Short answer: Yes.
To see for yourself, do this quick test:
Hunch forward, rounding your shoulders forward, and attempt to lift your arms as high as you can. Note how far they go.
Now open your chest, lightly squeeze your shoulder blades together, and again lift your arms as high as you can.
See the difference?
In today’s age of constant screen time, many people have a rather constant rounded-shoulder-posture. From just a quick test, it seems that rounded shoulders can affect shoulder range of motion quite significantly, so let’s go over the details.
This article will cover:
1. What are rounded shoulders
2. What causes rounded shoulders
3. How rounded shoulders decrease your usable range of motion
4. How to fix rounded shoulders
1. What Are Rounded Shoulders:
If you didn’t do the quick test in the beginning, you should do it now. It’s best if you feel and see it for yourself.
First, squeeze your shoulder blades together and try to push them down into your back pockets.
That’s the “proper posture”.
Now relax your shoulders and then lean your head forward like you’re looking at a computer screen.
Take note of how your shoulders look now, they should be rounded forward. That’s the posture many people sustain for hours a day.
Though no specific posture is inherently good or bad in itself, there can be pitfalls depending on your goals.
2. What Causes Rounded Shoulders
Besides being genetically born with thoracic kyphosis or another pathology that you can’t change, here are three modifiable factors that contribute to rounded shoulders.
Modifiable Factor 1: Posture and Neurodynamic Control
Though many people typically round their shoulders much of the day, they aren’t automatically destined to have forever rounded shoulders.
In fact, most people can still assume a neutral shoulder position and have good potential for full shoulder motion.
That being said, the more your practice something, the better you get at it, and vice versa. For this reason, the more time spent in a rounded shoulder posture, the more natural it becomes. The less time spent with shoulders back and torso erect, the less natural it becomes.
Over time, the ability to squeeze the shoulder blades together and keep an erect torso become much harder as your muscles don’t know how to do it as they rarely practice it.
This creates a sort of feedback loop in the brain. Rounded shoulders starts to become your new normal such that you may feel straight and upright even when you are not.
Modifiable Factor 2: Limited Pectoral Flexibility and/or Pectoral Dominance
Your pectorals (major and minor) run from the front of your scapula, clavicle, and sternum to the front of your humerus. If they shorten, they tend to draw your shoulders forward.
To visualize this, take one hand and put the thumb on your opposite clavicle and the middle finger on your bicep. That’s the direction the pectorals run.
Now, keeping your two fingers glued to your body, move your thumb towards your bicep. This simulates the shortening/contracting of your pecs.
What happens to your shoulders? They round forward.
It’s easy to see that if your pecs were perpetually shortened, your shoulders would be perpetually rounded.
How do pectorals become tight to begin with? There are two main reasons.
First is via sustained posture, as mentioned above. Sitting with rounded shoulders all day keeps the pecs shortened, all day. If they aren’t stretched out regularly, they become stiff and short.
Second is via pectoral dominance. If all you do for upper body workouts are horizontal pushing movements (push ups and bench presses) while neglecting pulling exercises to work your back (rows and pull ups) your pecs become dominant over your back.
Like a tug of war, the pecs win, pulling your shoulders forward, yet again.
Modifiable Factor 3: Limited Thoracic Mobility
This factor is quite direct in causing rounded shoulders.
The thoracic spine is essentially the spine of the upper back. Generally, stiffening of the thoracic spine is associated with kyphosis, which is the accentuated rounding forward of the spine.
It’s no surprise that when the upper back rounds forward, the shoulders follow.
How does the thoracic mobility decline? Most often it’s due to disuse and not enough movement through the area.
How often do you work twisting motions of the upper body? How often do you work extension motions of the upper body? Even if we throw out the word “work”, how often do you ever twist or extend your upper back. Usually, not very often.
As those positions aren’t used and the body remains stagnant, the thoracic spine stiffens and accentuates its already forward curve.
The shoulders then follow.
3. How rounded shoulders decrease your usable range of motion
Straight to the point:
Rounded shoulders, over time, cause detrimental scapular kinematics that reduce your range of motion and even cause shoulder pain.
Scapular movement is essential to full shoulder range of motion. With a stationary scapula, the humerus can move only 120 degrees into flexion, like when you reach for something on top of your sedan.
The additional shoulder range of motion comes from the upward rotation of your scapula. As it upwardly rotates, the acromion moves out of the way, allowing further humeral movement.
Without the scapula’s upward rotation, the acromion would block the humerus from moving, reducing shoulder range of motion and causing pain if you tried to force through it.
What does this have to do with rounded shoulders?
A study by Kebaetse M, McClure P, and Pratt NE looked at the effect of rounded shoulders on shoulder range of motion and strength. They found that a slouched postures (rounded shoulders) significantly decreased shoulder range of motion and strength at 90 degrees.
Essentially, when you round your shoulders forward, you alter your scapular kinematics and prevent the scapula from upwardly rotating, effectively blocking your humerus from moving further.
4. How to fix rounded shoulders
How to fix rounded shoulders depends on what’s causing them.
Can you get out of the rounded shoulder position by squeezing your shoulder blades together? If you can’t even get out of the hunched position, you need to see a medical professional.
If you can get out of the rounded position, does it feel natural or unnatural?
If natural, then just spend some time throughout the day occasionally trying to squeeze your shoulder blades together. If unnatural, need to determine why.
If you are spending ALL day in that hunched position, you need to try and spend more time OUT of that position as well as perform some corrective exercises.
Good exercises include lying on your back on a foam roller for 5-10 minutes (foam roller running along your spine), shoulder squeezes, rows, pull ups, supine pull overs with a light dowel, y’s, and t’s.
These exercises are also great to do if you have tight or dominant pectorals. However, in that case, you also need to stretch your pecs daily.
To have the biggest effect, you should do you pec stretches BEFORE the back exercises. This allows you gain a new range of motion via the stretches and then repetitively push/practice that range via the active exercises. If you performed your exercises before the stretches, you would be pushing/practicing through a smaller range.
To increase thoracic mobility, your best bet is to start with some exercises like open books, kneeling open books, quadruped thoracic rotation, lumbar locked thoracic rotation, and seated thoracic rotation and side bend. Pick one or two that you like and stick with them on a rather daily basis.
That about covers it.
We hope you had a great read and can apply some of this knowledge to the real world for real results.
If you have any questions, feel free to contact us.
As always, stay functional, stay fit, and bulletproof your body.
Best,
Renegade Rehab


