JM Press: Hybrid Power for Extreme Triceps Mass

1. Introduction and Relevance

In the world of strength training, exercises sometimes appear that combine the best of two worlds. The **JM Press** is precisely such a hybrid, merging the biomechanics of the close-grip bench press and the French press (skull crusher). This is an exercise that was created to overcome bench press plateaus but became legendary for its ability to build incredible triceps mass and density. It allows for work with weights that are inaccessible for ordinary isolation while providing a level of tension that literally forces the muscles to grow.

The relevance of the JM Press in modern training is driven by its unique impact on the elbow extensor and the lateral head of the triceps. For many athletes, ordinary cable extensions become insufficient for further progress. The JM Press offers a challenge that requires perfect coordination and steel elbows. This is an exercise for those who want not just voluminous but functionally strong arms capable of withstanding massive loads in all pressing movements. Furthermore, it is one of the best ways to strengthen triceps tendons when approached correctly.

In this article, we will break down the biomechanical secrets of this hybrid movement, learn how to build the ideal trajectory for elbow protection, and discover how to structure the training process so your triceps become your primary strength advantage.

2. History and Evolution

The exercise is named after JM Blakley, a legendary powerlifter and bench press record holder. Blakley was looking for a way to strengthen his triceps so it would directly impact his bench press, but without overloading his shoulders as much as a heavy close-grip press does. Through experimentation, he found an angle where the bar descends not to the chest, but to the upper neck or chin, which maximally isolates the triceps in a pressing movement.

The evolution of the exercise in the 90s made it the "secret weapon" of the Westside Barbell gym under the leadership of Louie Simmons. It was there that the JM Press became the foundation for preparing the world's strongest bench pressers. Athletes noticed that after including this exercise, their bench press results grew by 10-15% within a few months. Over time, the exercise moved from powerlifting to bodybuilding, as its ability to build muscle mass in the elbow area proved unsurpassed.

Today, the JM Press is viewed as an elite triceps exercise. Modern sports science has confirmed that the hybrid nature of the movement allows for engaging the largest number of triceps muscle fibers simultaneously. The exercise has traveled the path from an author's experiment to the gold standard of arm strength training worldwide.

3. Anatomy and Biomechanics of the Hybrid Press

The JM Press focuses the load on the entire triceps array, with a specific emphasis on the zones responsible for the final lockout.

Lateral Head of the Triceps

Receives a colossal load due to the specific elbow flexion angle. It is this head that gives the arm width and density.

Medial Head of the Triceps

Works as the primary elbow stabilizer, ensuring a powerful push of the weight from the chin upward.

Long Head of the Triceps

Engaged less than in a French press, but still works in the eccentric phase, holding the weight under control.

Anconeus Muscle (m. anconeus)

In this exercise, it works at the edge of its capabilities, which is critical for the health and stability of the elbow joint.

Front Delts and Upper Chest

Work only as supporting stabilizers. Correct JM Press technique minimizes their role, transferring 90% of the load to the triceps.

Biomechanical Mechanics: Biomechanically, the JM Press is a movement where the elbows go forward and down, and the bar descends to the chin or throat. This creates a much sharper angle in the elbow than in a regular press, increasing the moment arm for the triceps. The key point is the immobility of the shoulder joint in the vertical plane; movement occurs primarily through elbow flexion, but with a pressing component.

4. Biochemical Impact: Mechanical Tension and Fiber Density

The JM Press creates one of the highest levels of mechanical tension, which is the primary driver of myofibrillar hypertrophy.

Biochemically, working with heavy weights in this hybrid mode leads to intense breakdown of protein structures in the triceps. These micro-tears trigger a cascade of mTOR signals, leading to thickening of muscle fibers and increased density. Unlike pumping exercises, the JM Press builds "hard" muscle mass that does not disappear after the workout. Furthermore, the exercise stimulates collagen synthesis in the triceps tendons, adapting them to heavy loads.

The JM Press is the exercise that turns your triceps into stone. It is the combination of a powerlifter's strength and a bodybuilder's aesthetics.

It is also important to mention the impact on the nervous system. The need to control a heavy barbell near the face requires extreme concentration and a high level of neural drive. This improves the CNS's ability to recruit high-threshold motor units, making you stronger in any other press.

5. Practical Methodology and Execution Technique

The technique for the JM Press does not forgive mistakes. The slightest shift in trajectory can turn the exercise into a dangerous French press or a regular close-grip bench press.

• Starting Position: Lie on a bench press. Take the bar with a narrow grip (about 30-40 cm). Straighten your arms over your chest.
• Start of Movement: On an inhale, begin lowering the bar, bringing the elbows forward toward your feet. The bar should move toward your chin or upper neck.
• Elbow Angle: At the bottom point, the forearms should almost touch the biceps. Your elbows should be pointed forward, not to the sides.
• The Press: On an exhale, with a powerful movement, press the bar up along the same trajectory. Imagine you are simultaneously pushing and extending your arms.
• Lockout: At the top point, fully straighten your arms, but do not "click" the elbows.

6. Load Progression and Integration

Progression in the JM Press should be strength-oriented but with perfect technique.

• Increasing Weight: Add 1-2 kg to the bar only when all repetitions in the set have been performed without body help and with an ideal pause at the bottom.
• Work with a Pause: Hold the bar near the chin for 2 seconds. This will remove inertia and force the triceps to work from a dead stop.
• Using Chains or Bands: Adding chains increases the load in the upper lockout phase, which is the specificity of the JM Press.
• Integration: Place the JM Press as the first or second exercise on triceps day. It requires a lot of energy and a fresh CNS.

Important: The JM Press pairs perfectly with subsequent cable extensions to fully exhaust triceps resources. Never do this exercise with a weight you cannot controlfully lower to your face.

Do not fear heavy weights, but respect them. The JM Press is an exercise for masters, not for ego lifters.

7. Analysis of Scientific Research and Evidence Base

EMG studies confirm that the JM Press provides triceps activation at a level of 90-95% of maximum, which is one of the highest among all upper body exercises. The hybrid nature of the movement allows for engaging both the pressing and extending functions of the muscle.

Scientific works on elbow joint health indicate that the JM Press, despite its heaviness, may be safer than the French press for people with elbow pain, as the pressing component allows part of the load to be distributed to the shoulder girdle. However, this only works provided the elbows are correctly brought forward.

Scientists also investigated the role of the grip. It was established that using a medium grip (slightly narrower than shoulders) allows for a significant increase in working weight without losing triceps activation, making this option optimal for mass growth.

8. Synergy: Nutrition, Nutraceuticals, and Recovery

To maintain high intensity and strengthen tendons, quality nutrient support is needed.

Creatine Monohydrate

Provides strength for heavy sets and promotes water retention in the triceps, protecting joints from within.

Collagen + Vitamin C

Necessary for adapting elbow tendons to the massive loads of the JM Press.

Glucosamine + Chondroitin

Support joint cartilage health during intense friction during elbow flexion under heavy weight.

Citrulline Malate

Improves triceps capillarization, ensuring nutrient delivery for regeneration after micro-traumas.

Recovery after the JM Press should include active triceps stretching and using a massage ball to work the lateral head. Quality sleep is mandatory, as the CNS after this exercise requires a minimum of 48 hours for full recovery.

9. Common Mistakes, Myths, and Injury Prevention

The main mistake is flaring the elbows out (as in a regular press). This transfers the load to the chest and shoulders, making the exercise ineffective and dangerous. KEEP ELBOWS POINTED FORWARD!

• Myth: The JM Press kills the elbows. (Reality: Incorrect technique kills. Correct execution, conversely, strengthens the joint apparatus).
• Mistake: Lowering the bar behind the head (turning it into a French press). This creates too long a lever for the elbow at such a heavy weight.
• Myth: You can do the JM Press with dumbbells. (Reality: It is possible, but a barbell allows for better trajectory control and work with heavier weight).
• Mistake: Lifting the pelvis off the bench when lifting the weight.

To prevent injury, always start with a thorough triceps warm-up on a cable. If you feel the slightest sharp pain in your elbow—immediately reduce the weight or stop execution.

10. FAQ: Answers to Common Questions

Why is the JM Press better than the close-grip bench press?

It isolates the triceps more due to the sharper elbow angle and trajectory toward the chin, turning off the chest.

What is the optimal grip width for the JM Press?

Usually 30-40 cm. Too narrow a grip can overload the wrists.

Can beginners do this exercise?

No, the JM Press requires good control and already strengthened ligaments. Start it after at least a year of regular training.

How often should I train triceps with this exercise?

Once a week is plenty due to its high intensity and joint load.

Does the JM Press help in a regular bench press?

Yes, it's one of the best exercises for strengthening the "lockout," where the triceps plays a decisive role.

The JM Press is your path to elite triceps strength and mass. Be technical, be consistent, and respect your elbows, and your results will surprise the whole gym.