Tricep Pushdown vs Skull Crusher vs Overhead Extension: Which Builds Bigger Triceps?

The triceps make up two-thirds of the upper arm — and the three classic tricep isolation movements (pushdown, skull crusher, overhead extension) all build them, but they bias different heads. Most lifters run pushdowns heavily and the other two barely at all. Here's how each compares on head coverage, loading, and joint stress.

Quick Answer

Run the overhead tricep extension as your default stretched-position exercise — it's the only variation of the three that loads the long head in a fully stretched range, which research shows drives more growth per set. Pair it with a cable pushdown for the lateral and medial heads. Use the skull crusher when you want heavier loading on a single exercise — it trains all three heads simultaneously but with more elbow stress than the alternatives.

Side-by-Side Comparison

Cable Tricep Pushdown

High cable pulley with a straight bar, V-bar, or rope attachment. Stand close to the pulley, push the handle down by extending the elbows from chest level to thigh level. The upper arms stay pinned to the sides; only the forearms move.

What it does well: Constant tension throughout the range, easy to scale, low joint stress. The cable maintains a horizontal pull regardless of where the forearm is in the rep, so the triceps work hard from start to finish. The pinned-elbow position eliminates body english — every rep is direct elbow extension.

For lateral and medial head development specifically, pushdowns are excellent. The arm-at-side position loads these two heads through their full elbow extension range. Loading is moderate (typically 40–80 lbs of stack for working sets), but the per-set stimulus is high.

Where it falls short: Long head bias is low. The long head crosses both the shoulder and the elbow, and it's most active when the arm is overhead — exactly the position pushdowns don't put you in. Lifters who only run pushdowns end up with overdeveloped lateral and medial heads but a flat-looking long head from behind.

Programming: 3 sets of 10–15 reps, 1–2× per week. See cable tricep pushdown, tricep pushdown, and the rope variation rope tricep extension. Pair with overhead extensions on the same day for full coverage — see Best Tricep Exercises for Size.

Skull Crusher

Lying on a flat bench with an EZ barbell extended over the chest, lower the bar toward the forehead or just behind the head by bending at the elbows. The upper arms stay roughly vertical (or angled slightly back); only the forearms move. Press back up to lockout.

What it does well: Trains all three tricep heads simultaneously with high loading. The lying position keeps the upper arms in a fixed vertical orientation, which means the triceps work through their full elbow extension range without help from the shoulders. EMG data shows skull crushers produce comparable activation to pushdowns and overhead extensions across all three heads.

The EZ bar in particular is a great compromise — heavier loading than dumbbells (because both arms work together) plus angled grips that protect the wrists.

Where it falls short: Elbow joint stress. The straight-bar variant in particular forces the wrists into a position that strains the elbow joint over time. Even with the EZ bar, lifters with elbow tendinitis history often find skull crushers aggravate their symptoms. Loading too heavy or going too low (bar to nose or eyes) makes the strain worse.

The other limitation is bar path. Many lifters end up doing a hybrid skull crusher / close-grip bench press — the elbows drift forward as the bar comes down, which shifts work onto the chest and shoulders. Strict form keeps the elbows directly over the shoulders throughout.

Programming: 3 sets of 8–12 reps. See skull crushers.

Overhead Tricep Extension

Stand or sit holding a dumbbell with both hands behind the head, or a cable rope with hands behind the neck. Extend the elbows so the weight rises overhead, keeping the upper arms tight to the head. Only the forearms move.

What it does well: The only common tricep exercise that loads the long head in a fully stretched position. The long head crosses the shoulder, and it's most stretched when the shoulder is fully flexed (arm overhead). Multiple studies on lengthened-position training (Maeo et al.) show this stretched-position work produces materially more hypertrophy per set than shortened-position equivalents.

For lifters whose long head lags behind the lateral and medial heads — a common pattern in lifters who run mostly pushdowns and bench press — adding overhead extensions 1–2× per week closes the gap visibly in 6–10 weeks. The change in arm shape (back of the arm filling out from behind) is one of the most rewarding training results.

Where it falls short: Loading is moderate. The stretched-position is mechanically harder than a pushdown or skull crusher, and the load is over your head — exposed if anything goes wrong. Most lifters underload overhead extensions out of caution. The lighter weight is fine for hypertrophy, but lifters chasing strength gains will get more raw progression on skull crushers or close-grip bench.

Programming: 3 sets of 10–15 reps with controlled tempo. See overhead tricep extension and rope tricep extension.

What the Research Says

Direct head-to-head comparisons of the three tricep exercises point to two consistent findings:

1. Long-head activation is significantly higher in overhead extensions than pushdowns or skull crushers. A 2018 study by Wakahara et al. comparing tricep exercises with EMG and MRI cross-sectional area changes found the long head responded preferentially to overhead positions over time. Pushdowns produced minimal long-head growth; overhead extensions produced significant growth.
2. Total tricep activation is comparable across all three at matched effort. All three exercises produce roughly equivalent peak activation across the full triceps muscle group. The differences are in head bias, not total stimulus.

Practical takeaway: pushdowns and skull crushers cover the lateral and medial heads well; overhead extensions are necessary to fully develop the long head. A complete tricep program needs at least one of each.

Pair Them, Don't Pick One

The strongest tricep program uses at least two of these three exercises per workout. Common pairings:

• Overhead extension + pushdown: stretched + contracted positions covered. Best for hypertrophy with low joint stress.
• Skull crusher + pushdown: heavy compound + finisher. Best for lifters who tolerate skull crushers well.
• Overhead extension + skull crusher: maximum stretched-position emphasis, double long-head loading.

For pure long-head development, pair overhead extension with another long-head-biased move (e.g., cable single-arm overhead extension) and run pushdowns less frequently.

How to Pick

Run pushdowns as your default if you want a high-volume tricep finisher with low joint stress, or you're rotating between many tricep exercises.

Run skull crushers if you want heavy compound tricep loading and your elbows tolerate them well. Use the EZ bar, not the straight bar.

Run overhead extensions if your long head is underdeveloped (visible from behind), you want maximum hypertrophy stimulus per set, or you've plateaued on pushdowns.

Rotate the third exercise across the week if you train triceps twice. Sample week: Monday — overhead extension + pushdown; Thursday — skull crusher + rope extension.

The Bottom Line

All three tricep exercises build the triceps, but they bias different heads. Pushdowns cover the lateral and medial heads with constant tension; skull crushers train all three with heavier loading; overhead extensions are the long-head specialist. Run two of the three per tricep workout, target both stretched and contracted positions, and the triceps grow.

For more, see our Best Tricep Exercises for Size hub, the Hammer Curl vs Reverse Curl vs Zottman Curl comparison for matched bicep approach, and the bigger arms program.