How to do the Skull Crusher with correct form: setup, coaching cues, the muscles it works, the mistakes that stall progress, sets and reps, and the closest alt…
The skull crusher lowers a bar toward your forehead with the upper arms fixed, putting the triceps under a deep stretch. That stretched position drives more growth than pushdowns alone.
When to pick it. Pick skull crushers when you want the stretch-loaded half of triceps training that cable pushdowns don't provide.
Primary muscle: Triceps. Secondary: Front delts. Equipment: EZ bar + bench. Difficulty: intermediate.
Proper skull crusher form comes down to one thing: 'upper arms angled back' — keeps tension at the top instead of resting on the joint.
Lie on a flat bench holding an EZ bar over your chest. 'Elbows in' — flaring loses the triceps and irritates the joint.
The skull crusher works the triceps as the primary mover, with the front delts supporting.
Because the load path is fixed by the setup, changing your grip and torso angle shifts emphasis between those muscles more than changing weight does.
Most lifters get the best return from 3–5 sets of 4–8 reps for strength, or 3–4 sets of 8–12 for size on the skull crusher.
Heavy enough to drive neural and structural strength adaptations without burying recovery.
Skull Crusher variations mostly differ by grip width, incline angle, and implement.
Pick one variation and run it for a full block; rotating every session hides whether the skull crusher is actually progressing.
The skull crusher is a push — the elbows extend and the load travels away from your torso.
It loads the triceps first, with the front delts assisting, so place it where that tissue is fresh rather than where the split label says it should go.
Set the skull crusher up so that lie on a flat bench holding an EZ bar over your chest.
Angle the upper arms slightly back toward your head, not straight up. Getting this wrong is what turns the skull crusher into a front delts exercise instead of a triceps one.
On the skull crusher, the triceps produces horizontal shoulder adduction — the muscle that actually moves the load away from your torso.
The front delts finishes the lockout and keeps the shoulder joint tracking safely through the range.
Not trained directly, but the set ends when these give out — which is why skull crusher technique degrades before the triceps is truly finished.
Fix. Use an EZ bar and lighter weight; the angled grip is much kinder to the joint.
Fix. Only the forearms move. If the upper arms swing, the load is too high.
Fix. Tuck elbows to ~45° from the torso. Saves the shoulders and recruits more chest and triceps.
Fix. Pause for 1s on the chest. If you can't, the weight is too heavy for the range.
Prescription. 4–5 sets of 3–6 reps, 3–5 min rest, 1–2× per week.
Heavy enough to drive neural and structural strength adaptations without burying recovery.
Prescription. 3–4 sets of 8–12 reps, 90–120s rest, 2× per week.
Volume-rep zone where most muscle growth happens; spread across two sessions for frequency.
Prescription. 2–3 sets of 12–20 reps, 60–90s rest, 1–2× per week.
Higher reps build capacity and joint conditioning — useful for accessories and conditioning work.
Same horizPush pattern with a lower skill demand — the right swap if the skull crusher feels like a technique exercise rather than a training one.
Trains the same muscles with barbell + bench + rack instead of ez bar + bench — use it when the rack or the bar is taken.
Hits the triceps from a different pattern, which is useful as a second exposure later in the week rather than a straight replacement.
Zero-equipment fallback for hotel rooms and travel weeks. Lower load, so add reps or slow the tempo to keep the stimulus honest.
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Both are horizPush movements that load the triceps, so they compete for the same slot in a session rather than stacking on top of each other.
Pick the skull crusher when you have ez bar + bench and want the heaviest loadable version of the pattern.
Pick the barbell bench press when you only have barbell + bench + rack, or when you want a intermediate variation for a lighter or more technical day.
Elbow pain here is common. If it appears, switch to a cable overhead extension — same stretch, less joint compression.
Proper skull crusher form comes down to one thing: 'upper arms angled back' — keeps tension at the top instead of resting on the joint. Lie on a flat bench holding an EZ bar over your chest. 'Elbows in' — flaring loses the triceps and irritates the joint.
The skull crusher works the triceps as the primary mover, with the front delts supporting. Because the load path is fixed by the setup, changing your grip and torso angle shifts emphasis between those muscles more than changing weight does.
Most lifters get the best return from 3–5 sets of 4–8 reps for strength, or 3–4 sets of 8–12 for size on the skull crusher. Heavy enough to drive neural and structural strength adaptations without burying recovery.
Skull Crusher variations mostly differ by grip width, incline angle, and implement. Pick one variation and run it for a full block; rotating every session hides whether the skull crusher is actually progressing.
The skull crusher is a push — the elbows extend and the load travels away from your torso. It loads the triceps first, with the front delts assisting, so place it where that tissue is fresh rather than where the split label says it should go.
Set the skull crusher up so that lie on a flat bench holding an EZ bar over your chest. Angle the upper arms slightly back toward your head, not straight up. Getting this wrong is what turns the skull crusher into a front delts exercise instead of a triceps one.
The Skull Crusher is a intermediate triceps exercise using ez bar + bench. It's part of the horizPush pattern.
Anyone training the triceps pattern with access to ez bar + bench. It also suits lifters aliased searches like lying triceps extension.
Not as a first exercise in the horizPush pattern. Build to it from an easier variation before adding load.
Once or twice a week in most programs. Frequency depends on the training goal, the total weekly volume for triceps, and how much other work is already stressing the same pattern.