The Serratus Anterior: Your Secret Backbend Muscle

Why this overlooked muscle transforms your backbends, shoulder stability, and spinal freedom.

Most yoga practitioners think of backbends as “spine poses” — something created by the vertebrae, ribs, and back muscles drawing the body into extension. But one of the most important muscles for healthy, supported, powerful backbending isn’t on the back at all.

It’s the serratus anterior, a muscle most people never think about.

If your shoulders feel tight in Upward Dog…
If your lower back pinches in Cobra…
If Wheel Pose feels unstable…
If your neck compresses in any backbend…

Then serratus anterior is one of the missing pieces.

This muscle plays a central role in shoulder freedom, thoracic mobility, spinal extension, breath expansion, and head-neck safety — all essential components of backbending.

Let’s take a closer look at why serratus anterior might be your new favourite yoga muscle.

1. What Is the Serratus Anterior?

The serratus anterior is a broad, powerful muscle that wraps around the rib cage from the upper ribs to the inside edge of the shoulder blade (scapula).

Its main functions include:

• protracting (widening) the shoulder blades
• supporting upward rotation of the scapula
• stabilising the shoulder blade against the rib cage
• assisting in breath expansion
• coordinating movement between ribs, thoracic spine, and shoulders

In yoga, that translates directly to shoulder stability, spinal lift, and neck safety.

And yet… it is often underactive.

2. Why Backbends Need Serratus More Than You Think

Most people rely heavily on the lower back to initiate a backbend.
This creates compression rather than length.

But when serratus anterior activates:

• the rib cage lifts
• the thoracic spine gains space
• the shoulder blades upwardly rotate instead of pinching
• the neck no longer collapses backwards
• the entire backbend distributes evenly

A strong serratus anterior is what prevents the “jammed lower back, collapsed neck” pattern that so many yogis struggle with.

3. Serratus Anterior and the Shoulder Blades: The Key Relationship

Your backbend is only as good as your shoulder blade position.

Healthy backbends require shoulder blades to:

• move slightly forward (protraction)
• rotate upward
• slide wide along the rib cage
• maintain stability without gripping

Serratus is the muscle that makes all of this possible.

When serratus is weak, you see familiar yoga issues:

• shoulder blades pinching together
• elbows flaring
• shoulders climbing toward ears
• neck compression
• difficulty opening the chest
• limited thoracic extension
• over-reliance on the arms or lower back

These problems aren’t “flexibility issues” — they are serratus issues.

4. How Serratus Supports Different Backbends

Let’s break down some key postures.

Cobra Pose (Bhujangasana)

In Cobra, serratus anterior:

• draws the shoulder blades down and wide
• allows the chest to lift without collapsing into the neck
• frees the upper ribs for deeper breathing
• prevents the elbows from jutting outward

A serratus-supported Cobra looks gentle, long, and stable — not compressed or forced.

Upward Facing Dog (Urdhva Mukha Svanasana)

Upward Dog requires more load-bearing strength.

Serratus anterior helps by:

• stabilising the shoulder blades as the arms take weight
• lifting the chest forward and up
• preventing shoulders from “sinking” into the joints
• distributing extension evenly throughout the spine

Without serratus, this posture often becomes:

• neck crunch
• collapsing shoulders
• pinched lumbar spine
• tight breath

With serratus, everything opens.

Wheel Pose (Urdhva Dhanurasana)

Serratus is one of the most important forces for creating space in Wheel.

It helps:

• lift the ribs
• support upper-spine extension
• prevent shoulder blades from squeezing toward the spine
• keep weight out of the lower back
• open the chest more fully

Weak serratus = elbows splay, shoulders jam, lower back pinches.
Strong serratus = expanded, stable, spacious Wheel.

Camel, Bow, Locust & Variations

Serratus anterior keeps the shoulders wide and stable, allowing the spine to extend in a long arc rather than collapsing into a hinge.

This means:

• more space across the collarbones
• deeper breath
• better upper-spine mobility
• reduced neck strain

Even in “backbody-dominant” poses, serratus plays a huge supporting role.

5. How Serratus Helps the Neck Stay Safe

Forward head posture weakens serratus anterior (and weak serratus increases forward head posture — a vicious cycle).

When serratus is active:

• shoulders move down and forward
• the chest lifts
• the lower cervical spine lengthens
• the head stays balanced over the body
• vertebral artery positioning remains open and safe

This is especially important in backbends where dropping the head back can compromise blood flow.

Serratus supports the head by supporting the entire shoulder-to-spine system.

6. How to Feel Your Serratus in Action

Serratus is subtle. To experience its role in backbends, try these short experiments.

A. “Wide Shoulder Blades” Cobra

Come into Cobra.
Gently draw your shoulder blades away from your spine.
Feel your ribs lift and your neck release.
That’s serratus.

B. Plank with Serratus Activation

Press the floor away.
Allow your shoulder blades to glide wide.
Feel the upper ribs broaden.
This protraction is serratus at work.

Try Upward Dog right after — it will feel completely different.

C. Wall Slide Arc

Stand with forearms on a wall.
Slide upward while keeping ribs lifted and shoulder blades wide.
This mimics the serratus engagement you need in Wheel Pose.

7. How to Strengthen Serratus for Better Backbends

The best serratus exercises (yoga-friendly) include:

• Plank with protraction
• Dolphin with shoulder blade glide
• Wall slides
• Serratus push-ups
• Controlled Downward Dog transitions
• Quadruped “push the floor away” drills
• Forearm plank shoulder taps

Integrating these into your practice a few minutes each week transforms upper-spine mobility and backbend comfort.

8. Why Serratus Matters for Long-Term Yoga Practice

Serratus anterior is the silent stabiliser.
When it works well:

• backbends feel free
• shoulders don’t pinch
• your spine opens gracefully
• your neck relaxes
• your breath deepens
• your arms feel stronger
• transitions feel lighter

It protects your joints, spreads effort evenly across the body, and enhances the functional quality of your practice.

For most practitioners, serratus activation is the turning point where backbends go from “jam and push” to “lift and lengthen.”

9. Want to Understand This More Deeply?

If you want clear, practical anatomy that immediately improves your practice and teaching, explore the or the Fascia-Based Yoga Anatomy Program.

This program:

• teaches functional movement
• integrates fascia-based awareness
• improves spinal and shoulder mechanics
• is recognized for Yoga Alliance CE credits
• help yoga teachers elevate their cueing and class effectiveness

When you know what your body is doing, you can do it better.