Rear Delts: The 7 Best Exercises and How to Train Them Correctly

When you picture strong, well-developed shoulders, you probably think of the impressive cap that sits on top of the arm. However, many people unknowingly neglect the key to achieving truly balanced and powerful shoulders: the rear delts.

These small but mighty muscles on the back of your shoulders are crucial not just for aesthetics, but for posture, strength, and injury prevention. Focusing on your rear delts can transform your physique and enhance your overall upper body function.

Often overshadowed by pressing movements that target the front and side of the shoulders, the posterior deltoids require specific attention. Without dedicated work, this imbalance can lead to rounded shoulders and potential joint issues. Therefore, learning how to effectively train this area is a game-changer for anyone serious about their fitness journey.

This guide will break down everything you need to know. We will explore the anatomy of the rear delts, their functional benefits, and provide a list of the most effective rear delt exercises to build strength and definition. Get ready to master this essential muscle group and unlock a new level of shoulder development.

What are rear delts exactly?

So, what are rear delts? The term is short for posterior deltoids. Your deltoid is the large, triangular-shaped muscle that forms the rounded contour of your shoulder. It is comprised of three distinct sets of muscle fibers, often called “heads,” each with a different function. Think of it as a three-part team responsible for your arm’s incredible range of motion.

The three heads of the deltoid are:

• Anterior Deltoid (Front Delt): Located at the front of your shoulder, this head is primarily responsible for shoulder flexion, which is lifting your arm forward. It gets heavily involved in exercises like push-ups and the bench press.
• Lateral Deltoid (Side Delt): This is the middle head, and its main job is shoulder abduction—lifting your arm out to the side. Exercises like lateral raises specifically target this part to create shoulder width.
• Posterior Deltoid (Rear Delt): Found on the back of your shoulder, this head is responsible for shoulder horizontal abduction (pulling your arm straight back) and external rotation. It is the focus of this article.

Understanding this anatomy is the first step toward building balanced shoulders. While many common exercises heavily recruit the front and side delts, the rear delts often receive minimal stimulation, leading to muscular imbalances.

The function of your posterior deltoids

The primary role of the rear delts is to pull your upper arm backward, away from the front of your body. This movement, known as transverse abduction or horizontal extension, is fundamental to countless daily activities. Think about reaching back to grab your seatbelt, pulling open a heavy door, or starting a lawnmower. Your rear delts are the prime movers in these actions.

Furthermore, they are crucial synergists, or helpers, in almost all pulling movements. When you perform rows for your back or pull-ups, your posterior deltoids are firing to assist the larger back muscles and stabilize the shoulder joint. This stabilizing role is perhaps their most underappreciated function. A strong set of rear delts creates a solid foundation for all pressing movements.

The problem is that modern lifestyles and typical gym routines often create a significant imbalance. We spend hours hunched over desks and phones, which shortens chest muscles and lengthens back muscles. Then, in the gym, many people prioritize pressing exercises like the shoulder press machine and bench press, further strengthening the front delts. This combination can lead to poor posture and an increased risk of injury. Actively working to improve your posture and movement quality starts with addressing these imbalances.

The 7 best rear delt exercises for mass and definition

To effectively target your rear delts, you need to choose exercises that isolate them with proper form. Because they are a smaller muscle group, the focus should always be on control and feeling the muscle work, not on lifting the heaviest weight possible. A strong mind-muscle connection is crucial for making progress.

Here are seven of the best exercises to incorporate into your rear delt workout:

1. Face Pull

This is arguably the king of rear delt and upper back exercises. Using a rope attachment on a cable machine set at chest height, pull the ropes toward your face while simultaneously pulling them apart. Focus on externally rotating your shoulders at the peak of the movement. It’s fantastic for both muscle growth and shoulder health.

2. Bent-Over Dumbbell Reverse Fly

A timeless classic for a reason. Hinge at your hips with a flat back, holding a pair of dumbbells with your palms facing each other. With a slight bend in your elbows, raise the weights out to your sides, squeezing your shoulder blades together. Imagine you are trying to stretch a wide band across your back.

3. Wide-Grip Seated Row

While typically a back exercise, a small tweak in form can shift the emphasis to your rear delts. Use a long bar on a seated row machine and take a wide, overhand grip. Instead of pulling low toward your stomach, pull the bar toward your upper chest or collarbone, keeping your elbows flared out.

4. Reverse Pec-Deck Machine

This is one of the best isolation movements because it provides stability and removes the need to balance your torso. Sit facing the machine and set the handles back. With your arms extended, push the handles backward in a wide arc, focusing entirely on contracting your posterior deltoids. This is a great exercise to use the `rear delt machine`.

5. Barbell High Row

This is a powerful compound movement that hits the rear delts, traps, and rhomboids. Grab a barbell with a wider-than-shoulder-width grip. Hinge forward slightly and pull the bar up toward your upper chest, driving your elbows up and out. Keep the movement controlled to avoid using momentum.

6. Single-Arm Cable Reverse Fly

Performing the reverse fly one arm at a time on a cable machine allows for a greater range of motion and helps correct any strength imbalances between your left and right side. This promotes better symmetry and stability.

7. Band Pull-Apart

Don’t underestimate the power of resistance bands. Hold a band with an overhand grip at shoulder width. With your arms straight out in front of you, pull the band apart by squeezing your shoulder blades together until it touches your chest. This is perfect for warm-ups, finishers, or high-rep sets to really burn out the muscle.

You don’t need to do all seven in one session. Rotating two or three of these across your weekly split, alongside the reference guide on building strong rear delts, is enough to keep the muscle progressing without overloading the shoulder joint.

Why you should train rear delts: more than just aesthetics

Incorporating dedicated rear delt exercises into your routine offers benefits that extend far beyond creating a 3D look. While they certainly contribute to a more complete and symmetrical physique, their functional importance cannot be overstated. Prioritizing this muscle group will lead to significant improvements in your overall fitness.

Here are the key benefits of a dedicated rear delt workout:

• Improved shoulder health and stability: Balanced strength across all three deltoid heads is essential for maintaining the health of the shoulder joint, which is the most mobile and inherently unstable joint in the body. Strong rear delts help keep the head of the humerus (upper arm bone) centered in the socket, reducing the risk of impingement and rotator cuff injuries. Foundational research, like a study in the Journal of Human Kinetics, highlights the importance of muscular balance for joint health.
• Enhanced posture: In a world where we constantly slouch forward, strong rear delts act as a powerful counterbalance. They pull the shoulders back and down, helping to correct the rounded, forward-slumped posture that many people develop from prolonged sitting. This not only looks better but also reduces strain on your neck and upper back.
• Increased pushing strength: This might seem counterintuitive, but a stronger back supports a stronger front. When you perform heavy pressing movements like the bench press, your rear delts act as stabilizers. A more stable shoulder allows you to generate more force safely, leading to heavier lifts and greater muscle hypertrophy in your chest and triceps.
• A complete, well-rounded physique: From an aesthetic standpoint, well-developed rear delts are non-negotiable. They add depth and thickness to your upper body, making your shoulders look impressive from the side and back, not just the front. This creates a powerful V-taper and a more balanced and athletic appearance.

None of these benefits require heavy loading. The rear delts respond well to lighter weights and higher reps, so the payoff comes from consistency and technique rather than how much you can lift.

Structuring your rear delt workout

Now that you know the best exercises, it’s time to put them into a plan. Because the rear delts are involved in back training, they fit perfectly into a back day or a dedicated shoulder day within your workout split. You can also add one or two of these movements at the end of a push day to ensure they get enough work.

The key is to prioritize them. If your rear delts are a weak point, perform your rear delt exercises at the beginning of your shoulder workout or right after your main compound lifts on back day. This ensures you can hit them with maximum energy and focus.

Here is a sample rear delt workout focused on hypertrophy. This can be added to your existing routine 1-2 times per week.

Exercise	Sets	Reps	Rest
Face Pull	3	15-20	60 seconds
Bent-Over Dumbbell Reverse Fly	3	12-15	60-90 seconds
Reverse Pec-Deck Machine	3	12-15 (with a final drop set)	60 seconds

Remember to focus on quality over quantity. The total number of sets you need depends on your overall training program, but a good starting point is 6-10 direct sets per week, adjusted based on how your rear delts respond and how the rest of your training is structured.

Common mistakes when you train rear delts

The posterior deltoids can be tricky to isolate, and several common errors can prevent you from getting the results you want. Avoiding these pitfalls is crucial for effective training and injury prevention. Here are the most frequent mistakes to watch out for.

• Using too much weight: This is the number one mistake. The rear delts are small muscles, and if the weight is too heavy, larger muscles like the traps, rhomboids, and lats will take over the movement. Drop the ego, lighten the load, and focus on a strong, controlled contraction.
• Swinging with momentum: Using momentum to heave weights up not only reduces the tension on the target muscle but also increases the risk of injury. Each rep should be deliberate. Pause for a second at the peak contraction to ensure your rear delts are doing the work.
• Incorrect range of motion: Some people cut the range of motion short, failing to fully contract the muscle. Others go too far, retracting the shoulder blades excessively and turning the exercise into a back movement. Focus on moving the arm in its socket, not just squeezing your shoulder blades together.
• Neglecting them entirely: The most significant error is simply not training them at all or assuming they get enough work from other exercises. To overcome an imbalance, you must give your rear delts direct, focused attention. Don’t fall into one of the most common training mistakes that kill progress.

Most of these mistakes trace back to the same root cause: treating the rear delts like a large muscle group that can handle heavy loading. Lightening the weight almost always fixes several of these issues at once.

Building a stronger, more balanced upper body with rear delts

Building strong, defined rear delts is one of the most impactful things you can do for your physique and functional health. It’s the secret to creating truly three-dimensional shoulders, improving your posture, and building a more resilient and injury-proof upper body. By moving beyond a press-heavy routine and giving your posterior deltoids the attention they deserve, you unlock a new level of strength and balance.

Start by incorporating two or three of the exercises from this guide into your weekly split. Focus on impeccable form, control, and establishing a solid mind-muscle connection. The weight on the bar or dumbbell is far less important than the quality of each contraction. Be patient and consistent, and you will see and feel the difference.

Ready to build a truly balanced and powerful upper body? Track your rear delt workout and monitor your progress with the BeFit app. For more expert-led training guides and fitness tips, explore our blog and check out our list of the best workout apps to help you on your journey!