Triceps · Isolation movement

Incline Dumbbell Skull Crusher

A isolation exercise that targets the triceps. Performed with dumbbells, incline bench.

Primary muscle

Triceps

Secondary muscles

–

Equipment

Dumbbell

Difficulty

Beginner

What is the Incline Dumbbell Skull Crusher?

The incline dumbbell skull crusher is a lying triceps extension done on an incline bench with a dumbbell in each hand. The incline angles the upper arms further behind the head for a deeper long-head stretch, while the neutral dumbbell grip eases wrist and elbow strain and evens out side-to-side differences.

Muscles worked

Primary: Triceps
The triceps extends the elbows to press the dumbbells back up; the incline angle deepens the stretch on the long head while independent dumbbells load each arm through a long range.

How to perform the Incline Dumbbell Skull Crusher

  1. Set an incline bench to about 30 to 45 degrees and lie back holding a dumbbell in each hand pressed over the shoulders with a neutral grip.
  2. The incline keeps tension on the long head at lockout, and the neutral dumbbell grip spares the wrists and lets each arm move on its own.
  3. Keep the upper arms fixed and angled slightly back toward the head throughout the set.
  4. Bend the elbows to lower the dumbbells toward the sides of the head, keeping them from flaring outward.
  5. Feel the long-head stretch beside the head, then extend the elbows to press the dumbbells back up.
  6. Control the eccentric and avoid letting the dumbbells drift behind the head, which strains the elbow.

Suggested working range: 10–15 reps. Default progression: double progression.

Mechanics

A single-joint isolation on an incline bench: elbow extension with the upper arms angled back behind the head and a dumbbell in each hand. The incline lengthens the long head at the bottom, and the neutral dumbbell grip reduces the joint strain a fixed bar can cause.

Form cues

  • •Set a moderate incline, lie back, and hold the dumbbells with a neutral grip.
  • •Lower them behind your head to a deep stretch, keeping the elbows tucked.
  • •Extend by straightening the elbows only, keeping the upper arms fixed.
  • •Control the lowering into the stretch rather than dropping the dumbbells.

Common mistakes

  • •Letting the dumbbells drift behind the head, which strains the elbows.
  • •Flaring the elbows wide instead of keeping the upper arms fixed toward the head.
  • •Setting the incline too steep so the long-head tension advantage is lost.
  • •Dropping the dumbbells fast rather than controlling the eccentric beside the head.

Variations & alternatives

  • •Incline barbell skull crusher, the same angle with a fixed bar.
  • •Flat dumbbell skull crusher, a shallower stretch on a flat bench.
  • •Overhead dumbbell extension, a standing long-head stretch movement.
  • •Overhead cable extension, constant tension on the stretched long head.
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Programming: sets, reps & when to use it

Program the incline dumbbell skull crusher in the library’s 10–15 rep range as a stretch-focused triceps accessory for the long head. The neutral grip suits slightly higher reps than a barbell version; control the lowering into the stretch and keep the elbows tucked. Run it after pressing and let the weaker arm set the load.

Frequently asked questions

What does the incline add over a flat dumbbell skull crusher?

The incline angles your upper arms further back behind your head, deepening the stretch on the long head of the triceps at the bottom. It shifts more of the work into the stretched range while the neutral dumbbell grip keeps it easy on the joints.

Why use dumbbells instead of a bar here?

Independent dumbbells let each arm move in a neutral grip, which eases wrist and elbow strain in the deep stretch and evens out side-to-side imbalances. A bar is easier to load heavier, but the dumbbells are usually kinder to the elbows.

Use this exercise in a program

The Incline Dumbbell Skull Crusher fits naturally into hypertrophy and strength splits that prioritize triceps volume.

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