REAR DELT MACHINE

The Rear Delt Machine is a targeted exercise for the rear shoulder muscles. The primary focus is on the rear deltoid, which plays an important role in moving the upper arms backward. Depending on the movement pattern, the rhomboids and trapezius assist with shoulder blade movement and stabilization.

In this machine variation, training resistance is transferred through specialized upper-arm pads. The upper arms press against the designated pads and move outward and backward in a controlled manner. This makes the machine different from the conventional reverse pec deck, which uses handgrips.

Depending on the training program, the rear delt machine can be used for muscle growth, controlled strength development, or muscular endurance. The key factors are correct machine adjustment, a stable upper-body position, and controlled movement without excessive momentum.

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VIDEO: REAR DELT MACHINE

This training video is currently in production and will be available soon. Once completed, it will demonstrate the basic movement pattern of a rear delt machine with upper-arm pads.

Pay particular attention to correct seat height, upper-arm pad positioning, a stable upper-body position, and controlled backward movement of the upper arms.

The video will cover:

- correct seat height adjustment
- correct positioning of the upper-arm pads
- stable seated position on the machine
- secure foot positioning on the floor
- natural shoulder and elbow positioning
- correct positioning of the upper arms against the pads
- secure grip if additional handles are provided
- closed grip with thumbs fully wrapped around the handles
- controlled backward movement of the upper arms
- natural shoulder blade movement
- individually adjusted range of motion
- slow return to the starting position
- correct breathing during the exercise
- common technique mistakes and how to avoid them

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MUSCLES WORKED

Primary muscles:

- rear deltoid (Musculus deltoideus, pars spinalis)

Supporting muscles:

- middle trapezius (Musculus trapezius, pars transversa)
- rhomboids (Musculi rhomboidei)
- infraspinatus (Musculus infraspinatus), depending on arm positioning
- teres minor (Musculus teres minor)
- other rotator cuff muscles for shoulder joint stabilization
- lower trapezius to support shoulder blade control
- abdominal and back muscles for upper-body stabilization

The exact muscle involvement depends on factors such as machine design, upper-arm pad positioning, elbow angle, and shoulder blade movement.

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STARTING POSITION

First, adjust the seat height of the rear delt machine. The upper-arm pads should be positioned so that your upper arms rest comfortably and securely against the designated pads.

Sit on the machine according to its design. On machines with a chest pad, position your chest firmly against the designated support. On machines with a backrest or an unsupported seated position, keep your upper body upright and stable.

Place both feet securely on the floor or on the designated footrests. Keep your knees in a natural, comfortable position.

Position your upper arms against the side pads. Your elbows should be bent according to the machine design and positioned approximately at shoulder height or slightly below.

Make sure both upper arms rest evenly against the pads and that you can follow the intended movement path without placing your joints in uncomfortable positions.

If the machine has additional handles, hold them with a secure, closed grip. Wrap your thumbs completely around the handles. Keep your wrists as straight as possible.

Keep your shoulders in a natural position. Avoid deliberately raising them toward your ears in the starting position.

Keep your head aligned with your spine. Your neck should remain as relaxed as possible.

Lightly engage your abdominal and back muscles. Maintain the natural alignment of your spine and avoid excessive lower-back arching.

Your upper arms should initially be in the forward starting position. Choose a training weight that allows controlled backward movement.

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HOW TO PERFORM THE MOVEMENT

1. Move Your Upper Arms Backward Under Control

Press your upper arms against the designated pads in a controlled manner and move the machine arms outward and backward.

The movement is primarily generated by moving the upper arms backward at the shoulder joints. This particularly targets the rear shoulder muscles.

Allow your shoulder blades to move naturally toward each other in a controlled manner.

Keep your elbows in the position intended by the machine. Avoid unnecessary changes in elbow angle during the movement.

Keep your upper body still. On machines with a chest pad, your chest should remain firmly against the support throughout the movement.

Avoid leaning backward using momentum or excessively shrugging your shoulders to overcome the resistance.

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2. Rear Position

Move your upper arms backward until you reach a controlled rear position. Depending on the machine design, your upper arms may be positioned approximately alongside your upper body.

Moving your upper arms excessively far backward is not necessary. The priority is to keep the movement controlled and pain-free.

Maintain tension in the rear shoulder muscles. Allow your shoulder blades to move naturally according to your individual movement pattern.

Keep your spine in its natural alignment and avoid excessively arching your back.

Avoid raising your shoulders excessively toward your ears.

Briefly hold the rear position under control without suddenly forcing the machine arms against a mechanical end stop.

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3. Move Your Upper Arms Forward Under Control

Slowly move your upper arms forward again in a controlled manner.

The rear shoulder muscles resist the return movement as the machine arms move back toward the starting position.

Keep your upper arms securely against the designated pads and avoid suddenly yielding to the training resistance.

Allow your shoulder blades to move apart again in accordance with natural shoulder mechanics.

Keep your upper body still and maintain the natural alignment of your spine.

Do not allow the weight stack to drop or slam down uncontrollably.

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4. Forward Starting Position

Return your upper arms to the starting position in front of your upper body in a controlled manner.

Keep your upper arms against the designated pads. Your shoulders should return to a natural position.

Avoid allowing the machine's resistance to pull your upper arms uncomfortably far forward.

Maintain muscular tension and begin the next repetition without suddenly jerking the machine arms backward.

After the final repetition, return the machine arms under control and allow the weight stack or designated resistance mechanism to settle safely.

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BREATHING DURING THE REAR DELT MACHINE EXERCISE

For general fitness training with controlled movements, the following breathing technique can be used:

When moving your upper arms backward: breathe out.

When returning your upper arms forward: breathe in.

Breathing should remain steady and coordinated with the movement.

Make sure your abdominal and back muscles stabilize your upper body throughout each repetition.

Avoid holding your breath unnecessarily for long periods. This rear delt machine exercise focuses on controlled movement and appropriate training resistance.

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REAR DELT MACHINE FOR MUSCLE GROWTH

When training for muscle growth, the main priorities are targeted loading of the rear deltoid, sufficient training volume, and gradual increases in resistance over time.

As a practical starting point, 10–15 repetitions per set may be used. However, muscle growth is also possible across other repetition ranges, provided the training load is appropriately managed.

Example:

- 3–4 working sets
- approximately 10–15 repetitions
- light to moderate training weight initially
- controlled backward movement of the upper arms
- slow return of the machine arms
- stable upper-body position throughout the set
- adjust the training weight to your ability and technique

The rear delt machine can complement other shoulder and back exercises. The overall training volume for the rear shoulder muscles should be taken into account.

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REAR DELT MACHINE FOR STRENGTH

Strength in the shoulder muscles involved in this machine exercise can also be improved through gradual increases in resistance.

As this is a targeted rear shoulder exercise, controlled strength development and proper movement technique take priority. Very heavy maximal strength attempts are not necessary for this exercise.

Example for experienced lifters:

- approximately 8–12 repetitions
- 2–4 working sets
- sufficiently long rest periods between sets
- controlled strength development without momentum
- stable upper-body position
- as even a load as possible on both shoulders
- only increase the training weight if proper technique can be maintained

Especially as resistance increases, the movement must not be replaced by excessive backward leaning, shoulder shrugging, or jerky pressing against the upper-arm pads.

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REAR DELT MACHINE FOR MUSCULAR ENDURANCE

For local muscular endurance, lighter training weights are combined with higher repetition ranges.

Example:

- approximately 15–20 repetitions
- 2–4 sets
- lighter training weight
- smooth and consistent movement
- controlled backward and forward movement of the upper arms
- shorter rest periods than during strength-focused training

Even with higher repetition ranges, your upper-body position must remain stable.

If fatigue causes a significant loss of movement control or your shoulders no longer follow their natural movement path, end the set.

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IMPORTANT TECHNIQUE TIPS

- Adjust the seat height correctly before training.
- Position your upper arms correctly against the designated pads.
- Keep your feet securely and firmly planted.
- Keep your upper body stable according to the machine design.
- Keep your chest against the pad if one is provided.
- Maintain the natural alignment of your spine.
- Lightly engage your abdominal and back muscles.
- Keep your head and neck in a natural position.
- Keep your shoulders in a natural starting position.
- Use a closed grip if handles are provided.
- Wrap your thumbs completely around the handles.
- Keep your wrists as straight as possible.
- Position your elbows according to the machine design.
- Maintain a consistent elbow angle throughout the set.
- Move your upper arms outward and backward in a controlled manner.
- Allow your shoulder blades to move naturally.
- Avoid excessively shrugging your shoulders toward your ears.
- Avoid excessive compensatory movements with your upper body.
- Only use a range of motion you can control without pain.
- Do not suddenly force the machine against its mechanical end stops.
- Return the machine arms slowly and under control.
- Do not allow the weight stack to slam down uncontrollably.
- Load both shoulders as evenly as possible.
- Choose a training weight that allows you to maintain proper technique.

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COMMON MISTAKES

Using Too Much Weight:
An excessively heavy weight may cause you to move the machine arms backward using momentum and lose control of the movement.

Incorrect Seat Height:
An unsuitable seat height may prevent your upper arms from resting correctly against the designated pads. Adjust the seat height to suit the machine design and your body size.

Incorrect Upper-Arm Pad Position:
If the pads do not suit your natural arm position, the movement may become uncomfortable. Make sure your upper arms are positioned securely and comfortably.

Excessive Shoulder Shrugging:
Excessively raising your shoulders toward your ears can change the movement pattern. Allow your shoulder blades to move naturally without deliberately shrugging your shoulders.

Using Upper-Body Momentum:
If your upper body moves noticeably backward or sideways during every repetition, the exercise becomes increasingly assisted by momentum.

Excessive Range of Motion:
Forcing your upper arms backward beyond your individually controllable range of motion is unnecessary.

Incorrect Grip:
On machines with additional handles, an open grip without the thumbs wrapped around the handles may reduce control. Use a secure, closed grip.

Unstable Wrists:
Excessively bent wrists may make it more difficult to control additional handles safely.

Returning the Machine Arms Too Quickly:
The return movement should remain controlled rather than simply allowing the machine's resistance to pull your upper arms forward.

Allowing the Weight Stack to Slam Down:
If the weight stack lands uncontrollably during every repetition, control of the movement is lost.

Uneven Arm Movement:
If one side moves noticeably faster or farther backward than the other, the load may become asymmetrical. Aim to move both upper arms as evenly as possible.

Insufficient Core Stability:
If your abdominal and back muscles do not provide adequate stabilization, you may lose your upper-body position during the set.

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SAFETY DURING THE REAR DELT MACHINE EXERCISE

Start with a training weight that allows stable and controlled execution. Beginners should first learn how to adjust the machine and perform the basic movement using light resistance.

Before starting, check that the seat, upper-arm pads, and any available safety mechanisms are correctly adjusted.

Make sure your upper arms rest securely against the designated pads and that you can perform the movement without uncomfortable pressure on your shoulder joints.

Not every rear delt machine follows the same movement path. Adjust the seat height, arm position, and range of motion to suit the specific machine and your individual mobility.

If you have existing shoulder or neck problems, qualified instruction may be helpful. Following injuries or surgery, it may be advisable to discuss the training load with a medical professional or physical therapist.

If pain occurs during the exercise, stop the set and have the cause assessed.

Avoid jerky movements and return the machine arms to the starting position under control after training.

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CONCLUSION

The Rear Delt Machine is a targeted exercise for the rear shoulder muscles. The rear deltoid is particularly active during the controlled backward movement of the upper arms.

Unlike the conventional reverse pec deck machine with handgrips, this machine variation transfers training resistance primarily through specialized upper-arm pads. The exact movement pattern depends on the machine design.

By adjusting the training weight, repetitions, sets, and rest periods, the exercise can be adapted for muscle growth, controlled strength development, or muscular endurance.

Regardless of your training goal, correct machine adjustment, a stable upper-body position, and controlled upper-arm movement should always take priority over lifting the heaviest possible weight.