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Single Hand Triceps Dumbbell Extension

The single-hand overhead dumbbell extension raises one arm overhead and lowers the dumbbell behind the head by bending the elbow, then extends it back up. The overhead position works the triceps at its longest — the stretch-loaded state that makes this movement a favorite for building the back of the arm. Coached by Maddy (NASM-CPT) — these are the exact form cues he gives on every client's first week.

Muscles worked

Triceps · triceps brachii Anconeus

Sets & reps by goal

GoalSets × RepsRest
Strength4 × 4–6 per arm2–3 min
Muscle3–4 × 9–12 per arm60–90 s
Endurance3 × 18–27 per arm45–60 s

Rep ranges per Helms 2014 · Schoenfeld 2016.

Level — Beginner

Beginner movement, but the overhead position quietly tests shoulder mobility — seated with back support is the easiest entry.

Proper form — 5 cues

  1. Press one dumbbell overhead, arm straight, biceps beside the ear
  2. Lower the weight behind the head by bending only the elbow
  3. Descend until the forearm touches the biceps or the stretch peaks
  4. Drive the dumbbell back up to a full, quiet lockout
  5. Support the working arm's elbow with the free hand if it drifts wide

Breathing: Inhale lowering the dumbbell behind the head, exhale driving to lockout.

The 3 mistakes Maddy corrects most

Elbow flaring out to the side. A winged elbow shortens the triceps' stretch and turns the extension into an awkward part-press. Fix: Keep the elbow pointing at the ceiling and brushing your head throughout — use the free hand as a guide.
Arching the lower back under the overhead load. A tight overhead position exposes weak trunk bracing; the arch shifts strain into the lumbar spine. Fix: Tuck the ribs down, squeeze the glutes, or perform the movement seated with back support.
Cutting the descent to half depth. The bottom stretch is the very feature that separates overhead work from pushdowns; a shallow rep discards it. Fix: Lower on a slow count until the forearm folds fully, using a lighter dumbbell if the stretch feels abrupt.

Common questions

What makes overhead triceps extensions different from pushdowns?

Position of the upper arm. Overhead, the long head of the triceps — the biggest portion of the muscle — starts in a stretched state, so the exercise loads it through a range pushdowns never reach. Pairing one overhead movement with one pushdown covers the triceps far better than doubling either.

Can beginners do single-arm overhead extensions?

Yes, with a genuinely light dumbbell — 2 to 5 kg is a fair start. The exercise asks for shoulder mobility to hold the arm beside the ear and trunk control to avoid arching, so learn it seated with back support first. Progress the weight only when the elbow stays narrow.

My elbow clicks during overhead extensions — should I worry?

Painless clicking is common as the triceps tendon glides at the elbow with the arm overhead, and it usually settles as the area warms up. Slow the lowering phase and warm up with a light set first. Clicking that comes with pain or swelling is different — get that assessed before loading it.

Related exercises

Close Grip Dumbbell Bench PressTriceps · Mid & lower chest Overhead Cable Triceps ExtensionTriceps Overhead Triceps ExtensionTriceps Reverse Grip Triceps PushdownTriceps Rope PushdownTriceps

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