The serratus anterior is one of the most important muscles in shoulder function and one of the least understood outside of physical therapy. When it’s working properly, you never think about it. When it’s not, you get shoulder impingement, scapular winging, and overhead pain that doesn’t respond to typical rotator cuff exercises — because the real problem is upstream.
What Is the Serratus Anterior?
The serratus anterior runs along the lateral ribcage in a series of finger-like attachments from ribs 1 through 8, inserting along the medial border of the scapula. Its primary functions are scapular protraction (drawing the shoulder blade forward around the ribcage) and upward rotation of the scapula during overhead arm movement. Critically, it holds the medial border of the scapula flat against the ribcage — when this function fails, the medial border lifts away, which is called scapular winging.
Why does this matter for shoulder health? Because the scapula is the foundation for every arm movement. During shoulder elevation, the scapula must upwardly rotate in a coordinated pattern with the glenohumeral joint — approximately 2 degrees of glenohumeral motion for every 1 degree of scapular rotation. If the serratus anterior fails to produce adequate upward rotation, the supraspinatus outlet narrows during overhead movement, the rotator cuff is forced to work in a mechanically disadvantaged position, and impingement follows. Serratus anterior weakness is a common upstream cause of rotator cuff tendinopathy and shoulder impingement that gets missed when treatment focuses only on the rotator cuff itself.
Signs Your Serratus Anterior Is Weak
The most visible sign is scapular winging: the medial border of the shoulder blade lifts visibly away from the ribcage, most obviously during a wall push-up or when pressing the arms forward against resistance. Other signs include shoulder pain or impingement during overhead activity, a tendency for the shoulders to “shrug” at the top of a push-up rather than the chest spreading and reaching further forward, and a general pattern of poor scapular control during arm elevation.
Common histories associated with serratus weakness include long thoracic nerve injury (which directly denervates the muscle — this can occur after chest surgery, after carrying a heavy pack on the shoulder for extended periods, or in some contact sports injuries), thoracic outlet syndrome, and the much more common pattern of simply never having trained scapular stability. Overhead athletes, climbers, swimmers, and anyone who does a lot of pressing without proportional stability work often develop this pattern gradually.
Serratus Anterior Exercises: Beginner to Advanced
Beginner and activation exercises teach the serratus to fire in isolation before loading it. The wall push-up with plus is the most commonly prescribed activation exercise: perform a push-up against the wall, and at the top of the movement, push the hands further into the wall to protract the scapulae (spread the shoulder blades apart). You should feel the ribs spread and the front of the shoulder round forward slightly. The serratus punch achieves the same goal lying on your back: holding a light dumbbell with the arm pointing straight at the ceiling, “punch” the weight further toward the ceiling by protracting the scapula — without shrugging the shoulder toward the ear. The bear crawl hold is a deceptively challenging activation exercise: from a quadruped position, lift the knees 1–2 inches off the floor and hold. Maintaining this position requires constant serratus activation to keep the scapulae flat against the ribcage.
Intermediate exercises load the serratus in the push-up pattern and integrate it with arm movement. The push-up with plus progresses the wall version to the floor: at the top of a standard push-up, continue pushing until the scapulae are fully protracted — chest spreading, upper back rounding slightly. The scapular push-up isolates the protraction/retraction component without elbow flexion: in a plank position with arms straight, let the chest sink between the shoulder blades (retraction) and then push the floor away to fully protract. No elbow bending at all — purely scapular movement under load.
Advanced exercises challenge the serratus under dynamic and rotational load. The push-up with rotation reaches full push-up position then rotates one arm toward the ceiling in a side plank — the serratus fires continuously in the stance arm to maintain scapular position while the body rotates. The overhead carry (waiter’s carry) is extraordinarily effective: holding a light kettlebell or dumbbell overhead in a stable position, simply walk. The serratus fires continuously to maintain the scapula in the correct position under load. The cable punch — a serratus pull from a cable at shoulder height, punching forward across the body — provides loaded, concentric protraction through a full range of motion.
Programming and Progressions
During active rehabilitation, serratus anterior exercises can be performed daily at low load — activation work like wall push-ups with plus and serratus punches have minimal recovery demand and benefit from frequent repetition during the re-learning phase. For strength development, three times per week with two to three sets is appropriate. The key integration principle is that serratus exercises work best when combined with lower trapezius and rotator cuff work as part of a comprehensive scapular stability program — the three muscles form a coordinated system, and strengthening them in isolation misses the functional picture.
One important caveat: if there is true long thoracic nerve damage, aggressive loading will not be effective until nerve function returns. Nerve recovery is slow — months to over a year — and the approach during that period focuses on minimizing compensatory movement patterns and maintaining mobility rather than strength training the serratus directly. If you have visible, severe scapular winging with no trauma history and it’s not improving with standard exercise, a PT referral for further neurological workup is warranted.
Address the Foundation, Not Just the Symptoms
Scapular winging, shoulder impingement, or pain with overhead movement often has a scapular stability problem at its root. Highbar’s physical therapists assess shoulder mechanics as a system, not just the site of pain. Book an evaluation and get to the actual source of your shoulder problem.
Dr. Bobby Dattilo PT, DPT, OCS is the Orthopedic Residency Director at Highbar Physical Therapy. His clinical focus includes shoulder and upper extremity rehabilitation, with particular expertise in scapular mechanics and rotator cuff pathology.
