Back to library

Exercise Library

Skull Crusher

A lying triceps isolation that loads elbow extension under stretch, emphasizing the long head of the triceps.

ArmsBarbellElbow extension
GoLightWeight mediaskull-crusher

Demonstration coming soon

Watch on YouTube

Primary

Triceps

Secondary

ForearmsAnconeus

Equipment

Barbell

Pattern

Elbow extension

Setup

  1. 01Lie on a flat bench holding an EZ or straight bar.
  2. 02Press the bar up so the arms are extended over the chest.
  3. 03Tilt the upper arms slightly back so they stay fixed during the lift.
  4. 04Set a shoulder-width grip and keep the wrists stacked.

Execution

  1. 01Bend the elbows to lower the bar toward the forehead.
  2. 02Keep the upper arms fixed while only the forearms move.
  3. 03Lower until the triceps are stretched without flaring the elbows.
  4. 04Extend the elbows to press the bar back to the start.

Checkpoints

  • -Upper arms stay angled and do not drift toward the hips.
  • -Elbows track in line rather than flaring wide.
  • -The bar lowers to the forehead or just behind the head.
  • -Lockout comes from the triceps, not a shoulder press.

Common mistakes

  • -Letting the upper arms swing to turn it into a press.
  • -Flaring the elbows out under load.
  • -Using a heavy bar that breaks wrist or elbow position.
  • -Cutting the range short and skipping the stretch.

Programming notes

  • -Use 3 to 4 sets of 8 to 15 reps.
  • -An EZ bar eases wrist strain compared with a straight bar.
  • -Pair with pushdowns or pressing work for full triceps coverage.

Related exercises

Almost there

Coming soon to iOS & Android

GoLightWeight is in the final stretch. Free to download, no account required to start.

Coming soonApp Store
Coming soonGoogle Play