Upper body
Traps
Trapezius
Also called: traps, trapezius muscle, upper traps
The trapezius is a large diamond-shaped muscle spanning the neck, shoulders and mid-back. Its upper fibres elevate the shoulder blade, the middle fibres retract it, and the lower fibres depress and upwardly rotate it. Shrugs only train the upper third.
Traps anatomy
The trapezius runs from the base of the skull down to the middle of the thoracic spine, and out to the shoulder blade and collarbone on each side. Together, the two sides form the diamond shape the muscle is named for.
Its three fibre regions pull the shoulder blade in three different directions, which is why it is better thought of as three muscles sharing a name than as one muscle you train with one exercise.
The lower trapezius in particular is underdeveloped in most people. It works with the serratus anterior to rotate the shoulder blade upward as you raise your arm overhead — a movement pattern that matters far more than its size suggests.
| Part | What it does |
|---|---|
| Upper trapezius | Elevates the scapula and extends the neck. Trained by shrugs and carries. |
| Middle trapezius | Retracts the scapula. Trained by horizontal rows with a deliberate squeeze. |
| Lower trapezius | Depresses and upwardly rotates the scapula. Trained by overhead work, Y-raises and prone lifts. |
- Origin
- The external occipital protuberance, the nuchal ligament, and the spinous processes of C7–T12.
- Insertion
- The lateral third of the clavicle, the acromion, and the spine of the scapula.
What the traps does
- Scapular elevation — shrugging the shoulders up (upper fibres).
- Scapular retraction — pulling the shoulder blades together (middle fibres).
- Scapular depression — pulling the shoulder blades down (lower fibres).
- Upward rotation of the scapula, essential for raising the arm overhead safely.
- Neck extension and lateral flexion (upper fibres).
Best traps exercises
| Exercise | Equipment | Role | Level | Why |
|---|---|---|---|---|
| Barbell shrug | Barbell | primary | Beginner | Straight up and down — rolling the shoulders adds nothing and irritates the joint. |
| Farmer's carry | Dumbbells or trap bar | primary | Beginner | Trains the upper traps isometrically under heavy load, plus grip and core. Enormous value per exercise. |
| Chest-supported row | Bench + dumbbells | primary | Beginner | The best middle-trap builder — the bench stops you cheating with body English. |
| Prone Y-raise | Bench + light dumbbells | primary | Beginner | One of the few movements that directly trains the lower trapezius. Use very light weight. |
| Face pull | Cable machine + rope | secondary | Beginner | Hits the middle traps alongside the rear delts and external rotators. |
| Overhead press | Barbell or dumbbells | secondary | Intermediate | The upward rotation demand trains the lower traps as a stabiliser. |
How to train the traps
Sets per week
8–16 hard sets across all three regions
Rep range
8–15 for shrugs, 10–20 for lower-trap work
Frequency
2 sessions per week
- Rows already train the middle traps substantially. Count that volume before adding dedicated work.
- Lower-trap exercises need light weight and strict positioning. Loading them heavily just recruits the upper traps instead, defeating the purpose.
- If your upper traps are overdeveloped relative to the rest of your back, the fix is usually more middle and lower trap work, not fewer shrugs.
Stretches and mobility
Upper trap stretch
Sit tall, one hand under the glute, gently tilt the head to the opposite side. 30 seconds each side.
Levator scapulae stretch
Turn the head 45° away, then look down toward the armpit. Hold 30 seconds.
Common mistakes
Rolling the shoulders during shrugs
The upper trapezius elevates the scapula — it does not circle it. Rolling adds a grinding path through the shoulder joint without adding any training effect.
Assuming traps means shrugs
Shrugs only train the upper third. If your goal is a thicker-looking back or better posture, the middle and lower fibres matter more, and they need rows and Y-raises.
Blaming tight traps on weakness alone
Persistent upper-trap tightness is often a positioning and load-management issue rather than a strength one. Persistent neck pain is worth a professional opinion, not just more stretching.
Traps FAQ
- What is the difference between upper, middle and lower traps?
- They pull the shoulder blade in three different directions. Upper fibres elevate it, middle fibres retract it toward the spine, and lower fibres depress and upwardly rotate it. Each needs a different exercise: shrugs, rows and Y-raises respectively.
- Do shrugs train the whole trapezius?
- No. Shrugs train the upper fibres almost exclusively. The middle fibres need horizontal rowing with a full squeeze, and the lower fibres need overhead or prone Y-raise style work.
- How do I fix overdeveloped upper traps?
- Usually by adding middle and lower trapezius work rather than by cutting shrugs. If the upper fibres dominate every pulling movement, strengthening the fibres that oppose them tends to be more effective than simply training less.
- Are traps a back or shoulder muscle?
- Anatomically it is a back muscle, but functionally it moves the shoulder blade, so it gets trained on both back and shoulder days. Where you put it in your programme matters less than making sure all three fibre regions get work.
References
- Kenhub — Muscle anatomy reference
- Physiopedia — Muscle and rehabilitation reference
- Schoenfeld, Ogborn & Krieger (2017) — Dose-response relationship between weekly resistance training volume and increases in muscle mass
- Baz-Valle et al. (2022) — Number of sets and hypertrophy in resistance-trained individuals: a systematic review
This page is general educational information about exercise and anatomy. It is not medical advice and not a substitute for assessment by a qualified clinician. If you have pain, an injury or a health condition, speak to a professional before changing how you train.