Dumbbell Skull Crusher
Dumbbells let the wrists find a neutral path that spares the elbows.
Setup
- Lie on a bench, dumbbells over the chest, palms facing each other.
- Elbows pointing at the ceiling.
How To Do It
- Lower the bells beside the ears by bending only at the elbows.
- Feel the stretch, then extend back to the start.
- Keep the upper arms vertical throughout.
Breathing
Inhale down, exhale up.
Common Mistakes
- Letting the upper arms drift back and turning it into a pullover.
- Flaring the elbows wide.
Programming It
| Goal | Sets | Reps | Rest |
|---|---|---|---|
| Strength | 3–5 | 4–6 | 2–3+ min |
| Muscle | 3–4 | 8–12 | 60–90 sec |
| Endurance / Conditioning | 2–3 | 15–20 | 30–45 sec |
Why This Exercise Works
The triceps are roughly two-thirds of upper arm mass, and extension under stretch loads the long head.
Where It Fits in a Program
Dumbbells let the wrists find a neutral path that spares the elbows. Train it when you are fresh enough to execute it well — compound work early in a session, isolation and accessory work after. You should have a working base in the underlying pattern before loading this heavily. Add weight only when the current load is genuinely comfortable for all prescribed reps.
Progressing and Regressing It
To progress the dumbbell skull crusher: move up one increment, or slow the lowering to four seconds. To regress it: drop one increment and add two reps. Change one variable at a time.
Equipment and Substitutions
This version uses dumbbells and a bench. If that is unavailable, choose another exercise training the same muscles from the list below — the pattern matters more than the specific implement.
Related Exercises
- Skull Crusher — Triceps
- Triceps Kickback — Triceps
- Overhead Cable Triceps Extension — Triceps
- Seated French Press — Triceps
- Triceps Pushdown — Triceps
- JM Press — Triceps
- Overhead Triceps Extension — Triceps (Long Head)
- Diamond Push-Up — Triceps, Chest
Common Questions
What muscles does the dumbbell skull crusher work?
The barbell back squat primarily trains the legs, glutes, core. The listed muscles are highlighted in the animation above so you can see which tissue is producing the movement rather than guessing from the exercise name.
How many sets and reps should I do?
The dumbbell skull crusher is accessory work for the triceps, so it goes after your compounds. Three to four sets of ten to fifteen reps, sixty to ninety seconds rest.
What are the most common dumbbell skull crusher mistakes?
On the barbell back squat, the usual faults are letting the tempo run away on the lowering phase, loading beyond what the legs, glutes, core can control, and cutting the range short at the hardest point of the rep.
Do I need dumbbells and a bench to do this?
This version uses dumbbells and a bench. If you don't have that, use another exercise that trains the triceps through a similar range — the muscles and the movement pattern matter more than the specific piece of equipment.
Is this safe if I have an existing injury?
The dumbbell skull crusher loads the shoulder and elbow directly, so an existing problem there is the one to watch. If a rep reproduces your pain rather than normal training discomfort, stop and get it assessed. This is general fitness information, not medical advice.
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Form guide for educational purposes — not medical advice. New to training or working around an issue? Apply for coaching and get a plan built for your body.