Lower back pain is the most common musculoskeletal complaint in the world.

At any given point, an estimated 540 million people are experiencing it. It’s the leading cause of disability globally and one of the most common reasons people miss work.

And yet, for most people, the approach to managing it is the same: rest, anti-inflammatories, and hope it passes.

That approach addresses the symptom. It almost never addresses the cause.

Here’s what actually causes most lower back pain — and why the right training is one of the most effective long-term solutions available.

FIRST: WHAT LOWER BACK PAIN USUALLY IS NOT

Before talking about causes, let’s clear up the most common fear.

Most lower back pain is not caused by disc herniation, structural damage, or serious pathology. Studies using MRI imaging have found that a significant percentage of people with no pain whatsoever have disc bulges, herniations, and other findings that look alarming on a scan.

The presence of a structural finding doesn’t automatically explain pain. And the absence of a structural finding doesn’t mean there’s nothing going on.

This matters because it changes the treatment approach. Most lower back pain — the chronic, nagging, lifestyle-related kind — responds to movement and training, not surgery, not extended rest, and not a lifetime of avoiding physical activity.

CAUSE 1: WEAK POSTERIOR CHAIN

The posterior chain — hamstrings, glutes, and lower back extensors — is responsible for stabilizing and moving the pelvis and lumbar spine.

When these muscles are weak (as they are in the vast majority of people who sit for work), the lower back is forced to pick up the load they were supposed to carry. Constantly. Every time you stand, walk, bend, or lift anything.

The lower back is not designed to work in isolation. It’s designed to work as part of a team — with the glutes and hamstrings doing the heavy lifting while the lower back stabilizes. When the team is weak, the lower back overworks and eventually protests.

The fix: train the posterior chain. Deadlifts, Romanian deadlifts, glute bridges, hip thrusts, and hamstring curls. Build the muscles that are supposed to share the lower back’s load.

CAUSE 2: WEAK CORE THAT CAN’T STABILIZE THE SPINE

The core’s primary job is not to produce movement — it’s to resist movement. To create a stable foundation from which the limbs can move and the spine can be protected.

When the core is weak, the lumbar spine lacks the stabilization it needs under load. Every time you lift, twist, or even just stand for an extended period, the spine is bearing more stress than a well-stabilized system would allow.

The fix: train the core for stability, not just aesthetics. Planks, dead bugs, Pallof presses, farmer carries — exercises that challenge the core to resist movement under load.

CAUSE 3: TIGHT HIP FLEXORS AND POOR HIP MOBILITY

Sitting for extended periods shortens and tightens the hip flexors — the muscles that connect the front of the hip to the lumbar spine and femur.

Tight hip flexors pull the pelvis into an anterior tilt (forward rotation), which increases the arch in the lower back and places the lumbar spine in a position of chronic extension stress.

Poor hip mobility — the inability to move through a full range of motion at the hip joint — forces the lower back to compensate for movements the hip was supposed to make. Every time you bend to pick something up, your hip’s limited range means your lower back bends instead.

The fix: hip flexor stretching, hip mobility work, and strengthening the glutes (which are the hip flexors’ primary antagonist and help normalize pelvic alignment).

CAUSE 4: POOR MOVEMENT MECHANICS

Most people never learned how to move correctly under load. They round their lower back to pick things up. They twist awkwardly to reach something. They sit in compromised positions for eight hours and then ask their back to perform normally when they finally stand up.

Years of repeated poor-quality movement accumulates. Discs compress unevenly. Muscles develop imbalances. Tissues that have been chronically stressed eventually become painful.

The fix: learn to move correctly. Specifically, learn the hip hinge — the fundamental movement pattern that protects the spine every time you load it. This is exactly what deadlift coaching teaches.

THE ROLE OF SEDENTARY BEHAVIOR

All four of the above causes are made significantly worse by sedentary behavior.

Sitting for extended periods does several things simultaneously: shortens the hip flexors, shuts off the glutes (they can’t contract properly when you’re sitting on them), reduces spinal mobility from lack of movement, and creates sustained compressive forces on the discs.

Eight to ten hours of sitting, five days per week, is one of the most common contributors to chronic lower back pain in adults under 60.

The solution isn’t to never sit — that’s unrealistic. It’s to counteract the effects of sitting through regular movement, hip mobility work, and strength training that restores the function sitting degrades.

WHY TRAINING HELPS (AND REST OFTEN DOESN’T)

The instinct when the back hurts is to stop moving. Rest it. Protect it.

For acute injuries, short-term rest is appropriate. But for chronic lower back pain — the kind that’s been there for months or years — extended rest typically makes things worse.

Movement is how the spine stays healthy. Discs don’t have direct blood supply — they get nutrients through the pressure changes that come from movement. The muscles protecting the spine don’t get stronger from rest.

Appropriate, progressive strength training that targets the posterior chain, core, and hip mobility is one of the most evidence-backed interventions for chronic lower back pain. Multiple systematic reviews have found that exercise therapy — particularly strengthening exercise — outperforms passive treatments (rest, medication, massage) for long-term pain management.

Our approach:

Assessment first. We want to understand your specific situation — what movements are painful, what the history looks like, what you’ve tried before.

Posterior chain work from day one. Building the glutes and hamstrings takes pressure off the lower back, often producing noticeable symptom relief within weeks.

Hip mobility and hip flexor work. Addressing the tightness and restriction that’s feeding the problem.

Core stability training — the kind that actually protects the spine, not just crunches.

Movement pattern correction. Teaching the hip hinge and other fundamental patterns correctly so daily activity stops being the source of repeated stress.

This isn’t a quick fix. But it is a real one.

If lower back pain is part of your story — bring it to the free no sweat intro conversation. It’s one of the areas where good coaching makes the clearest difference.

Book at forge-fitness.net.