Rear Delts Workout: The Complete Guide

You have been training your upper body every week in the gym. You think you have tried everything, but there is still something missing for the physique you want. The secret could be that you have been neglecting your rear delts. If you’re a gym-goer, bodybuilder, or fitness enthusiast looking for the best rear delts workout, this comprehensive guide is for you. Here, you’ll discover the most effective rear delt exercises, expert tips, and sample routines to help you build strong, defined shoulders and improve your posture.

Rear delt training matters for overall shoulder development and posture because strong rear deltoids are essential for maintaining proper shoulder alignment and posture, counteracting the effects of forward head posture and rounded shoulders, which is common in individuals who spend long hours sitting or using devices. Training the rear delts contributes to overall shoulder stability, which is crucial for effective performance in various upper body movements, including pressing and pulling exercises.

Incorporating rear delt training into your fitness routine helps prevent muscle imbalances in the shoulders, which can lead to injuries and decreased performance in other exercises. In this guide, you’ll learn what the rear delts are, why they matter, and exactly how to train them for optimal results, including isolation and compound exercises, training splits, and actionable tips for your next rear delts workout.

The deltoid muscle is the primary muscle that forms your shoulder and part of your upper back. It consists of three distinct heads:

• Anterior deltoid (front)

• Lateral deltoid (side)

• Posterior deltoid (rear delt)

The posterior deltoid (rear delt) originates at the shoulder blade (scapula) and connects to the top of the humerus (upper arm bone). Although it’s a relatively small muscle, it plays a crucial role in both shoulder function and posture. Strong rear delts help keep the shoulders pulled back, improving posture and promoting better spinal alignment.

• The posterior deltoid originates from the spine of the scapula (shoulder blade) and inserts into the deltoid tuberosity on the humerus (upper arm bone).

• The rear delts are responsible for moving the arm laterally and away from the body (abduction), enabling horizontal abduction (moving the arm backward), assisting in internal rotation of the shoulder, helping lift the elbow to the side, and stabilizing the shoulder joint during pulling movements.

• Rear delts work in conjunction with upper back muscles and other muscles around the shoulder joint to support good posture, prevent shoulder impingement, and contribute to overall shoulder health and stability.

• The rear delts are activated during movements that involve pulling the arms backward, lifting the elbows out to the side, or rotating the shoulders externally.

• Exercises that emphasize horizontal abduction and external rotation are particularly effective for targeting the rear delts.

With a clear understanding of the anatomy and movement patterns, let’s explore the signs of weak rear delts and why it’s important to address them.

• Rounded shoulders and poor posture

• Lack of definition in the upper back

• Instability during pressing or pulling exercises

• Greater risk of shoulder injuries, especially to the rotator cuff

• Imbalances that lead to limited shoulder mobility or discomfort during lifts like rows or presses

• Weak rear delts and upper back muscles can lead to poor posture and rounded shoulders, making it harder to maintain proper alignment.

Understanding these symptoms highlights the importance of targeted rear delt training. Next, let’s discuss how to develop your rear delts for balanced shoulder growth.

The primary way to develop your rear delt is to do more exercises targeting the muscle. To maximize results, aim to train rear delts 2–3 times per week, allowing at least one day of rest between intensive sessions. Muscle activation and building a strong mind-muscle connection are essential for muscle growth in the rear delts, so focus on lighter weights with proper form before progressing to heavier weights. For isolation movements like reverse flies, progressive overload should prioritize adding repetitions or slowing down the eccentric phase rather than simply increasing weight too quickly.

Including both isolation and compound exercises in your rear delt training can enhance muscle development and overall shoulder stability, as compound movements also engage the rear delts as secondary muscles.

Developing your rear delts is a combination of training the shoulders specifically during your training split, using hypertrophy training methods, and using various rear delt-specific shoulder exercises to create a routine that will build a well-defined shoulder.

Now that you know how to approach rear delt development, let’s break down the key benefits of rear delt exercises.

• Improved Shoulder Health: Strong rear delts stabilize the shoulder joint, enhancing shoulder stability and reducing the risk of injury during pressing and overhead movements.

• Better Posture: Rear delt training pulls the shoulders back, counteracting the effects of rounded shoulders and desk slouching.

• More Pulling Power: Rear delts add strength and control to pulling movements like rows, pull-ups, and deadlifts.

• Balanced Shoulder Development: Rear delt work balances out overtrained front delts for a full, 3D look.

• Aesthetic Upper Back: Developed rear delts add width and definition to the upper back, enhancing your physique.

Now that you understand the benefits, let's look at how to structure your training for optimal rear delt development.

Training splits help focus on specific muscle groups for each session, so be sure your training split includes two days of back or shoulder work. For balanced rear delt development, incorporate both compound exercises (which engage the rear delts as secondary muscles) and rear delt isolation movements that specifically target the posterior deltoid. When you work the shoulders more within your training week, you will have more development of the shoulders. 

For isolation exercises, aim for 12–15 reps with lighter weights to maintain strict form, while compound exercises are best performed for 6–10 reps with heavier weights. Keep the training sessions to only two per week, though, because overtraining of the shoulder muscle group can cause just as much harm to the shoulder and rotator cuff as not training the muscles at all. It is a fine line to walk between undertraining and overtraining that takes time to develop.

With your training split in place, let’s discuss the best repetition schemes for muscle growth.

Hypertrophy is the building of muscle to give it more size. There are rep schemes that specifically cause the worked muscles to grow. The commonly used rep scheme is to do 3 or 4 sets of 12 reps to 15 reps. For rear delts, it's recommended to start with lighter weights for higher reps to promote muscle activation, strict form, and better mind-muscle connection, especially when focusing on isolation exercises. To prevent the upper traps from dominating the movement, keep your shoulders depressed and away from your ears during rear delt exercises.

Now, let’s dive into the best rear delt exercises and how to perform them for maximum results.

1. Begin with arms fully extended and back engaged. Think “shoulders down and back.”

2. For bent-over rows or seated rows, pull the weight toward the middle of your chest, keeping elbows flared out at 45–90 degrees from your torso.

3. At the top of the movement, squeeze your shoulder blades together to maximize rear delt activation.

4. For upright rows, pull the weight vertically along the body, stopping near the upper chest. Keep wrists flat and avoid flaring elbows too far.

1. Set the cable or resistance band at chest height.

2. Stand with your feet shoulder width apart for a stable base.

3. Grip the handles with your thumbs pointing over the handles for proper form, arms straight at the start.

4. Pull the rope toward your face, flaring your elbows out so they stay in line with your shoulders.

5. As you pull, squeeze your shoulder blades together at the top of the movement to maximize muscle activation.

6. Slowly lower the weight or band back to the starting position, maintaining control throughout the eccentric phase.

1. it or stand with a slight forward lean, holding dumbbells or using a cable/machine.

2. With a slight bend in your elbows, reach your arms out to the sides in a wide arc, focusing on squeezing your shoulder blades together.

3. Pause at the top, then slowly return to the starting position.

For added variety and to further isolate the rear delts, try the rear deltoids sit variation. Alternatively, chest supported reverse flies on an incline bench are an excellent option to minimize body momentum and maximize rear delt engagement.

1. For pull-ups, use an overhand grip and avoid kipping or swinging. Pull-ups are a body weight exercise, meaning you can perform them with just your body weight for accessibility and convenience. If full pull-ups are too challenging, use resistance bands or an assisted pull-up machine. If you can already do a number of pull-ups, try adding a 10 or 25 lb plate using a weight belt.

2. For lat pulldowns, avoid using momentum. Choose a weight that allows for strict form. Incorporating a close grip lat pulldown can increase activation of the rear delt muscles by changing the pulling angle, making it especially effective for targeting the rear delts.

3. Use different grips (wide, neutral) to shift the emphasis and keep rear delts involved.

Even though the rear delts aren’t the main mover in these exercises, the stabilizing role they play strengthens neuromuscular control and supports shoulder integrity. Over time, this improves mind-muscle connection and leads to better overall development.

1. Start with dumbbells at your sides, palms facing inward.

2. Raise the arms out to the sides, maintaining a slight bend in the elbows and keeping the wrists straight.

3. Don't swing the weights. Use a controlled tempo.

4. Think about lifting with your elbows, not your hands, to engage the rear delts more.

With these exercises in your arsenal, let’s review some essential tips to maximize your rear delt training.

Doing the same shoulder workouts week after week will cause your body to get used to what to expect from a workout. Our bodies respond well to training that offers variety, but this does not require you to develop a new movement or workout routine completely. Adding variety to your workouts can be as simple as using dumbbells instead of a barbell or a machine. For example, incorporating bent over reverse flies and rear delt flies - both excellent for isolating the posterior deltoids - can help target your rear delts more effectively and also engage your core and back muscles.

Band pull-aparts are a convenient rear delt exercise that can be performed anywhere with a resistance band, primarily targeting the rear deltoids and improving scapular stability, making them ideal for posture correction.

Additionally, experimenting with a pronated grip during movements such as suspended inverted rows can increase muscle activation in the rear deltoids. If you notice your progress begins to slow, try adding new movements and equipment, such as a landmine rows.

• Use a pronated (overhand) grip for rows to maximize rear delt activation.

• Keep your shoulders depressed and away from your ears during rear delt exercises to prevent the upper traps from dominating the movement.

• Focus on slow, controlled movements and a strong mind-muscle connection for optimal muscle activation.