Learn why one triceps head changes length at the shoulder, then combine overhead, bodyweight-extension, and close-grip pressing patterns.
Long head — From just under the socket on the shoulder blade, down the inner back of the upper arm. The only head that crosses the shoulder.
Lateral head — High on the outer back of the arm bone — the flat plane you can see on the outside of a straightened arm.
Medial head — Deepest of the three, low on the back of the arm bone, showing just above the elbow.
Straightens the elbow
Hold one arm bent in front of you and try to straighten it while your other hand blocks it. The horseshoe that hardens on the back of the upper arm is all three heads pulling on one shared tendon.
Pulls the upper arm backward
Keep an arm straight at your side and press it back into a wall behind you. The tension high on the back of the arm, near the armpit, is the long head — the elbow never moved.
Holds the elbow straight under weight
Sitting, push down through both hands to lift your weight off the seat. The back of the arms firms with nothing moving; that is the same muscle keeping a joint from folding.
Frequently asked questions
Do push-ups train the triceps?
Yes — every push-up has to finish by straightening the elbow, and that is the triceps whatever else is happening. Bringing the hands closer raises its share of the work, but it does not isolate anything: the chest and front deltoid are still pressing, and the hands do not need to touch. If you press at all, the triceps is trained. Direct work is for adding a position pressing cannot reach.
Why train the triceps overhead?
The long head is the only head crossing the shoulder, so raising the arm lengthens it before the elbow bends at all. A within-person trial found substantially greater triceps growth from overhead extensions than from the same work with the arm at the side, despite lower loads.[1] It is a length story, not a targeting trick: force measurements show the long head’s share is largest with the arm low, while the medial head contributes most once the shoulder is at ninety degrees or above.[2]
Must my elbows stay tucked during a triceps extension?
No — use a path your shoulder likes. All three heads pull on the same tendon, so a few degrees of flare does not reassign the work between them. Wide flare matters for a different reason: it lets the shoulder take over the movement, and it makes a loaded bag harder to control above your head. If the overhead position gives you shoulder pain or numb hands, the countertop or close-grip version trains the same elbow extension.
Do I need both overhead and pressing triceps work?
No. Pair one overhead path with one pressing or bodyweight-extension path and you have covered both the lengthened long head and the whole group in a strong compound task. What matters is that straightening the elbow stays the thing that limits the set — not the grip, not the shoulder, and not a bag that is wobbling.
One common mistake
• Choosing a load that forces the elbows wide and the ribs forward.
• In an overhead extension, that often changes a controlled elbow action into a backbend with an unstable bag.
• Use a secure grip and a range in which the upper arms and trunk remain predictably organized.
What's normal
A tight, filling ache along the back of the upper arm, usually strongest nearest the elbow, that builds through a set and fades within a day or two. Straightening the arm the next day can feel stiff before it feels sore.
How sore is normal? →Stop if you notice
Sharp pain at the bony point of the elbow, swelling there, or a pop during a forceful push, especially with sudden difficulty straightening the arm afterwards. Numbness or pins and needles running into the ring and little fingers.
These guides are general information, not medical advice. Stop for sharp or persistent pain, and consult a qualified professional before beginning any exercise program.