Overhead tricep extension: the form, the versions, and what the long-head trial found

An overhead tricep extension straightens your elbows with your upper arms pointing at the ceiling, so the weight travels from behind your head to above it. Only the elbow moves, so the work goes to the triceps, the muscle on the back of the upper arm. One of its three heads, the long head, also crosses the shoulder, and it's stretched more with the arm overhead than with the arm at your side.¹

This page covers the form, the dumbbell, cable and bar versions, what the studies found, the faults and the sets. The same extension with your arms at your sides is the tricep pushdown, and how much triceps work your week needs next to your presses is on the arm workout.

How to do an overhead tricep extension

The steps are practical cues; where a study set a detail, it's cited.

1. Sit on a bench with a back, or stand tall, holding one dumbbell in both hands by the top plate, or a rope on a cable set low behind you.
2. Press the weight overhead so your upper arms point up, close to your head.
3. Bend only at the elbows to lower the weight behind your head. The 12-week trial below worked from a right angle at the elbow to straight arms.¹
4. Straighten your elbows without letting your upper arms drift forward, then lower again under control.

Overhead or arm at your side: the 12-week trial

In 21 adults, one arm did cable triceps extensions overhead and the other did them with the arm down at the side, twice a week for 12 weeks, at 70% of each arm's one-rep max for 5 sets of 10. Muscle size was measured by MRI before and after:¹

The overhead arm grew more even though it always lifted lighter weights, 34% to 39% less. Strength in each arm's own exercise rose by a similar amount in both.¹ Read it both ways: the arm at the side grew too, so a pushdown still counts. It was one trial of 21 adults using a cable, not a rule for every triceps exercise.

What the muscle-activity studies found

Studies that put sensors on the skin (EMG) during a few reps measure activity, not growth, and one of them points the other way from the trial:

• With the arm at the side, the long head did the most work. In 10 healthy adults (8 men and 2 women) straightening the elbow with the arm at five angles, from down at the side to straight overhead, the long head produced more force and activity than the other two heads with the arm down at the side. With the arm at 90 degrees or higher, the medial head produced the most force, estimated with a computer model of the same movements, and at 90 and 180 degrees the sensors showed it the most active too. The long head's own activity was spread evenly across every arm angle.² The authors name their small group as the main limit.
• It overlaps with skull crushers. In 21 resistance-trained men, the overhead dumbbell extension and the lying dumbbell extension showed similar triceps activity patterns, and the authors advised against putting both in the same routine.³ The lying version is the skull crusher.
• The first two thirds of the lift drew the most activity. In the same men, the long and lateral heads were more active in the first and middle thirds of the overhead lift than in the last third, and less active while lowering than while lifting.³

So the activity data and the growth data don't line up: in the activity study the long head did the most work with the arm down, yet in the trial it grew more in the overhead arm. The trial measured growth over weeks; the activity studies measured a few reps.

Dumbbell, cable, bar or one arm

No study comparing these versions with each other was found for this page. As practical advice, not a finding:

• One dumbbell, two hands is the version a home gym can do. Hold it by the top plate with your palms flat against it.
• A cable with a rope, facing away from a low pulley, is the version the trial used.¹
• An angled curl bar lets you load both arms together with your wrists turned in a little.
• One arm at a time with a light dumbbell or a single cable handle lets your weaker arm set the pace.
• Seated or standing: sitting against a bench back stops your lower back arching to help; standing is fine with light weights.

The common faults, and a fix for each

These fixes are practical cues, not findings.

• Elbows flaring wide. Keep your upper arms close to your head and pointing up; if they drift out, the weight is too heavy.
• The upper arms swinging forward. That turns the rep into a pullover. Only the forearms move.
• Arching the lower back. Brace your stomach, or sit down against a bench back.
• Cutting the bottom short. Lower to at least a right angle at the elbow, the range the trial used.¹
• Pushing through pain. If you have pain, an injury or a medical condition, stop and ask a doctor or a physical therapist.

Sets, reps and where it goes

• What the trial used: 5 sets of 10 at 70% of a one-rep max, twice a week for 12 weeks, adding 5% of the one-rep max after a session finished without a failed rep.¹
• As a practical start: 2 or 3 sets of 8 to 15, one to three reps short of failure, after your presses. (How to judge reps left.) This is practical advice, not a finding.
• Count it with your presses. The bench press, push-ups and dips already work your triceps; the arm workout shows how to count them.
• Add weight in small steps. When the top of your rep range comes easy, go up by the smallest jump you have. (Progressive overload covers the options.)

Common questions

Overhead extension or pushdown?

If you only have room for one, the overhead arm grew more in the one trial that compared them, in 21 adults over 12 weeks; the arm at the side still grew.¹ The pushdown page has the case for keeping both.

Overhead extension or skull crushers?

Pick one at a time. The two showed similar activity patterns in 21 resistance-trained men, and the authors advised against doing both in the same routine.³ The overhead extension is the one with the growth trial behind it.¹

Dumbbell or cable?

The trial used a cable;¹ no study comparing it with a dumbbell was found for this page. Use the one you can add weight to in small steps.

One arm or two?

No study comparing them was found for this page. Both are the same movement; one arm at a time takes longer.

If you'd rather not plan it alone

The extension is easy to learn; deciding how much triceps work your week needs next to your bench and your presses, and when to change it, is the part a page can't do. Coaching is the version where your workouts live in Trainerize, built around the days you actually have, and a weekly call looks at the week you just had and rebuilds the next one. Coaching to build muscle explains how that works, and here's how to apply. Otherwise: at your next upper-body session, add two sets of 12 overhead extensions after your presses and write down the weight.