Is your shoulder mobility holding back your backswing?
A Physical Therapist's perspective on why a full turn depends on more than your swing thoughts.
Jon Grygalonis, PT, DPT, Cert. DN, C-PS, TPI certified
10/2/20263 min read
Most golfers think of the backswing as a hip and trunk movement. That's a big part of it, but your shoulders have a job to do too.
To get the club to the top of your backswing, both arms need to move through very specific positions. When they can't, your body quietly finds a way to cheat.
What Your Shoulders Need to Do
At the top of your backswing, each arm is doing something different.
Lead arm: horizontal adduction. Your lead arm needs to cross in front of your chest. We look for about 130 degrees of horizontal adduction to get there comfortably.
Trail arm: external rotation. Your trail arm needs to rotate outward as the club goes back and up. We look for 80+ degrees of external rotation so you can reach the top without forcing it.
When both shoulders have what they need, the club gets to the top without a fight. Your arms stay connected and your posture stays put.
Where Thoracic Rotation Fits In
Your shoulders don't work alone. They sit on your upper back, and how well your thoracic spine rotates affects how much shoulder motion you can actually use.
A stiff upper back makes your shoulders work harder to cover the same distance. So sometimes what looks like a "tight shoulder" is partly an upper back that isn't turning the way it should. It's one more reason we look at the whole picture rather than one joint at a time.
What Happens When Shoulder Mobility Falls Short
If your shoulders can't reach the top of the backswing, your body still wants to get the club there. It just finds another route. In our clinic, we commonly see:
The lead arm bends. Without enough horizontal adduction, the lead elbow collapses to keep the club moving back. You lose width and consistency.
The trail elbow flies out. Limited external rotation pushes the trail elbow away from your body, which can throw off your club path on the way down.
You lift out of posture. Your spine angle rises to create the space your shoulders can't, and it's hard to get back to the same spot at impact.
You sway laterally. Instead of turning, your body slides off the ball to make room for the club.
The low back takes over. Just like with restricted hips, your lower back ends up doing rotation it was never built to do.
The result is often inconsistent contact, lost distance, and a body that feels worn down after a round.
A Quick Self-Check: Trail Arm External Rotation
Here's a simple way to get a rough read on your trail shoulder:
Stand with your back, head, and hips against a wall.
Raise your trail arm out to the side at shoulder height, elbow bent to 90 degrees.
Keeping your elbow in place, slowly rotate your forearm backward, moving the back of your hand toward the wall.
Notice how far you get before your lower back arches, your ribs flare, or your shoulder shrugs up.
If your hand stops well short of the wall, or you have to arch or shrug to get there, your shoulder may be limiting your backswing more than your technique is.
What You Can Do About It
Shoulder mobility is trainable, but it's rarely just about stretching the shoulder itself. A well-rounded approach usually includes:
Shoulder mobility work. Targeting both horizontal adduction and external rotation.
Thoracic spine mobility. Helping your upper back rotate so your shoulders don't have to do all the work.
Strengthening through the new range. Mobility you can't control tends to disappear, so we build strength in the positions your swing needs.
Looking at the whole chain. Your shoulders, upper back, and hips all influence each other.
The tricky part is figuring out which of these is limiting you. A shoulder that looks stiff might be fine on its own and held back by the upper back, or the other way around. That's where a hands-on assessment makes all the difference.
The Takeaway
Your backswing is only as good as the range of motion available to build it. If your shoulders can't reach the top without compensating, your swing will find a workaround, and that usually costs you consistency, distance, and eventually comfort.
If you've noticed your lead arm bending, your trail elbow drifting, or that you can't quite get to the top without something else giving way, our team would be happy to take a look. A movement screen with a TPI certified physical therapist can show exactly where your motion is coming up short and what to do about it.
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Richmond, VA 23238
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