GD Muscle Pump Auto

The ultimate upper‑body strength trainer.

The GD Muscle Pump is the world's first chest trainer to use gas dampers instead of coil springs. Compared to coil springs, gas dampers offer superior durability, stability, and safety. The resistance of the gas damper increases gradually throughout the range of motion, which means that even if you accidentally let go of the handle, the impact is reduced, lowering the risk of injury.

• The first chest expander to use safe and durable gas dampers.

• Adjustable resistance from 15 to 40 kg, suitable for users of varying strength levels.

• All-metal construction with a high-quality silicone handle, and all components made in Korea.

• An exceptional tool that sparks the desire to exercise every time you see it.

How to remove the hook

1. Grip the handles with both hands and press them firmly. Then remove the shorter part of the hook from the handle. Slowly spread the handles apart and take the hook off.

2. When assembling, place the hook with the longer part onto one handle, press the handles firmly together, and then attach the shorter part of the hook to the other handle.

When is the resistance set to its lowest level ?

When the resistance adjusters are positioned at the top, the resistance is set to its lowest level. As you slide the adjusters downward toward the handles, the resistance increases.
If the adjusters are fully at the top on the first level, the resistance is 15 kg. If the first level feels too difficult to press, you can remove one of the dampers and start with a resistance of 7.5 kg.

Instructions on how to remove one damper can be found in the video below:

How to adjust the resistance

Quickly and easily, as shown in the image below:

1. To increase the resistance, grip the center of the resistance adjuster and pull it down to the desired level.

2. If the adjuster has been moved lower than the desired resistance level, use your finger to slide the metal lever of the resistance adjuster.

3. Move the adjuster to the desired level and close the metal lever. Make sure the adjuster is securely locked into the notch.

The resistance adjusters suddenly shifted to a higher setting during exercise!
Is this a defect?

The answer is NO.

Did the resistance level suddenly change during exercise, as shown in the image above ? 😧

If you exercise too quickly or suddenly release the handle, the resistance adjuster may loosen and drop down abruptly. Due to the gear structure of the Muscle Pump Auto, the adjuster can move downward by design if the damper extends too quickly.

Therefore, perform the exercises slowly, focusing on the squeezing motion and muscle activation. This way, you can train safely while maximizing the effectiveness.

How to exercise with the GD Muscle Pump Auto ?

Muscle Pumping and Chest Expansion
Targeted muscles: deltoids, triceps, and the entire chest area

• Adjust the resistance so that you can comfortably complete 15 to 20 repetitions.

• Hold the Muscle Pump in front of your upper body, with the head of the device positioned slightly below eye level. Squeeze the handles together as you feel tension in your chest, shoulders, and arms.

• Focus on engaging your muscles throughout the entire movement. For maximum effectiveness, perform this exercise at a slow, controlled pace.

• Repeat for 3 to 4 sets of 10 to 20 repetitions, taking breaks between sets.

• For maximum effect, aim to fully close the Muscle Pump with each repetition.

Chest Expansion
Targeted muscles: middle and inner chest muscles

• Hold the Muscle Pump with the handles pointing upward.

• For deeper stimulation, place your thumb over the handle.

• Press with a strong focus on squeezing the inner chest muscles.

• Perform the exercise slowly, keeping the inner chest muscles engaged throughout, and maintain the tension even during the return movement.

• Perform 3 sets of 10 to 20 repetitions, depending on your muscle strength and conditioning, taking breaks between sets.

Shoulder Expansion
Targeted muscles: deltoids, inner chest, upper chest, and latissimus dorsi.

• Hold the Muscle Pump in a standard position and slightly extend your shoulders forward.

• Focus intensely on the deltoid muscles and press them so that you feel engagement in the inner chest.

• Perform the exercise slowly, keeping the deltoid muscles engaged throughout the entire movement.

• Perform 3 sets of 10 to 20 repetitions, depending on your muscle strength and conditioning, taking breaks between sets.

Swayback Exercise (Exercises that help strengthen the back muscles and improve posture)
Targeted muscles: latissimus dorsi and inner chest.

• When engaging the upper back, slightly arch your spine.

• Hold the device parallel to the ground, not vertically.

• By exercising in the Swayback position, you can feel deeper stimulation in the inner chest while also strengthening the upper back muscles.

• Exercise slowly, keeping the muscles engaged throughout, and maintain the tension even during the return movement.

• Perform 3 sets of 10 to 20 repetitions, according to your muscle strength and conditioning, taking breaks between sets.

Shoulder and Spine Pressure
Targeted muscles: upper deltoids, rear deltoids, triceps, and latissimus dorsi.

• This is an exercise where you position the device toward your back. It targets muscles that are not regularly used, so it may feel challenging. Try this movement first with the resistance set to the lowest level.

• Hold the device with both hands and move it backward, slightly tilting your head.

• Press by engaging the latissimus dorsi, upper deltoids, and rear deltoids.

• Exercise slowly, keeping the muscles engaged throughout, and feel the tension even during the return movement.

• Perform 3 sets of 10 to 20 repetitions, depending on your muscle strength and conditioning, taking breaks between sets.