How to do Lying Triceps Extension (Skull Crushers)

Read time : 1.5 minutes

Overview

  • Calories Burned: ~0.15 kcal per rep
  • Recommended Time for Each Rep (Correct Form): 2.1 seconds
  • Repetitions: 10
  • Position: Lying on a mat/bench
  • Difficulty Level: Medium

Body Parts Targeted

How to do Lying Triceps Extension (Skull Crushers)

Triceps (main focus), Shoulders (stabilization)

Description

Also known as Skull Crushers, this classic strength-building exercise focuses on isolating and developing the triceps on the back of your upper arms. Done with a barbell or dumbbells, it’s commonly used in bodybuilding, strength, and toning programs.

Common Mistake:

  • Allowing elbows to flare outward.
  • Dropping weights too low — risking injury.
  • Choosing excessive weight, causing form breakdown.

Instructions

  • Start: Lie on a mat or bench holding a dumbbell or barbell, grip slightly wider than shoulder-width.
  • Arms Up: Extend arms straight above your chest, palms facing inward, elbows extended.
  • Lower the Weight: Bend your elbows ONLY to bring the weight down toward your forehead.
  • Bottom Position: Pause just before the weight touches your forehead or head.
  • Lift Again: Push the weights back up by straightening your elbows to the original position.

Tips:

  • Engage your core and keep your back flat on the mat.
  • Control the descent; don’t rush.
  • Use moderate weights to focus on form before adding resistance.

Rest Instruction:

  • Take a break

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