Anatomy Of Shoulder Muscles
The shoulder is a complex joint containing many different muscles working together to provide a wide range of motion. The primary muscles of the shoulder include the deltoids, rotator cuff muscles, and various supporting muscles.
Here’s an overview of these muscle groups:

Anterior Deltoid
Muscles located at the front of your shoulder region

Lateral Deltoid
Muscles located at the side of your shoulder which gives your shoulders a rounded appearance.

Posterior Deltoid
Muscles located at the back of your shoulder. Helps with posture.

Teres Major
Thick muscle at the lower back of your shoulder blade.

Teres Minor
Small muscle at the back of your shoulder blade.

Infraspinatus
Triangular muscle covering the back of your shoulder blade.
Deltoid Muscles
The deltoids are the major muscles of the shoulder and are responsible for the overall shape and appearance of the shoulder. The three parts of the deltoid muscle include the anterior, lateral, and poster deltoid.
Your anterior deltoid is what allows you to flex your arm, whereas your lateral deltoid allows you to lift your arm to the side — also known as abduction. The posterior deltoid helps extend and rotate your arm.
Rotator Cuff Muscles
The rotator cuff is a group of four small muscles that help stabilize the shoulder joint and allow for precise movements. These are the four small muscles: supraspinatus, infraspinatus, teres minor, and subscapularis. To not go too into detail, just think of these as the small muscles that help with the rotation and abduction of your arms.
Trapezius
The trapezius is a large muscle that spans the upper back and neck. This muscle deals primarily with your shoulder blades. When contracted, it allows you to squeeze your shoulder blades together and move them up or down —enhancing shoulder stability.
Rhomboid Muscles
You can find these muscles between your shoulder blades. These muscles help with retracting and shoulder stability.
Latissimus Dorsi
This muscle is commonly referred to as your “lats.” This is a very large muscle group of muscles of the back. These muscles extend from your lower to upper back and help move your shoulder joints.
Pectoralis Major
This large chest muscle contributes to shoulder movement more uniquely. It helps in activities that involve pushing against a force. Try pushing against a wall to feel this muscle contract.
Benefits Of Shoulder Exercises
A common complaint of aging is shoulder pain, specifically difficulties in raising the arm above the head. This can interfere with daily activities like getting dressed or doing household chores.
Research shows performing shoulder exercises is the best way to combat this. A study showed that shoulder exercise participants had decreased pain, improved shoulder movement, and increased shoulder function.
Exercise therapy was shown to be just as effective as receiving steroid injections for shoulder pain. Additionally, complete shoulder training contributes to your general health by keeping you active, which can help improve your overall quality of life.
Tips For Shoulder Training
Training the shoulders effectively requires a balanced approach to target all aspects of this complex joint. As training progresses and fitness improves, you can try heavy weights instead of light ones where weights are used.
Here are some tips for effective shoulder training:
Don’t Skip Warming Up
A proper warm-up can help stretch your muscles before weight lifting. Some examples of shoulder warm-ups include arm circles and shoulder rolls that can help prep your shoulder muscles. Warm-ups get your blood circulating and help prevent injuries from stretching a tight muscle.
Prioritize Form

There’s nothing worse than causing injury through working out. Making sure you have proper form and technique can help decrease your risk of injury and ensure you’re targeting the shoulder muscles effectively.
Controlled Movements & Progressive Overload
Don’t rush through the exercises.
As your strength improves, gradually increase your weight. This increase allows you to keep challenging yourself and decreases the risk of injury.
Include Compound & Isolation Exercises
Combine compound movements like the Overhead Press or Push Press with isolation exercises like Lateral Raises and Front Raises. Doing this ensures that you’re targeting all of the shoulder muscles, not just one area.
Rest & Recovery
Allow time for rest and recovery between shoulder workouts. Training too much can lead to fatigue and increase the risk of injury.
It’s also important to listen to your body for any signs of pain that are beyond typical muscle fatigue while performing shoulder exercises. Don’t ignore this, as it could result in serious injury. If this occurs, avoid the exercise and reach out to a professional.
Conclusion
Your shoulder is a complex joint that contains many different muscles. Training your shoulders requires a comprehensive approach so you can target all of the main muscles and get the most out of your workout. The main muscle groups of the shoulders include the following: deltoid, rotator cuff, trapezus, rhomboid, latissmus dorsi, and pectoralis major; multiple muscle groups are worked in compound shoulder exercises.
All of these muscles work together to provide your shoulder with optimal movement and mobility. Benefits of engaging in shoulder exercises include improved mobility, decreased risk of injury, and decreased pain related to inactivity of the shoulder joint. All of which can contribute to a better quality of life.
It’s important to prioritize rest when training your shoulder muscles and reach out to a professional if you notice intense pain while performing a particular exercise. This can help prevent serious or long-term shoulder injuries. Other things like correct posture and controlled movements can help you get the most out of your shoulder strength training workout.
We shared 12 great shoulder exercises you can implement to stay healthy through physical activity without enduring shoulder injuries. If you’re new to this type of exercise, you can always find a personal trainer to help you with form and technique.
Frequently Asked Questions
A workout that targets all of the main muscle groups of the shoulder is preferred. This will help you get the most out of your workout.
It’s recommended to train the upper body 2-3 times weekly for best results.
There is limited evidence about an exercise that is the best for the entire shoulder. However, one study found overhead presses and lateral raises to be the best options when targeting the deltoid muscles of the shoulder.
While there is limited evidence of muscle growth for the shoulders without weights, bodyweight exercises can help improve overall strength rather than muscle mass.
Resources
Endomondo.com refrains from utilizing tertiary references. We uphold stringent sourcing criteria and depend on peer-reviewed studies and academic research conducted by medical associations and institutions. For more detailed insights, you can explore further by reading our editorial process.
- McCausland, C., Sawyer, E., Eovaldi, B.J. and Varacallo, M. (2020). Anatomy, Shoulder and Upper Limb, Shoulder Muscles. [online] PubMed. Available at: https://www.ncbi.nlm.nih.gov/books/NBK534836/#:~:text=Muscles-.
- Painful Shoulder: Exercise Can Reduce Pain and Improve Mobility and Function. (2020). Journal of Orthopaedic & Sports Physical Therapy, 50(3), pp.142–142. doi:https://doi.org/10.2519/jospt.2020.0501.
- Jung, R., Gehlert, S., Geisler, S., Isenmann, E., Eyre, J. and Zinner, C. (2023). Muscle strength gains per week are higher in the lower-body than the upper-body in resistance training experienced healthy young women—A systematic review with meta-analysis. PLOS ONE, 18(4), p.e0284216. doi:https://doi.org/10.1371/journal.pone.0284216.
- Campos, Y.A.C., Vianna, J.M., Guimarães, M.P., Oliveira, J.L.D., Hernández-Mosqueira, C., da Silva, S.F. and Marchetti, P.H. (2020). Different Shoulder Exercises Affect the Activation of Deltoid Portions in Resistance-Trained Individuals. Journal of Human Kinetics, 75(1), pp.5–14. doi:https://doi.org/10.2478/hukin-2020-0033.
- Lipecki, K. and Rutowicz, B. (2015). The Impact Of Ten Weeks Of Bodyweight Training On The Level Of Physical Fitness And Selected Parameters Of Body Composition In Women Aged 21-23 Years. Polish Journal of Sport and Tourism, 22(2), pp.64–68. doi:https://doi.org/10.1515/pjst-2015-0014.
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