When most people think about strengthening their core, they immediately picture endless sit-ups or six-pack abs. While strong abdominal muscles are beneficial, they are only one part of a much larger system that keeps your back healthy, stable and pain-free.

Your spine relies on a team of muscles working together, much like the mast of a sailboat supported by multiple cables and guide wires. If one of these structures weakens, the entire system becomes less stable, increasing your risk of pain and injury.

Understanding Your Core

A healthy back depends on two groups of muscles:

  • Deep core muscles – responsible for stability and control.
  • Superficial core muscles – responsible for movement and generating force.

Both groups play an essential role in protecting the spine and allowing you to move efficiently.

The Deep Core Muscles

Multifidus – Your Spine’s Guide Wire

The multifidus is one of the most important muscles you’ve probably never heard of. Running deep alongside the spine, it connects directly to each vertebra and provides exceptional spinal stability.

Unlike larger muscles that create movement, the multifidus works behind the scenes to:

  • Stabilise each spinal segment
  • Resist compression and shear forces
  • Protect the facet joints
  • Provide over two-thirds of the spine’s stiffness

Unfortunately, back pain can quickly switch this muscle “off”. Once inhibited, it rapidly loses strength, forcing larger muscles to compensate. This creates a cycle of instability that often leads to recurring back pain.

The good news is that the multifidus responds well to targeted control exercises and even activities such as brisk walking. Heavy weightlifting alone is often not enough to strengthen this important stabiliser.

Transversus Abdominis – Your Natural Corset

The transversus abdominis is the deepest abdominal muscle, wrapping horizontally around your torso like a corset.

Its job is to stabilise the spine before movement even begins. In fact, it activates milliseconds before you move your arms or legs, preparing your body for safe movement.

This muscle also:

  • Supports the pelvis
  • Compresses and protects internal organs
  • Works closely with the multifidus

Exercises such as planks and side planks are excellent ways to strengthen the transversus abdominis.

Pelvic Floor and Diaphragm

Many people associate pelvic floor exercises with pregnancy or bladder control, but these muscles also play a critical role in supporting the spine.

Working together with the diaphragm and transversus abdominis, the pelvic floor creates a stable foundation for the trunk.

Although the diaphragm’s primary role is breathing, it also contributes significantly to spinal stability by helping regulate pressure within the abdomen.

The Larger Core Muscles

Erector Spinae

The erector spinae consists of a large group of muscles running vertically along both sides of the spine.

These muscles help you:

  • Stand upright
  • Extend your back
  • Generate lifting power
  • Maintain posture

While incredibly strong, they are designed to work alongside the deep stabilising muscles—not replace them.

Quadratus Lumborum

Often referred to simply as the QL, the quadratus lumborum is one of the deepest muscles in the lower back.

It connects the pelvis to the lower ribs and plays a major role in side bending and spinal stability.

Because it is constantly active during sitting, standing and walking, it is particularly vulnerable to overuse.

An overworked quadratus lumborum is one of the most common causes of lower back pain that radiates into the hips and buttocks.

Why Sitting Is One of the Biggest Problems

Modern lifestyles require us to spend hours sitting every day, often leaning forward over a computer or mobile phone.

Research published in 2025 highlighted prolonged, uninterrupted sitting—especially in a slumped forward posture—as one of the biggest contributors to lower back pain.

Remaining in this position for extended periods:

  • Increases pressure on the lumbar discs
  • Reduces blood flow to supporting muscles
  • Causes metabolic waste to build up
  • Irritates surrounding nerves
  • Leads to pain spreading into the hips and glutes

If you’ve ever struggled to stand up comfortably after sitting through a long meeting or meal, you’ve experienced this first-hand.

Building a Stronger, Healthier Back

A healthy spine isn’t created by strong abdominal muscles alone.

Instead, it relies on the coordinated function of:

  • Multifidus
  • Transversus abdominis
  • Pelvic floor
  • Diaphragm
  • Erector spinae
  • Quadratus lumborum
  • Gluteus maximus
  • Latissimus dorsi

By strengthening both the deep stabilising muscles and the larger movement muscles, while reducing prolonged sitting and improving posture, you can significantly reduce your risk of chronic back pain.

Final Thoughts

Back pain is rarely caused by a single weak muscle. More often, it’s the result of an imbalance within the body’s natural support system.

Focus on improving posture, moving regularly throughout the day, strengthening your entire core and avoiding long periods of uninterrupted sitting. Small, consistent changes can have a significant impact on your long-term spinal health and help keep your back strong, stable and pain-free.