Dumbbell Skull Crusher
ట్రైసెప్స్
What moves the load, and what it costs
3.5MET
Triceps is the prime mover. Dumbbells let the wrists and elbows find their own path, which many people find kinder than a bar on this movement.
Cue: Keep the palms facing each other and lower the dumbbells beside the ears.
మూలం·2024 Adult Compendium of Physical Activities·FILED UNDER WEIGHTS, 8–15 REPS·జూలై 2026న సమీక్షించాం
SHARED AXIS · SEVEN VALUES FROM ONE TABLE · HIGHLIGHTED ROW IS THIS MOVEMENT
The compendium files dumbbell skull crusher under a category, not a lift. Read the ladder as position, not precision: this is heavier work than sitting quietly by a factor of 3.5, and middling for conditioning work.
Turning that MET value into a real energy cost
- Map the movement to a published category. The compendium measures categories of conditioning work, never individual lifts, so dumbbell skull crusher is filed under Resistance training (weight lifting), multiple exercises, 8–15 repetitions at varied resistance.
- Take the category's MET value — 3.5. One MET is the cost of sitting quietly, so this is 3.5 times resting metabolism.
- Multiply by 3.5 to get millilitres of oxygen per kilogram per minute, the unit the MET is actually defined in.
- Multiply by your bodyweight in kilograms and divide by 200. The result is kilocalories per minute of work.
- Count working minutes only. Under load, not under the roof — a set of eight is about 25 seconds of the hour you were there.
kcal/min = MET × 3.5 × body mass (kg) ÷ 200 Dumbbell Skull Crusher: 3.5 × 3.5 × 70 ÷ 200 = 4.29 kcal/min
మూలం·ACSM metabolic equation + 2024 Adult Compendium of Physical Activities·REFERENCE BODY MASS 70 KG·జూలై 2026న సమీక్షించాం
What is actually doing the work
| Muscle | Role | What it does here |
|---|---|---|
| TricepsTriceps brachii | Prime mover | Straightens the elbow. The long head also crosses the shoulder, so it is stretched and loaded hardest with the arm overhead. |
The prime mover produces the movement against the resistance; synergists assist and stabilisers hold a joint still without moving it. An exercise trains the whole muscle it loads — there is no way to work only part of a muscle, and no exercise removes fat from the area around it.
Set up, then earn the rep
Dumbbells, Bench. Every rep should look like the first one. The moment it stops looking like the first one, the set is finished.
PATTERN · ISOLATION
- Take the dumbbells and set the upper arms in position — overhead, vertical, or angled back depending on the variation — with the elbows tucked in.
- Brace the trunk and keep the ribs down so the lower back does not arch.
- Keep the palms facing each other and lower the dumbbells beside the ears.
- Bend the elbows to lower the load until you feel a strong stretch through the back of the arm.
- Straighten the elbows back to the start without letting the upper arms move.
- Lock out gently rather than snapping into the finish.
Where this one breaks down
Not theory. These are the faults you correct on a gym floor, and the correction that actually works.
Letting the elbows drift and flare.
The upper arms are the fixed part. If they move, the shoulders and chest start helping and the triceps get less.
Going heavy on an overhead version.
The long head is at its longest and weakest overhead. Choose the load for the stretched position, not the lockout.
Snapping into lockout.
Elbows do not enjoy being slammed straight under load. Finish under control.
Regress it, or progress it
Regress — earn it first
Progress — the next demand
Prescription: load, reps, rest
Read off the goal, then hold the technique constant as the load climbs. Derived from the movement's mechanics, not invented for this page: a single-joint movement does its best work in moderate to high reps — very low reps load the joint before the muscle.
| Goal | Sets | Reps | Rest | Notes |
|---|---|---|---|---|
| Strength | 3–4 | 6–10 | 2 min | Single-joint work responds poorly to very low reps — the joint gets the load before the muscle does. |
| Muscle size | 3–4 | 10–15 | 60–90 sec | This is where isolation work earns its place: cheap volume for one muscle, little systemic fatigue. |
| Endurance / fat loss | 2–3 | 15–25 | 30–45 sec | High reps here are genuinely useful — the load is small enough that form survives the fatigue. |
| First month | 2 | 12–15 | 60 సెక | Light. Isolation work is for adding volume later, not for building a base. |
Time under load, in kilocalories
Read these as minutes of work, not minutes in the building. A set of eight takes about twenty-five seconds; the rest of the hour is rest, chalk and queueing.
Mapped category: Resistance training (weight lifting), multiple exercises, 8–15 repetitions at varied resistance — 3.5 MET. That is the published category this movement is filed under, not a measurement of this specific lift.
Worked at 3.5 MET × 3.5 × 70 kg ÷ 200 = 4.29 kcal per working minute for a 70 kg adult. Scale it by your own bodyweight; the equation is linear. The full activity dataset lives at BurnLab.
మూలం·2024 Adult Compendium of Physical Activities·CATEGORY VALUE, NOT A PER-EXERCISE MEASUREMENT·జూలై 2026న సమీక్షించాం
If the rack is taken
Substitutes train the same prime mover through the same pattern with different kit. Computed from the muscle and pattern data on this card, not hand-picked to fill a grid.
చేతిలో ఏమీ లేకపోతే: Close-Grip Push-Up అత్యంత దగ్గరి ప్రత్యామ్నాయం — అదే ప్రధాన కండరం, అదే పద్ధతి, ఎలాంటి పరికరాలు అవసరం లేదు.
Where it sits in a week
One movement is not a programme. The twelve templates put these in order, including 6 that need no gym at all.
The questions that come up on the floor
What muscles does the dumbbell skull crusher work?
Dumbbell Skull Crusher is a single-joint isolation movement in which the triceps is the prime mover. Straightens the elbow. The long head also crosses the shoulder, so it is stretched and loaded hardest with the arm overhead.
Is the dumbbell skull crusher good for beginners?
Yes. It rates 2 out of 5 for technical difficulty on this site — learnable in a session or two; low injury cost if it goes wrong. Start with the lightest sensible load and two or three sets of 12–15.
What can I do instead of the dumbbell skull crusher at home?
The closest no-equipment substitute is the close-grip push-up, which trains the same prime mover through the same movement pattern. It will not load you as heavily, so use higher reps and slower tempo to make up the difference.
How many sets and reps of the dumbbell skull crusher should I do?
For muscle size, 3–4 sets of 10–15 with 60–90 sec rest. For strength, 3–4 sets of 6–10 with 2 min rest. In your first month, 2 sets of 12–15, stopping well short of failure. Total weekly hard sets per muscle group matters more than the exact rep number in any of these ranges.
Does the dumbbell skull crusher burn fat from the triceps?
No. No exercise removes fat from the area it trains — spot reduction has been tested repeatedly and does not happen. Training the triceps builds the muscle underneath; where body fat is lost from is decided by an overall calorie deficit and by your genetics, not by which exercise you chose.
Muscle roles follow standard kinesiology references and are described by joint action rather than by gym convention — see how this site is built. Energy figures are derived from the 2024 Adult Compendium of Physical Activities. Every reference is named and dated on the sources page. General information only — not medical or coaching advice. Load, form and progression should be adjusted to your own experience and any injury history. When in doubt, get coached in person.
మూలం·Published exercise references·MUSCLE ROLES ASSIGNED BY JOINT ACTION·జూలై 2026న సమీక్షించాం
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