The overhead tricep extension is the go-to isolation move for the long head of the triceps — the part that gives the arm its thickness. Here's how to do it with good form, the muscles it works, the mistakes to avoid, and how to program it.
The overhead tricep extension is an isolation exercise that works the triceps, and because the arms are raised overhead it biases the long head through a big stretch. You hold a dumbbell or cable overhead, lower it behind your head with the elbows tucked, then extend to straighten the arms. Training the triceps in that lengthened position adds a stretch stimulus that arm-down pushdowns don't emphasize as much, which makes it a strong complement to pressing and pushdown work for fuller, stronger arms.
This is a triceps isolation move. All three heads extend the elbow, but the overhead position stretches the long head — which also crosses the shoulder — so it takes on more of the emphasis.
| Role | Muscles | What they do in the lift |
|---|---|---|
| Primary mover | Triceps long head | Extends the elbow from a deep stretch overhead |
| Assisting | Lateral & medial heads | Help straighten the elbow to lock out the arm |
| Stabilizers | Core / abdominals | Keep the ribs down and lower back neutral under the overhead load |
| Stabilizers | Shoulders, forearms | Keep the upper arms fixed and the weight controlled |
Step-by-step form for the dumbbell or cable overhead tricep extension. If you're new, start light and keep the elbows tucked.
If you want to train the triceps with a different emphasis or equipment, these are the common swaps:
The overhead extension is an arm accessory that fits on push, upper-body or arm days. General starting points:
| Goal | Sets × reps | Notes |
|---|---|---|
| Muscle size | 3–4 × 8–15 | Controlled tempo, full stretch each rep, train close to failure |
| Higher-rep pump | 2–3 × 12–20 | Lighter load, constant tension (cable works well), short rest |
| Frequency | 2–3× / week | Small muscle that recovers fast; pair with pressing days |
The overhead extension pairs well with the skullcrusher and the tricep pushdown to hit every head of the triceps. To understand where isolation like this fits alongside big lifts, read up on compound vs isolation.
Log every overhead extension set — weight and reps — in LiftHero, and it charts your progressive overload and flags personal records so you can watch your triceps get stronger over the weeks. You can superset extensions with pressing, add rest-timer holds, and save your arm work as a routine so it's ready next time. LiftHero records what you log; it doesn't diagnose your form.
It isolates the triceps, and because the arms are overhead it puts the long head on a big stretch. That stretched position biases the long head more than pushdowns do, while the lateral and medial heads still assist in extending the elbow.
The long head of the triceps crosses the shoulder, so raising the arm overhead lengthens it. Training it in that stretched position adds a stimulus that arm-down pushdowns don't emphasize as much. Many lifters do both for complete development.
Both work well. A cable keeps constant tension through the whole range, including at the top; a single dumbbell is simple and loads the stretch hard. An EZ-bar is another option. Pick what feels best on your elbows and shoulders.
Not inherently, but the deep stretch can bother sensitive elbows if you go too heavy or lose control. Use a manageable weight, keep the reps smooth, and reduce the range if you feel joint pain rather than muscle stretch.
As an isolation move, moderate to higher reps work well — commonly about 8–15 reps for 2–4 sets. Keep the load controlled so you feel the triceps stretch and contract rather than heaving the weight.
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This guide is educational and not medical advice. Consult a qualified coach or medical professional before starting or changing a training program, especially if you're new to lifting or returning from injury.
By Meitar Lazimi, founder of LiftHero · Last updated July 9, 2026.