Tricep Extension: how to do it for bigger triceps
The tricep extension is an isolation exercise that straightens the elbow against resistance to work the triceps — and it's most effective overhead, where the long head is stretched.
How to do the tricep extension
Using the overhead cable version:
- Set a rope on a high or low pulley; face away from the cable with a staggered stance.
- Hold the rope behind your head, upper arms next to your ears, elbows pointing forward.
- Brace your core and keep the upper arms still.
- Extend your forearms overhead until your arms are straight but not locked.
- Squeeze the triceps at the top, then lower under control to a full stretch behind the head.
Only the forearms move — keep the elbows from flaring out.
Sets and reps
An isolation move: go light to moderate and chase the stretch, not the load.
| Goal | Sets | Reps |
|---|---|---|
| Strength | 3 | 8–10 |
| Hypertrophy | 3–4 | 10–15 |
| Endurance | 2–3 | 15–20 |
Muscles worked
Primary — the triceps brachii, with the long head emphasised because the overhead position stretches it (the long head crosses the shoulder joint).
Secondary — the shoulders and core work to stabilise the position.
Common mistakes
- Flaring the elbows — keep them tucked by your ears; flaring shifts load off the triceps.
- Moving the upper arm — only the forearm should travel through the rep.
- Going too heavy — you'll lose range and form.
- Arching the lower back when standing — brace the core to keep a neutral spine.
Variations and alternatives
- Overhead dumbbell extension, single-arm cable, and banded versions.
- The skull crusher is the lying cousin of this movement — same long-head bias, different angle.
For where it fits in a full session, see the triceps workout guide, which pairs overhead work with heavy pressing and pushdowns.
Common questions
What muscles do tricep extensions work?
The triceps brachii. Overhead versions emphasise the long head, which crosses the shoulder and is stretched when the arms are raised.
Is the overhead tricep extension better than pushdowns?
They're complementary — overhead work biases the long head via the stretch, while pushdowns hit the lateral head. Doing both covers the triceps better than either alone.
Should I do tricep extensions seated or standing?
Seated reduces lower-back strain and keeps form stricter; standing engages the core more. Both work — pick what feels stable.
How heavy should I go?
Light to moderate. It's an isolation move, so prioritise a full stretch and controlled reps over load.
Setting weights for your heavy pressing? Work back from a recent hard set — estimate your max without testing one, or use the 1RM calculator.