Home Exercises Triceps Dumbbell Skull Crusher
Dumbbell Skull Crusher

Dumbbell Skull Crusher

Triceps DumbbellsFull Gym
Primary musclesTriceps
EquipmentDumbbells، Full Gym
Level—
Suggested3 × 8–12

Overview

Dumbbell Skull Crusher, also known as the lying triceps extension, is a strength exercise that targets the triceps through elbow extension while you lie on a flat bench. Compared with barbell versions, dumbbells let you move through a larger range of motion, ease wrist stress, and support better muscle balance. Lifters often use this move to build bigger arms, sharper definition, and stronger pressing power.

How to do it

  1. 1

    Setup and Starting Position

    • Lie on a bench with both feet flat on the floor.
    • Grip a dumbbell in each hand with an overhand grip, and hold your arms straight above your chest.
    • Fix your elbows in place and limit shoulder movement.
  2. 2

    Execution

    • Bend at the elbows and lower the dumbbells slowly toward your forehead.
    • Keep your upper arms still so only your forearms move.
    • Pause briefly when the dumbbells are just above your forehead.
    • Press the dumbbells back to the start, fully extending your elbows.
    • Perform 8 to 12 reps for 3 to 4 sets.

Form tips & common mistakes

Keep your elbows stable

do not let them flare outward.

Lower the dumbbells in a controlled manner

to avoid unnecessary strain.

Use a comfortable weight

so you can keep proper form from start to finish.

Avoid locking out your elbows

at the top to lower joint stress.

Engage your core

to stay steady on the bench.

Benefits

Builds Triceps Strength and Size: Skull crushers isolate the triceps well, which helps create stronger, more defined arms. You can use this exercise in your workouts to tighten flabby arms and tone your arm muscles.

Improves Lockout Strength: Triceps strength supports more powerful pressing in exercises such as bench presses and overhead presses.

Enhances Muscle Symmetry: Dumbbells make each arm work on its own, which helps reduce muscle imbalances.

Versatile and Joint-Friendly: A neutral grip with dumbbells can reduce stress on the wrists and elbows, making this a joint-friendly exercise.

Great for Strength Training and Hypertrophy: This exercise works well for both muscle growth (hypertrophy) and strength development, depending on reps and load.

Muscles worked

Target

Triceps

Muscles worked — Dumbbell Skull Crusher

Alternatives & variations

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