Barbell Reverse Grip Skullcrusher vs Jm Press

Compare target muscles, equipment, difficulty, movement type, and secondary muscles for Barbell Reverse Grip Skullcrusher and Jm Press.

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Barbell Reverse Grip Skullcrusher vs JM Press — which should you pick for triceps progress? You’ll get a clear, practical breakdown: how each exercise hits the triceps heads, what secondary muscles come into play, equipment and form cues, rep ranges, and when to program each movement. Readable, technical cues and specific rep/load guidance will help you choose by goal — hypertrophy, strength, or minimal-equipment training — and reduce risk by fixing common form faults.

Exercise A

Barbell Reverse Grip Skullcrusher

Target Triceps

Equipment Barbell

Body Part Upper-arms

Difficulty Intermediate

Movement Isolation

Secondary Muscles

Forearms

Exercise B

Jm Press

Target Triceps

Equipment Barbell

Body Part Upper-arms

Difficulty Advanced

Movement Compound

Secondary Muscles

Chest Shoulders

Muscles used

Listed target and secondary muscles, shown on the body. Locations, not activation or strength scores.

Target
Secondary
Not highlighted

Barbell Reverse Grip Skullcrusher

Front

Back

Target: Triceps
Secondary: Forearms

Jm Press

Front

Back

Target: Triceps
Secondary: Chest, Shoulders

Not shown on diagram: Shoulders. These labels do not identify a precise region on this map.

Grey does not mean a muscle is unused. The diagrams show only the mapped catalogue labels.

Attribute	Barbell Reverse Grip Skullcrusher	Jm Press
Target Muscle	Triceps	Triceps
Body Part	Upper-arms	Upper-arms
Equipment	Barbell	Barbell
Difficulty Different	Intermediate	Advanced
Movement Type Different	Isolation	Compound
Secondary Muscles Different	Forearms	Chest, Shoulders

Visual Comparison

An illustrative 1–10 profile derived from catalog difficulty, equipment, and listed-muscle fields—not measured performance or muscle activation.

Key Differences

Barbell Reverse Grip Skullcrusher is an isolation exercise, while Jm Press is a compound movement.
Difficulty levels differ: Barbell Reverse Grip Skullcrusher is intermediate, while Jm Press is advanced.
Both exercises target the Triceps using Barbell. The catalogue does not establish which exercise is better for an individual goal.

Muscle comparison

Shared target muscles

Both movements prioritize elbow extension and therefore target the triceps as the prime mover. The skullcrusher is more of a pure elbow-extension isolation, loading the triceps through a large change in muscle length with minimal horizontal pressing. The JM press blends elbow extension with a horizontal pressing vector, so while it still targets the triceps, it allows higher absolute loads and shares force with the pecs and anterior deltoids.

Secondary muscle differences

Barbell Reverse Grip Skullcrusher recruits the forearms and wrist stabilizers more due to the underhand grip; secondary chest and shoulder involvement is minimal. JM Press recruits chest and anterior shoulder fibres substantially because the bar follows a slightly angled, horizontal path; expect notable pec and anterior deltoid recruitment, especially at heavier sets. The JM press therefore distributes load across larger muscle groups and reduces isolated elbow-only stress compared with the skullcrusher.

Muscle involvement analysis

Skullcrushers place the triceps under long-axis tunnel-like tension: the long head operates at longer lengths when the shoulder is extended slightly, and peak torque occurs near terminal elbow extension. Reverse-grip changes forearm rotation and shifts the force vector so medial/lateral heads and forearm extensors engage more for stabilization. JM Press shifts some demand into horizontal force production, so triceps activation is concurrent with pectoral and anterior deltoid activation; elbow extension torque is shared across those muscles rather than concentrated solely on the triceps.

Equipment and setup

Barbell Reverse Grip Skullcrusher: setup

Barbell, flat bench, and enough rack space to safely un-rack and re-rack. An EZ bar can reduce wrist strain if needed, but a straight bar works.

Jm Press: setup

Barbell and flat bench (or rack). A spotter is recommended when loading heavy because the JM press uses a press-like finish and higher absolute loads.

Access and practicality

Barbell Reverse Grip Skullcrusher — easier to set up and safer to perform solo with light-to-moderate loads. JM Press requires tighter technique and a spotter when you push near max loads.

Learning and progression

Learning the movements

Skullcrusher (intermediate) is easier to learn because it’s a single-joint elbow hinge with clear range-of-motion cues. JM Press (advanced) requires coordinated elbow-hinge plus a controlled, slightly angled press path that blends pressing timing and elbow positioning.

Progression considerations

JM Press offers higher progression potential for absolute strength because you can recruit chest and shoulders to lift heavier loads—expect to use 5–20% heavier weights than for skullcrushers once technique is solid. Skullcrushers offer linear hypertrophy progress via tighter volume control and isolation loading (8–12 rep ranges, 3–5 sets).

Limitations and precautions

Skullcrushers carry higher risk of localized elbow or distal triceps tendon overload if you regularly train to failure or use ego loads; wrist strain can occur with a straight bar. JM Press shifts some stress to the shoulders and chest, lowering pure elbow-tendon load, but poor bar path or flared elbows can irritate the anterior shoulder.

Pros & Cons

Barbell Reverse Grip Skullcrusher

+ Pros

Direct triceps isolation for focused muscle growth
Lower systemic fatigue — ideal for high-volume triceps work (8–12 reps)
Requires minimal coaching once basic hinge mechanics are reliable
Reverse grip increases forearm/stabilizer engagement and can reduce wrist extension stress

− Cons

High localized elbow and tendon stress under heavy loads
Limited load capacity compared with compound presses
Form breakdown (elbow flare/prolonged extension) quickly increases injury risk

Jm Press

+ Pros

Compound pattern allows heavier loads and more strength transfer
Recruits chest and anterior deltoid to share load, reducing pure elbow strain
Great for bridging bench-press strength and triceps overload
Efficient for combining strength and size work in fewer exercises

− Cons

More complex technique — timing of press and elbow hinge must be precise
Higher shoulder stress if bar path or elbow tuck is incorrect
Less pure triceps isolation; harder to target specific triceps heads

When Each Exercise Wins

For muscle hypertrophy: Barbell Reverse Grip Skullcrusher

Skullcrushers place continuous, isolated tension on the triceps across a large length change, making them ideal for 8–12 rep hypertrophy blocks and focused volume. Use progressive overload with strict form to minimize elbow tendon load.

For strength gains: JM Press

The JM press lets you use heavier loads by recruiting pecs and delts alongside the triceps, boosting overall pressing strength and transfer to bench variations. Work in lower rep ranges (4–6) to build maximal force.

For beginners: Barbell Reverse Grip Skullcrusher

The skullcrusher’s single-joint pattern is easier to learn and coach: keep the upper arms steady and hinge at the elbows. Beginners can safely progress with lighter loads and higher reps while mastering elbow mechanics.

For home workouts: Barbell Reverse Grip Skullcrusher

You only need a barbell and bench to perform skullcrushers with effective volume. JM press is doable at home, but heavier loading safely requires a spotter or rack setup for re-racking.

Frequently Asked Questions

Can I do both Barbell Reverse Grip Skullcrusher and JM Press in the same workout?

Yes. Pairing them works well: do the JM press first for heavy compound sets (3–5 sets of 4–6 reps), then follow with skullcrushers for isolation volume (3–4 sets of 8–12 reps). That order uses the compound to handle heavier loads while the isolation provides targeted fatigue.

Which exercise is better for beginners?

Barbell Reverse Grip Skullcrusher is generally better for beginners because it’s a simpler elbow-hinge pattern to learn and allows controlled volume. Start light, focus on keeping the elbows steady, and use 8–12 reps to build tolerance.

How do the muscle activation patterns differ?

Skullcrushers create a primarily vertical force vector that isolates elbow extension, maximizing triceps length-tension work. JM Press introduces a horizontal force component, so triceps act alongside the pecs and anterior deltoids; this distributes torque and permits heavier loads.

Can JM Press replace Barbell Reverse Grip Skullcrusher?

JM Press can substitute when you want more load and strength transfer, but it won’t match the skullcrusher for pure triceps isolation. If your goal is targeted triceps size or rehab of weak elbow tendons, keep skullcrushers in the program.

Comparison Summary

Choose the Barbell Reverse Grip Skullcrusher when your goal is targeted triceps hypertrophy and controlled volume. It’s the better option for isolating the elbow-extensors, dialing in 8–12 rep sets, and minimizing systemic fatigue. Choose the JM Press when you want to increase pressing strength or move heavier loads; its horizontal force vector engages pec and anterior deltoid, allowing you to overload the triceps with compound assistance. Program both across phases: use skullcrushers in accumulation blocks for muscle growth and JM presses in strength or transfer phases to build load capacity and pressing power.

Exercise instructions

Steps from the exercise catalogue. Read the full sequence before starting.

Barbell Reverse Grip Skullcrusher

Lie flat on a bench with your feet flat on the ground and your head at the end of the bench.
Hold the barbell with a reverse grip, palms facing towards your face, and your hands shoulder-width apart.
Extend your arms straight up over your chest, keeping your elbows in and your wrists straight.

Read remaining steps for Barbell Reverse Grip Skullcrusher

Slowly lower the barbell towards your forehead by bending your elbows, keeping your upper arms stationary.
Pause for a moment at the bottom, then extend your arms back up to the starting position.
Repeat for the desired number of repetitions.

Jm Press

Start the exercise the same way you would a close grip bench press. You will lie on a flat bench while holding a barbell at arms length (fully extended) with the elbows in. However, instead of having the arms perpendicular to the torso, make sure the bar is set in a direct line above the upper chest. This will be your starting position.
Now beginning from a fully extended position lower the bar down as if performing a lying triceps extension. Inhale as you perform this movement. When you reach the half way point, let the bar roll back about one inch by moving the upper arms towards your legs until they are perpendicular to the torso. Tip: Keep the bend at the elbows constant as you bring the upper arms forward.
As you exhale, press the bar back up by using the triceps to perform a close grip bench press.

Read remaining steps for Jm Press