Triceps: Length-Tension & Targeted Training

1. Triceps Anatomy: The Three-Headed Extensor

As its name implies, the triceps brachii is composed of three distinct heads, all of which share a common insertion point on the olecranon process of the ulna (the bony point of your elbow). Their primary shared function is elbow extension. However, their origins are different, which is the key to targeting them effectively.

Let's break down the anatomy, which is crucial for the rest of this lesson.

As you just read, the critical distinction is:

• Long Head: Originates on the scapula (shoulder blade). Because it crosses both the shoulder and elbow joints, it is bi-articular.
• Lateral & Medial Heads: Originate on the humerus (upper arm bone). Because they only cross the elbow joint, they are uni-articular.

This simple anatomical fact dictates our entire exercise selection strategy.

2. Lengthened vs. Shortened Positions: The Role of the Shoulder

Just as with the biceps, the length of the triceps long head is determined by the position of both the shoulder and the elbow.

Triceps Long Head

• Lengthened Position: To stretch the long head, we must move its origin (on the scapula) and insertion (on the ulna) further apart. This is achieved with shoulder flexion (raising the arm overhead) and elbow flexion (bending the elbow).
• Shortened Position: To maximally contract or shorten the long head, we bring its origin and insertion closer together. This is achieved with shoulder extension (moving the arm behind the body) and elbow extension (straightening the arm).

Lateral & Medial Heads

Since these heads are uni-articular, their length is only meaningfully affected by the elbow joint.

• Lengthened Position: Elbow flexion.
• Shortened Position: Elbow extension.

This means that any exercise involving elbow extension will train the lateral and medial heads. However, to preferentially target the long head—the largest of the three—we must manipulate the shoulder.

3. Exercise Selection for the Lengthened Position (Long Head Bias)

To capitalize on stretch-mediated hypertrophy for the long head, we need exercises that load the muscle from a position of shoulder flexion (arm overhead). This is where the evidence becomes compelling.

The key takeaway from the video is that overhead extensions produced significantly more hypertrophy in all three triceps heads, with the most dramatic effect on the long head.

This is because the overhead position places the long head in a uniquely stretched state, which, as we've learned, is a potent stimulus for growth. The following image from a research brief visually represents this phenomenon.

Key Exercises for the Lengthened Position:

1. Overhead Triceps Extensions (Cable, Dumbbell, or EZ Bar): These are the gold standard for targeting the long head. The overhead position guarantees the muscle is trained from a stretched state.
2. Lying "Behind the Head" Extensions (Skull Crushers): A standard skull crusher (lowering the bar to your forehead) is a good exercise. However, by allowing the bar to travel behind your head, you increase the degree of shoulder flexion, putting an even greater stretch on the long head. This subtle change can enhance the stimulus.

4. Exercise Selection for the Neutral & Shortened Positions

While overhead exercises are superior for overall mass, other movements can effectively target the lateral and medial heads and challenge the triceps in a more contracted (shortened) state. These exercises are typically performed with the shoulder in a neutral position (arms by your side) or in extension (arms behind you).

Key Exercises for Neutral/Shortened Positions:

1. Triceps Pushdowns: Performed with the arms at your sides (neutral shoulder position), this movement mechanically favors the lateral and medial heads. The long head is active, but not from a stretched position. The peak tension occurs at full elbow extension, making it excellent for a strong contraction and developing the visible "horseshoe" of the lateral head.

2. Triceps Kickbacks: This movement places the shoulder in extension, moving the triceps into its most shortened position. While less effective for overall mass due to lower loading potential and a poor resistance profile with dumbbells, it provides a unique peak contraction stimulus. Using a cable provides more continuous tension and makes the exercise more effective.

Coach's Note: Building a Complete Triceps Program

Your background in optimization is relevant here. The goal isn't to find one "best" exercise but to assemble a small, efficient portfolio of movements that collectively stimulate all three heads across their full contractile range.

Menno Henselmans, a prominent researcher in this field, explains why relying solely on pressing movements is insufficient and why isolation work, particularly overhead, is necessary.

A logical and evidence-based triceps workout could be structured as follows:

1. Lengthened-Position Movement (Long Head Priority): Start with your primary mass-builder. This puts the largest head under the most productive stimulus while you are fresh.
   • Example: Seated Dumbbell Overhead Extension or Cable Overhead Extension (3 sets of 8-12 reps).
2. Neutral-Position Movement (Lateral/Medial Head Priority): Follow up with an exercise that emphasizes the other two heads and challenges the muscle at a different point in its strength curve (peak tension at lockout).
   • Example: Cable Rope Pushdown (3 sets of 10-15 reps).

This two-exercise combination is highly efficient. It ensures the long head is trained in its productive stretched position and the lateral/medial heads get dedicated work for a complete stimulus.

Conclusion

In this lesson, you learned to deconstruct triceps training using the principles of anatomy and biomechanics. By understanding the bi-articular nature of the long head, you can now make intelligent, evidence-based exercise selections.

Key Takeaways:

• The triceps long head is a bi-articular muscle stretched by shoulder flexion (arm overhead). The lateral and medial heads are uni-articular.
• Overhead Triceps Extensions are the most effective exercise for stimulating the long head due to stretch-mediated hypertrophy and have been shown to be superior for overall triceps growth.
• Triceps Pushdowns are performed with a neutral shoulder position, making them ideal for targeting the lateral and medial heads and achieving a strong peak contraction.
• A complete triceps program should prioritize an overhead extension for mass and include a pushdown variation to ensure balanced development of all three heads.

Preview of the Next Lesson

Now that we have selected optimal exercises for both the biceps and triceps based on their anatomy, the next logical step is to ensure they are performed correctly. In our next lesson, we will identify common arm training mistakes (e.g., using shoulder momentum, improper elbow position) and apply anatomical cues to correct them, refining your technique for maximum stimulus and minimum injury risk.