Exercise guide
Kettlebell Lying Triceps Extension Skull Crusher
- Intermediate
- Isolation
- Rep-based
- Chest
- Upper arms
This isolation exercise targets all three heads of the triceps, using the kettlebell's unique center of gravity to provide constant tension and a deep stretch. It is highly effective for building lockout strength and improving elbow stability.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Lie flat on a bench with your feet planted firmly on the floor for stability.
- Hold a kettlebell in each hand using a neutral grip (palms facing each other) with arms extended directly over your shoulders.
- Position the kettlebells so the bell portion is resting against the back of your forearms.
- Retract your shoulder blades into the bench to create a stable base.
How to do it
- Inhale as you slowly bend your elbows to lower the kettlebells toward the sides of your forehead or ears.
- Keep your upper arms stationary and perpendicular to the floor throughout the descent.
- Exhale as you contract your triceps to extend your arms back to the starting position.
- Maintain a controlled tempo, focusing on a 2-second eccentric (lowering) phase and a 1-second squeeze at the top.
Form checklist
- Keep your elbows tucked in and pointing forward; do not let them flare out.
- Ensure the movement occurs exclusively at the elbow joint; keep the shoulders still.
- Maintain a neutral wrist position to avoid strain from the kettlebell's weight.
- Keep your lower back pressed against the bench to prevent arching.
Pro tips
- Angle your upper arms slightly back toward your head (about 10-15 degrees) to keep the triceps under tension even at the top of the rep.
- Focus on the 'stretch' at the bottom of the movement to maximize recruitment of the long head of the triceps.
Make it harder
- Perform the movement on a slight decline bench to increase the range of motion and stretch.
- Add a 3-second pause at the bottom of each rep to eliminate momentum and increase time under tension.
Frequently asked
- What muscles does the kettlebell lying triceps extension skull crusher work?
- The kettlebell lying triceps extension skull crusher primarily targets the triceps, and also works the abs and obliques as secondary muscles.
- What equipment do you need for the kettlebell lying triceps extension skull crusher?
- The kettlebell lying triceps extension skull crusher uses kettlebell.
- Is the kettlebell lying triceps extension skull crusher good for beginners?
- The kettlebell lying triceps extension skull crusher is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.