate the arm outward.
You can strengthen your external rotation by firstly stretching your chest muscles, then strengthening your shoulder movement.
Holding a band or some very light weights, position yourself as in the image, keeping your elbows pushed into your ribs, open your arms forearm away from you, then bring them back together. The opening motion will strengthen your movement, so aim to do as many as you can till your muscles fatigue. You shouldn't feel any pain.