Tennis& Posture
One-sided shoulder imbalance, thoracic rotation, cervical strain
Updated May 2025
What Tennis Does to Your Body
Tennis is one of the most demanding one-sided sports on the human body. The dominant arm is significantly more developed, the thoracic spine rotates in one direction thousands of times, and the serve places extreme load on the cervical spine and shoulder in a single direction. Without corrective work, these imbalances compound over a career.
The Specific Structural Changes
Dominant arm develops at the expense of the non-dominant side
Years of forehand groundstrokes, serves, and volleys build the dominant shoulder, arm, and thoracic rotator in one direction. The non-dominant side is comparatively undertrained. The visible result is shoulder height asymmetry, the dominant shoulder is typically lower and more internally rotated.
Thoracic rotation is biased in one direction
Every forehand and serve rotates the thoracic spine in the same direction. The return of serve rotates it the same way. Over thousands of games, the thoracic spine becomes significantly more mobile in the dominant rotation direction and restricted in the other.
The serve loads the cervical spine explosively
The tennis serve involves looking up and then explosively rotating the head and cervical spine as the ball is struck. At professional pace, this happens at high velocity. For recreational players who serve with poor mechanics, the cervical load can be significant.
Common Injuries in Tennis
These aren't random injuries. They're the predictable result of the structural patterns tennis creates.
- Tennis elbow (lateral epicondylitis)
- Rotator cuff tears and impingement
- Cervical disc compression
- Lower back pain from rotation imbalance
- Patellar tendinitis from split-step landing
Why posture matters for performance
Bilateral thoracic rotation means a more consistent swing path in both directions. Shoulder symmetry means lower injury risk and better serve mechanics. Cervical health determines how long you play. The structural investments you make off the court determine what you can do on it.
The Tennis Program
The Tennis Player's Posture Fix restores bilateral thoracic rotation, addresses throwing-shoulder asymmetry, decompresses the cervical spine, and builds the hip stability that explosive court movement demands.
What Tennis Athletes Actually Deal With
These are the injuries and pain patterns that come up in every tennisforum, group ride conversation, and training camp. Here's how each one connects back to structural alignment, and what you can do about it.
Tennis elbow (lateral epicondylitis)
Tennis elbow is the most common overuse injury in recreational tennis, despite being rarer in professionals. The lateral epicondyle, the bony bump on the outside of the elbow, becomes inflamed from repetitive wrist extension and forearm supination, primarily from backhand stroke mechanics. It's also common in players who grip the racket too tightly.
Posture connection: Tennis elbow is strongly influenced by shoulder and thoracic alignment. When the shoulder is internally rotated from rounded thoracic posture, the forearm mechanics through the backhand change, placing more stress on the lateral elbow structures. Thoracic extension and posterior shoulder work changes the mechanics that allow lateral elbow overload.
Service-related lower back injury
The tennis serve requires maximal lumbar extension, thoracic rotation, and explosive trunk flexion through impact, all in one movement. For players with limited thoracic mobility, the lumbar spine compensates for the missing range, creating enormous facet and disc stress on every serve. High-volume servers without thoracic mobility are almost guaranteed to have lower back issues.
Posture connection: Service-related back pain is almost always a thoracic rotation and extension problem. When the thoracic spine can't rotate and extend through the service motion, the lumbar spine compensates, taking the rotation load it was never designed to handle. Thoracic mobility work specifically for the service motion is the structural fix.
"Tennis shoulder", rotator cuff from overhead play
The overhead serve and smash repeatedly load the rotator cuff in a position of maximum internal rotation and horizontal abduction. Combined with the paddling/follow-through motion, the anterior shoulder structures are chronically overworked and the posterior shoulder progressively weakened. Tennis shoulder is the analog to swimmer's shoulder, same mechanism, different sport.
Posture connection: Rotator cuff health in overhead sports depends heavily on scapular position, which depends on thoracic alignment. A rounded thoracic spine tips the scapula forward, compressing the subacromial space on every overhead. Thoracic extension and posterior chain work is the foundation of shoulder injury prevention in tennis players.
Questions from the Tennis Community
Why do I get tennis elbow when I have good technique?
Good technique reduces but doesn't eliminate the forearm stress of the backhand, and if your shoulder alignment is compromised by thoracic rounding, good technique on the racket side doesn't prevent the proximal mechanics from placing excess stress on the lateral elbow. Shoulder and thoracic alignment work changes the mechanical environment the elbow operates in.
My lower back hurts after match play but not practice. Why?
Match play involves more serves at higher intensity and more movement patterns over longer duration than most practice sessions. The cumulative disc and facet load from serving without full thoracic rotation is what produces the pain, and it compounds over a match in a way that practice drills don't replicate.
Frequently Asked Questions
I have tennis elbow. Will this help?
Tennis elbow often has a thoracic component, rotation restriction that forces the arm to compensate. The thoracic and shoulder work can reduce the load that reaches the elbow.
How long until my non-dominant rotation improves?
Most players notice improvement in the non-dominant rotation direction within 3–4 weeks of consistent daily work.
Written by Mike Boshnack
Certified Egoscue Therapist · Posture Guy Mike
Mike Boshnack grew up skateboarding and surfing, trained MMA, and rode road bikes competitively, before a shoulder injury put him on a path to discover the Egoscue Method. He's since helped thousands of athletes fix the specific postural patterns their sport creates, without surgery or passive treatments.
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