Triceps

Triceps: what are they?

The lateral and medial heads start on the humerus; the long head starts on the scapula, just below the shoulder socket. All three merge into one tendon on the olecranon, the point of the elbow. Because the long head crosses two joints, it is the only part of the triceps whose length changes with shoulder position, and it is also the largest of the three. That single anatomical fact is the reason a triceps program needs an overhead movement rather than three variations of a pushdown, and it is the point most clients have never been told.

What the triceps do

Elbow extension is the shared action of all three heads, which is why they work in every press: bench press, overhead press, dip, push-up. In heavy pressing the triceps often determine the lockout, which is why close-grip work is a standard accessory for a stalling bench press.

The long head adds shoulder extension and adduction, pulling the arm backwards and towards the body. It also contributes to shoulder stability. Practically, this means that when the arm is raised overhead the long head is stretched, and it is loaded hardest in that position, which no pushdown reproduces.

How to train the triceps

The useful split is by shoulder position rather than by equipment. One overhead movement to load the long head at length, one movement with the arm at the side, and one heavy compound press covers the muscle properly.

Why pushdowns alone leave size on the table

A pushdown holds the shoulder at the side, so the long head never reaches a stretched position. It is the largest of the three heads, and training it only in a shortened range means a large part of the muscle is trained under conditions it responds to least. Adding one overhead extension per week is the single most reliable change to a stalled triceps program.

Elbow tolerance is the practical limit. Overhead extensions load the elbow in a demanding position, and clients with elbow discomfort often need to start with cables rather than a bar, keep the reps in the 12 to 15 range, and progress load slowly. Cable overhead extensions are usually the most tolerable entry point.

What goes wrong in practice

The first pattern is a pushdown where the elbows travel. If the elbows drift forward and back, the lats and shoulders are contributing and the triceps get less of the work. Pinning the upper arm against the ribs, or using a slightly lighter load, fixes it.

The second is treating skullcrushers as the only overhead option. They work, but they load the elbow at a sharp angle and many clients cannot tolerate them for long. A cable overhead extension gives the same stretched position with a friendlier resistance profile.

The third is stacking triceps work on top of already-high pressing volume. A client benching twice a week with dips and close-grip work is already giving the triceps plenty. Four to eight direct sets a week on top of that is usually enough, and adding more tends to cost pressing quality rather than adding size.