How is a skullcrusher push up different from a regular push up?

A skullcrusher push up is a triceps-focused variation of the standard push up. The difference is the elbow position: instead of letting your elbows flare out at 45-90 degrees, you keep them tucked tight against your ribs the entire rep. Feet are together, body stays rigid, and the descent is slow while the concentric is explosive. That small change in elbow path shifts load off the chest and drives it into the triceps.

Skullcrusher Push Up: Form Guide & Tips (2026)

Summary The skullcrusher push up is a triceps-focused bodyweight push up variation. It looks like a standard push up, but with two key differences: the elbows stay tucked tight against the ribs (instead of flaring out) and the feet stay together. That elbow-tucked position shifts load off the chest and onto the triceps brachii, hammering all three heads of the triceps — the long, lateral, and medial heads. The concentric is explosive (push the earth away) and the eccentric is slow and controlled. Body stays rigid head to heels with glutes squeezed and core braced. Beginners start on their knees for 3 sets of 5-8. Intermediate and advanced lifters build to 3 sets of 8-12 from the toes before adding feet-elevated or weighted progressions.

Here's the thing about standard push ups: they're a great compound movement, but the chest steals most of the work. If you actually want to build your triceps with a push up, you have to change the elbow angle. That's where the skullcrusher push up comes in. Same body position as a regular push up. Same plank setup. One critical difference — your elbows stay glued to your ribs the entire rep. Nothing flared. Nothing splayed. Just tight, tucked, and tracking straight back behind you.

So why does that one change transform a regular push up into a triceps-focused exercise? It's all about elbow path. When your elbows flare out to the sides, the pecs and front delts take over because the press becomes a horizontal adduction movement. When the elbows stay tucked, the shoulder joint moves through extension and the elbow extends at the top of the rep. That biomechanical shift loads the triceps brachii much more directly (Gottschall et al., 2018). Add a slow, controlled descent and an explosive press, and you've built a legitimate triceps exercise without touching a single piece of equipment.

Here's the practical takeaway. If you've built a base with push ups and want to put more emphasis on your triceps at home, the skullcrusher push up is one of the cleanest ways to do it. It's also one of the hardest to cheat — the moment your elbows flare or your hips sag, the set is basically over. Keep it honest, and your triceps will know about it for days.

Skull crusher push up muscles targeted anatomical diagram showing all three heads of the triceps brachii as primary movers with anterior deltoids, chest, and core as stabilizers — Skull crusher push up muscles targeted: all three heads of the triceps brachii do the work, while the core and delts stabilize a rigid plank position.

Quick Facts

Primary Muscles	Triceps brachii (long, lateral, and medial heads)
Secondary Muscles	Anterior deltoids, pectoralis major, core stabilizers, serratus anterior
Equipment	Bodyweight (no equipment needed)
Difficulty	Intermediate
Movement Type	Compound · Horizontal press · Bodyweight
Category	Strength
Good For	Triceps development at home, no-equipment upper body strength, push up variation to target the arms, progression past standard push ups

How to Do a Skull Crusher Push Up (Step-by-Step)

Set up in a forearm plank. Get on the floor with your forearms down, elbows bent at roughly 90 degrees. Your elbows should sit under or just slightly in front of your shoulders. Not way out in front. Not pinned under. Hands in loose fists or palms flat. Body in a straight line from head to heels. Core braced. Glutes squeezed. Shoulders pulled away from your ears.
Press through your hands and extend the elbows. This is the only thing that moves. Push through your palms and drive your elbows into full extension. Your body pivots as one rigid plank. Head, shoulders, hips, and heels all rising at the same rate, until you reach the top of a push up position with your arms straight. Don't let your shoulders shoot forward. Don't let your hips sag or pike.
Lower back to forearms under control. Bend only at the elbows and lower yourself back to the forearm plank position. Take 2 to 3 seconds on the way down. The eccentric is where most of the triceps stimulus lives, so don't rush it. Your forearms return to the floor. Your body stays straight as a board the entire time.
Reset and repeat. Re-brace your core in the forearm plank, confirm you're still a straight line, and go again. Beginners: 3 sets of 5-8 reps from the knees. Intermediate and advanced: 3 sets of 8-12 reps from the toes. If you can't do 5 clean reps from your knees, start with negatives only. Press up with both legs, then lower for 4 seconds. That's one rep.

Coach Ty's Tips: Skull Crusher Push Up

These cues come directly from Coach Ty, FitCraft's 3D AI coach:

Only the elbows move. This is the defining cue of the entire exercise. If your shoulders are rolling forward or your hips are bouncing, you're turning it into a weird little push up. Lock the shoulder joint. Lock the hip joint. Only the elbow hinge opens and closes. Every rep.
Elbows track forward, not out. Just like a barbell skull crusher, your elbows should point forward or just slightly outward. Not flaring wide to the sides. Flared elbows turn the movement into a short-range press and pull tension off the triceps. Tight elbows, long triceps.
Head stays behind the hands. At the bottom of the rep, your head should be roughly level with or slightly behind your hands. Not jutting out in front. If your head drifts forward, you're leaning into the movement with your shoulders and stealing load off the triceps.
Rigid as a plank. From the side, someone should be able to lay a broomstick from your head to your heels, and it would stay straight. Every single rep. If your hips sag at the top or pike up at the bottom, the set is over. Your core isn't holding the position anymore, and the triceps can't do their job without it.
Slow the eccentric. Honestly, this exercise rewards a slow negative more than almost any other bodyweight move out there. Two or three seconds down, a short pause at the bottom, then press. The triceps are under tension the entire descent. And that time under tension is where the muscle actually grows.

Skull crusher push up proper form showing forearm plank bottom position and top push up position with only the elbow joint hinging while the body stays rigid — Skull crusher push up proper form: forearm plank at the bottom, straight-arm top position, body rigid as a single plank throughout — only the elbow joint moves.

Common Mistakes to Avoid

Look, the skull crusher push up has the smallest margin for error of any bodyweight triceps exercise. Here's what goes wrong most often, and how to fix it.

Shoulders rolling forward. The single most common mistake. Instead of keeping the shoulder joint still, people shift their entire upper body forward as they press, turning the movement into a weird hybrid push up. The fix: think about pulling your shoulders back and down, away from your ears. Press straight up through your hands without letting your chest drift forward.
Sagging or piking hips. When the core isn't strong enough to hold a rigid plank, the hips either drop at the top (low back compresses) or pike up at the bottom (cheating the movement into a mini-pike push up). The fix: squeeze your glutes like you're pinching a quarter, brace your abs, and stop the set the moment you feel either the sag or the pike show up.
Flaring the elbows. Elbows drifting out to the sides turns the exercise into a short-range press and reduces the triceps stimulus. The fix: keep your elbows pointing forward or just slightly outward, tracking in line with your shoulders. If they won't stay tight, you're too tired for that set. End it.
Using momentum to bounce back up. Dropping fast onto the forearms and using the rebound to pop back up is cheating the triceps out of the hardest part of the movement. The fix: 2-3 seconds down every rep, full stop at the bottom, then press. No bounce. No rebound.
Half reps. Only extending the elbows partway at the top, or not lowering all the way down to the forearms. Half reps cut the triceps stimulus roughly in half. The fix: full forearm contact at the bottom, full elbow extension at the top. If you can't get full range, regress to the knees. No shame in that.

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Skull crusher push up progression ladder from kneeling variation to standard floor version to feet elevated to deficit with elevated hands, showing increasing triceps difficulty — Skull crusher push up progressions: from kneeling (intermediate) to deficit with elevated hands (expert).

Variations: From Knees to Deficit

Kneeling Skull Crusher Push Up (Intermediate)

The same movement, just from your knees instead of your toes. Dropping the pivot point to the knees cuts roughly a third of your bodyweight out of the lift and shortens the lever, so the movement becomes accessible to people who can't yet do a single rep from the toes. It's still not easy. The elbow isolation is still brutal. But it lets you build the form pattern first. Work up to 3 sets of 10-12 kneeling reps with a 2-second eccentric before moving on.

Standard Skull Crusher Push Up (Expert)

The full version from a toes-up forearm plank, described in the step-by-step above. This is what Coach Ty programs for intermediate and advanced lifters in FitCraft's bodyweight triceps quests. Your bar to clear: 3 sets of 10 clean reps, 2-second eccentric, zero form breakdown.

Feet-Elevated Skull Crusher Push Up (Expert+)

Feet up on a bench or step, forearms on the floor. Elevating the feet loads more bodyweight through the arms and piles on a serious shoulder stability demand. Start with a low surface. 6 to 12 inches is plenty. Any higher and the shoulders start taking over what should be a triceps-only movement.

Deficit Skull Crusher Push Up (Expert+)

Hands on push-up handles, yoga blocks, or parallettes while your forearms stay on the floor. The elevated hands give you extra range of motion at the top and more time under tension for the triceps. Only attempt this after you can do 3 clean sets of 12 standard skull crusher push ups. Earn it first.

Alternative Exercises

Diamond push ups: If full skull crusher push ups are out of reach, build triceps base strength with diamond push ups first. Aim for 3 sets of 12-15 before progressing.
Skull crushers (barbell/dumbbell): If you have weights and want the same movement pattern with adjustable load, the classic lying triceps extension targets the same muscles with more precise progressive overload.

Programming Tips

Beginners: 3 sets of 5-8 reps from the knees. Focus on rigid plank position and a controlled 2-second eccentric. Rest 90-120 seconds between sets. Do not attempt the toes version until 3 sets of 10-12 kneeling reps are clean.
Intermediate: 3-4 sets of 8-12 reps from the toes. Use a 3-1-2 tempo (3 down, 1 at the bottom, 2 up). Place this exercise near the start of your triceps work, while fresh. Pair with a pulling exercise like bent over rows for balanced upper body development.
Advanced: 3-4 sets of 10-15 reps, or use feet-elevated/deficit variations for 3 sets of 6-10. Weighted vest progression works well here if your form is bulletproof. Keep weekly triceps volume moderate — this exercise hits hard and recovery takes longer than diamond push ups.
Frequency: 1-2 times per week. Because the skull crusher push up isolates the elbow joint, it creates more concentrated stress on a small muscle group and recovers slower than compound pressing exercises. Don't stack it with heavy bench or dip work on back-to-back days.

FitCraft's AI coach Ty programs skull crusher push ups based on your pressing strength, triceps development, and whether you've cleared the prerequisite diamond push up benchmark. He selects kneeling, standard, or elevated variations based on your level and adjusts tempo as you progress. The 3D demonstrations show you exactly what a rigid plank pivot looks like from multiple angles — which is the detail that makes or breaks this exercise.

Frequently Asked Questions

What muscles do skull crusher push ups work?

The skull crusher push up primarily targets all three heads of the triceps brachii — the long, lateral, and medial heads. Unlike a standard push up, the elbow-only hinge isolates the triceps much more directly. Secondary muscles include the anterior deltoids, pectoralis major, and the core stabilizers that keep your body rigid as a plank during the movement.

Are skull crusher push ups harder than diamond push ups?

Yes, for most people. Diamond push ups are still a compound pressing movement — the shoulders and chest contribute to the lift. The skull crusher push up is closer to a true isolation exercise because only the elbow joint moves, so the triceps take essentially all the load. Expect to do significantly fewer reps than you can with diamond push ups.

Can I do skull crusher push ups without weights?

Yes — that's the whole point. The skull crusher push up is the bodyweight equivalent of a barbell skull crusher. You use your own bodyweight as resistance by pivoting from a forearm plank into a top push up position using only your triceps. No barbell, no dumbbells, no bench required.

How many skull crusher push ups should I do?

For triceps strength and hypertrophy, 3-4 sets of 8-15 reps is the sweet spot. Beginners should start on the knees for 3 sets of 5-8 and build form first. If you can already do more than 15 clean reps from the toes, slow the tempo or switch to a deficit variation rather than chasing higher rep counts.

Are skull crusher push ups bad for your elbows?

They can be if you load them with sloppy form. Because the movement isolates the elbow joint, any joint stress goes directly into the elbow rather than being shared with the shoulder. Keep your elbows tracking forward rather than flared, use a 2-3 second eccentric, and stop the set the moment your form breaks down. If you have a history of tennis elbow or triceps tendonitis, build up gradually from the knees.

Skullcrusher Push Up: Proper Form, Tips & Progressions