Barbell JM Bench Press vs Barbell Lying Back Of The Head Tricep Extension

Compare target muscles, equipment, difficulty, movement type, and secondary muscles for Barbell JM Bench Press and Barbell Lying Back Of The Head Tricep Extension.

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Barbell Jm Bench Press vs Barbell Lying Back Of The Head Tricep Extension — two barbell triceps builders that look similar but load your arms very differently. You’ll get clear guidance on which exercise best fits your goals, whether you're chasing muscle growth, raw strength, or safer isolation work. I’ll compare primary and secondary muscle activation, equipment needs, difficulty and injury risk, and show how to cue each lift for better range of motion and tension. Read on and pick the move that suits your training plan and shoulder/elbow history.

Exercise A

Barbell JM Bench Press

Target Triceps

Equipment Barbell

Body Part Upper-arms

Difficulty Intermediate

Movement Compound

Secondary Muscles

Chest Shoulders

Exercise B

Barbell Lying Back Of The Head Tricep Extension

Target Triceps

Equipment Barbell

Body Part Upper-arms

Difficulty Intermediate

Movement Isolation

Secondary Muscles

Shoulders

Muscles used

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

Target
Secondary
Not highlighted

Barbell JM Bench Press

Front

Back

Target: Triceps
Secondary: Chest, Shoulders

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

Barbell Lying Back Of The Head Tricep Extension

Front

Back

Target: Triceps
Secondary: 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 JM Bench Press	Barbell Lying Back Of The Head Tricep Extension
Target Muscle	Triceps	Triceps
Body Part	Upper-arms	Upper-arms
Equipment	Barbell	Barbell
Difficulty	Intermediate	Intermediate
Movement Type Different	Compound	Isolation
Secondary Muscles Different	Chest, Shoulders	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 JM Bench Press is a compound movement, while Barbell Lying Back Of The Head Tricep Extension is an isolation exercise.
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 exercises target the triceps, but they emphasize different heads. The JM bench press uses a slightly narrower grip and a slight incline of the forearms to transfer force through the long and lateral heads while still recruiting the medial head—this compound pattern lets you use near 75–90% of your 1RM pressing strength. The lying back-of-head extension places the shoulder into greater flexion, lengthening the long head and increasing its relative workload; expect higher long-head tension at end-range due to length-tension mechanics.

Secondary muscle differences

Secondary recruitment differs because of force vectors: the JM bench press loads the chest and anterior deltoid as stabilizers and prime movers during the press-out portion, so pec and shoulder EMG are higher compared to the pure extension. The lying back-of-head extension minimizes chest involvement and shifts stabilizing demand to the posterior deltoids and scapular retractors to control bar path, so shoulder muscles assist mainly isometrically.

Muscle involvement analysis

JM bench press creates a mixed push pattern—horizontal adduction plus elbow extension—so triceps fire in concert with pec/shoulder as concentric force rises from ~60° elbow flexion to full extension. Lying back-of-head extension isolates elbow extension through a larger ROM (elbow can start at ~120° flexion), increasing time under tension for the triceps long head as the shoulder is flexed overhead, changing the muscle’s moment arm and shifting peak force toward mid-to-deep range.

Equipment and setup

Barbell JM Bench Press: setup

Barbell Jm Bench Press requires a barbell, flat bench, and rack for safety. A spotter or safety pins are recommended when working heavy near 1–3RM.

Barbell Lying Back Of The Head Tricep Extension: setup

Barbell Lying Back Of The Head Tricep Extension needs a barbell and flat bench; for comfort use a padded bar or EZ bar to reduce wrist stress. A spotter can help guide the bar over the head and prevent loss of control.

Access and practicality

Barbell Jm Bench Press is the accessibility winner because it leverages the common bench press setup most gyms already have, and many lifters can rep moderate loads without the same shoulder mobility demands required by back-of-head extensions.

Learning and progression

Learning the movements

JM Bench Press has a shallow-to-moderate learning curve if you already bench press—learn to narrow grip to about shoulder-width minus 1–2 inches and keep elbows tucked ~30° to protect the shoulder. Back-of-head extensions require better thoracic and shoulder mobility and precise bar path control, so they’re slightly harder to teach.

Progression considerations

JM bench press offers greater progression options: increase load in 2.5–5% jumps, use paused reps, or vary grip width to shift emphasis. The lying extension is more limited by elbow joint stress and often progresses with higher reps (8–15) or controlled tempo rather than big jumps in weight.

Limitations and precautions

Relative injury risk is higher with the lying back-of-head extension for lifters with limited external rotation or previous shoulder impingement because the shoulder is placed in end-range flexion. JM bench press risks include overloading the wrists and elbow stress if form breaks down, but overall risk is lower when using proper elbow tuck and load progression.

Pros & Cons

Barbell JM Bench Press

+ Pros

Loads triceps with heavy, compound pressing—good for strength
Engages chest and shoulders for greater overall force production
Easier to progress in load with small weight increments
Uses standard bench setup available in most gyms

− Cons

Less pure isolation of the triceps long head
Requires careful elbow positioning to avoid elbow stress
Can limit peak stretch on long head due to shortened shoulder position

Barbell Lying Back Of The Head Tricep Extension

+ Pros

Places the triceps long head under a large stretch for hypertrophy
Isolates elbow extension with minimal chest involvement
Useful for finishing sets and creating high time-under-tension
EZ bar option reduces wrist strain compared to straight bar

− Cons

Higher shoulder mobility demands and impingement risk
Harder to add heavy load safely; progression often limited
Requires careful control to avoid dropping weight behind head

When Each Exercise Wins

For muscle hypertrophy: Barbell Lying Back Of The Head Tricep Extension

The back-of-head extension stretches the triceps long head through a longer ROM and keeps constant tension, boosting time under tension for 8–15 rep sets. That increased muscle length under load favors hypertrophy via sarcomere remodeling and metabolic stress.

For strength gains: Barbell Jm Bench Press

JM bench press lets you use heavier absolute loads (75–90%+ of pressing capacity) because it blends bench mechanics with elbow extension, making neural and mechanical overload easier to achieve for 3–6 rep ranges.

For beginners: Barbell Jm Bench Press

Beginners can transfer existing bench press skills to a JM press with modest coaching, while back-of-head extensions require mobility and precise bar control that novices often lack.

For home workouts: Barbell Jm Bench Press

If you have a bench and rack, the JM press is safer to load progressively at home. The back-of-head extension demands strict form and is riskier without a spotter or proper clearance.

Frequently Asked Questions

Can I do both Barbell Jm Bench Press and Barbell Lying Back Of The Head Tricep Extension in the same workout?

Yes — pair them by priority: do JM bench press early for heavy sets (3–6 or 6–8 reps) then use back-of-head extensions as a finisher for 8–12 reps to add volume and stretch the long head. Monitor elbow and shoulder fatigue and reduce load if technique breaks.

Which exercise is better for beginners?

The JM bench press is better for most beginners because it builds on bench press mechanics and allows safer progressive overload. Back-of-head extensions require more shoulder mobility and fine motor control, which can increase injury risk for novices.

How do the muscle activation patterns differ?

JM bench press combines horizontal push and elbow extension so triceps activation rises with chest/shoulder involvement; peak triceps force occurs as the elbow approaches extension. Back-of-head extensions lengthen the long head at the shoulder, increasing its relative activation through the deeper portions of the ROM and emphasizing eccentric tension.

Can Barbell Lying Back Of The Head Tricep Extension replace Barbell Jm Bench Press?

Not fully — the lying extension isolates the long head and is great for hypertrophy, but it won’t provide the same heavy, compound overload or chest/shoulder carryover as the JM press. Choose the extension when targeting long-head size; use the JM press when you need strength and heavier loading.

Comparison Summary

Use the Barbell JM Bench Press when your goal is to build pressing strength and add heavy, compound overload to the triceps while leveraging chest and shoulder assistance. Aim for 3–6 reps for strength blocks or 6–10 reps for mixed hypertrophy while keeping elbows tucked ~30° and a firm wrist alignment. Choose the Barbell Lying Back Of The Head Tricep Extension when you want focused hypertrophy of the triceps long head: use 8–15 reps, slow 2–3 second eccentrics, and stop short of painful shoulder end-range. If shoulder health or mobility is a concern, favor JM presses or substitute with skull crushers to chest level or cable variations.

Exercise instructions

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

Barbell JM Bench Press

Lie flat on a bench with your feet flat on the ground and your back pressed against the bench.
Grasp the barbell with an overhand grip, slightly wider than shoulder-width apart.
Lower the barbell to your chest, keeping your elbows tucked in close to your body.

Read remaining steps for Barbell JM Bench Press

Push the barbell back up to the starting position, fully extending your arms.
Repeat for the desired number of repetitions.

Barbell Lying Back Of The Head Tricep Extension

Lie flat on a bench with your feet flat on the ground and your head at the end of the bench.
Hold a barbell with an overhand grip, hands shoulder-width apart, and extend your arms straight up over your chest.
Keeping your upper arms stationary, slowly lower the barbell behind your head by bending your elbows.

Read remaining steps for Barbell Lying Back Of The Head Tricep Extension