Stuart McGill on Back Pain: Why "It Depends" May Be the Most Important Answer
- May 7
- 12 min read
Back pain is one of the most common health problems in the world. According to the World Health Organization, low back pain affected around 619 million people globally in 2020, and it remains the leading cause of disability worldwide.[^1]
Yet despite how common it is, most people still receive the same generic advice: stretch more, strengthen your core, do these exercises, avoid that movement, sit up straight, rest. If that advice worked, the global statistics would not look the way they do.
What if the most important answer is not a universal exercise, posture, or treatment? What if the most important answer is: it depends?
In this episode of The Good Health Society podcast, we sat down with Professor Stuart McGill — Distinguished Professor Emeritus in Spine Biomechanics at the University of Waterloo, and one of the world's most respected authorities on back pain assessment and rehabilitation.[^2] His three decades of laboratory work, clinical trials, and follow-up data with every patient he has ever treated have produced what is now widely known as the McGill Method.
The conversation cuts through one of the biggest problems in back pain care today: the belief that one method, one diagnosis, or one exercise can explain everyone's pain. Professor McGill's message is more precise — and more empowering. Find the specific mechanism of your pain. Stop provoking it. Then rebuild capacity in the right way for your body. Here is what we learned.
Why generic back pain advice fails most people
People differ on every variable that matters for back health: injury history, body type, movement habits, training age, occupation, comorbidities, psychological state, and goals. Two patients can be given the same exercise at the same dosage — one will adapt and get stronger, the other will leave with raging sciatica.
A deadlift may be the perfect tool for one person. For another — particularly someone with a sensitised disc or a recent flare-up — the same lift could keep them in pain for weeks.
This is why Professor McGill is famous for beginning his answers with two words: it depends.
That phrase is not evasive. It is the opposite of guessing. It is a sign of clinical precision.
A method that does not begin with the individual is not a method. It is a guess.
Assessment as troubleshooting, not diagnosis
Most medical assessments rely on a blood test or an image, followed by a debate about whether the finding actually explains the symptoms. Professor McGill approaches assessment differently — as an engineering troubleshooting exercise.
The logic runs like this:
Make observations. Watch how the person walks in.
Use provocative testing to gently and deliberately reproduce a small amount of the pain — knowing exactly what was done to provoke it.
Identify the variables that made it worse, and the variables that made it better.
Probe for the antidote: a motion, posture, load, or thought that reduces sensitivity.
Explore alternative explanations, because complex back pain is rarely one thing.
This is why a McGill-style assessment can take anything from ten minutes to several hours. A straightforward presentation can be sorted quickly. A patient who has already failed a dozen clinicians needs every prior intervention examined for why it failed before a new plan is built.
The shift here is critical: "non-specific" back pain does not exist. The pain is always specific — clinicians simply have not yet found the specific mechanism.
The first step: identify your pain triggers
Once back pain is understood as a problem with a specific cause, the most useful question changes.
Instead of asking "Which exercise is best for back pain?", the better question is:
What is your back sensitive to right now?
Triggers can include:
A particular posture
A specific movement direction
A load or carrying pattern
A duration of sitting or standing
A repeated work or sport task
A breathing or bracing strategy
A stress response
A combination of several of these
Once you know your triggers, the programme can be built around your body — not around a general theory.
Pain triggers, mastery, and the end of back-pain anxiety
Many long-term back pain patients arrive carrying something close to PTSD. They flinch at light touch. They cower from movement. The pain has become a boogeyman that strikes without warning.
Professor McGill's clinical observation is striking: when the assessment correctly identifies the specific triggers, something changes psychologically. The pain is no longer random. The patient now knows what offended the system, and what to do when it happens.
This is empowerment by mechanism. It often does the work that cognitive behavioural therapy is asked to do, because it removes the unpredictability that drove the fear in the first place.
This does not mean back pain is "all in your head." The body and brain are connected. Fear changes movement. Anxiety increases tension. Pain alters muscle activation. But mastery of the trigger restores the patient's sense of control — and for many people, that is the most important step in recovery.
"Not picking the scab": why recovery requires removing the offence
A powerful idea from the conversation is the concept of not "picking the scab."
When someone has a painful back, they often unknowingly repeat the exact movement, posture, or loading pattern that keeps the pain alive. They might do helpful exercises in the morning, then undo the benefit by sitting on a soft couch for hours, lifting carelessly, training too aggressively, or repeatedly entering the posture that provokes their symptoms.
This is why back pain recovery is not only about adding exercises.
It is also about removing the repeated offence.
In the early stage, the goal is often to calm the system down, avoid known triggers, and create a pain-free window. This does not mean doing nothing. It means doing the right amount of the right thing at the right time. We sometimes call this learning your own back hygiene: the daily habits, positions, and movements that help your back settle rather than stay irritated.
The McGill Big Three: what they are and what they are not
The McGill Big Three — the modified curl-up, the side plank, and the bird dog — are probably the most widely cited (and most widely misunderstood) exercises in modern rehab.
Two myths first:
The Big Three are not the McGill Method. They are a foundation that suits many patients in a particular phase of care.
Doing the Big Three while spending three hours an evening sunk into a soft couch will not fix your back. What you do for the rest of the day matters.
So why these three exercises specifically?
Professor McGill and his team were looking for the best available tools to build core endurance (which back pain patients consistently lack more than strength), in a way that:
Guarantees stability through the spine.
Conserves the spine — keeping load tolerable while symptoms are still sensitive.
Uses an isometric endurance protocol rather than a strength protocol.
The bird dog is a three-point bend rather than a cantilever — meaning roughly half the spinal load of a Roman chair extension, in a posture the patient can self-adjust for comfort.
The side plank delivers oblique and quadratus lumborum endurance with a short lever. The modified curl-up trains the abdominal wall without taking the lumbar spine into the flexion ranges that may be provocative.
The exercises survived not just biomechanical scrutiny but clinical trial outcomes. They became the foundation because they kept earning that position.
A point worth holding: even elite athletes setting world records still warm up with a bird dog. The exercise is not a beginner's tool. It is a foundational tool.
Phase 1 and Phase 2: the critical transition
A common reason rehab plateaus — or relapses — is that the patient (or clinician) confuses the absence of pain with the presence of healing.
The McGill Method recognises distinct phases:
Phase 1 — Wind down the pain. Identify triggers. Avoid picking the scab. Build the neurological pattern of pain-free movement. Use the Big Three and similar tools to create stability without provocation.
Phase 2 — Build resilience. No pain does not mean healed. Once life no longer triggers symptoms, the goals change: build a body that is robust against the very mechanism that originally caused the injury. The exercises evolve. Loading evolves. Movement repertoire expands.
Misunderstanding this transition is the source of most criticism the method receives online. Someone watches a clip of Phase 1 and concludes "all McGill does is the Big Three." It is the equivalent of watching a building's foundation poured and concluding the architect does not believe in walls.
Dosage and the tipping point: when more is not better
Every system in the body — musculoskeletal, endocrine, cardiovascular, even psychological — needs stress to stay healthy. Without it, tissues atrophy.
But every system also has a tipping point. Below it, stress drives positive adaptation. Above it, the same stress turns destructive. Recovery breaks down. The injury cycle restarts.
This is where many people in back pain recovery get stuck. They discover something that helps, then assume more of it must be better. But tissues need the right stress, followed by the right recovery. Too little leads to weakness and loss of capacity. Too much keeps the injury irritated.
Finding and managing that tipping point — and understanding that it shifts continually as you heal — is, in Professor McGill's view, the single most consequential job in long-term health. Not the surgeon's. Not the family doctor's. The job of the trainer or coach who programmes daily stress for the body.
The dose really is the poison.
The linkage: why your back pain may be a hip or ankle problem
One of Professor McGill's most useful coaching cues is this: the knees go where the hips command them to go, and where the ankles allow them to go.
The body is a linkage. Performance through that linkage depends on a strategic alternation of stability and mobility:
A stable, controlled core unleashes the hip as the athletic engine.
An athletic hip controls the knee.
The ankle either permits or prevents the whole sequence.
This explains why a back pain pattern can sometimes be solved with a centimetre of heel lift, or why a stiff ankle from an old break can be the actual driver of a chronic low-back complaint. It is also why training the hip in isolation, without a stable core to organise it, often fails to translate.
When the linkage is right, stress concentrations dissipate. When it is wrong, the spine pays the bill.
Breathing: why there is no single "right" way
Few topics generate more confused content online than diaphragmatic breathing. Professor McGill's view is, predictably, contextual.
For an anxious patient locked into shallow, guarded breathing patterns, slow, relaxation-style breathing is often the right starting point.
For an athlete preparing to deadlift heavy or absorb an impact, a power breath behind a braced trunk is the right pattern. Soft diaphragmatic breathing alone will not let you move 100 kg off the floor.
For a patient with COPD who has lost lung elasticity and now breathes with their spine, the entire mechanical conversation changes again — and is often the source of their thoracolumbar pain.
The mistake is not in any of these breathing patterns. The mistake is in believing one of them is universally correct.
There is also a long-running myth — that intra-abdominal pressure (IAP) reliably unloads the spine. Professor McGill's group measured this carefully, and the net effect of building IAP is generally more spinal compression, not less, because the abdominal wall activation needed to create the pressure outweighs the unloading. IAP has its place — it stiffens the trunk for performance — but the unloading story is not what the math says.
Ergonomics is not just about making life easier
Many people think ergonomics means reducing load, buying a better chair, or making work easier. Professor McGill's data tells a different story: tissue health requires the right amount of stress. Too much load can injure. Too little can weaken. The body needs variation, movement, and appropriately dosed challenge.
He shared one striking case: a tire manufacturing plant paying out roughly $1.25 million annually in low-back compensation invested $250,000 in job coaching — placing a kinesiology student in the plant, training the occupational health nurse, and teaching workers how to move with less stress on their bodies. The next year, they saved roughly five times the investment.
For office workers, the answer is rarely a perfect chair. It is changing position, taking movement breaks, restoring hip function, improving walking mechanics, and breaking up long static postures.
The principle is simple but powerful:
The body needs the right stress, not zero stress.
Which Stuart McGill back pain book is for you?
Each of Professor McGill's books has a specific job, and people often pick the wrong one.
Back Mechanic — written for the lay public. A self-assessment-driven guide for the person currently in pain. Professor McGill stands by helping roughly 95% of readers.
Ultimate Back Fitness and Performance — for when you are out of pain and want to build performance capacity on top of a stable foundation.
Low Back Disorders — the clinician and researcher's text. Mechanisms, prevention, deeper science.
If you are in pain right now, Back Mechanic is the place to start.
Seven practical takeaways
If you take nothing else from this conversation, take these:
Stop looking for the one perfect exercise. The best exercise depends on your pain mechanism, your current tolerance, and your goal.
Learn your triggers. Notice which positions, movements, loads, and durations make pain worse or better.
Do not keep "picking the scab." Repeated provocation makes recovery much harder.
Respect dosage. More is not always better. The right amount creates adaptation; too much creates setbacks.
Build endurance before chasing strength. Most people with back pain need control and endurance long before they need heavy loading.
Progress when your body is ready. No pain is not the finish line. Build capacity gradually.
What you do for the rest of the day matters more than your exercise routine. A great rehab program cannot outrun a bad couch.
When to seek medical help
This article is educational and is not a substitute for medical diagnosis or treatment.
Seek urgent medical advice if you have back pain combined with any of the following:
Loss of bladder or bowel control
Numbness in the saddle area (inner thighs, groin)
Progressive leg weakness
Fever or unexplained weight loss
Significant trauma
Severe pain that is not improving
If your pain is persistent, recurring, or radiating into the leg, work with a qualified clinician who can assess your specific case.
Final thought: recovery begins with understanding
Professor Stuart McGill's work reminds us that back pain recovery is not about blindly following trends. It is about understanding the person, the pain mechanism, the movement pattern, the dosage, and the goal.
That is why "it depends" is not a weak answer.
It may be the most honest and useful answer in back pain care.
When you understand what your back is sensitive to, you can stop guessing. You can stop provoking the pain. You can start building capacity with a clearer plan.
That is where real progress begins.
Take the next step
Dealing with sudden lower back pain? Start with The Good Health Society's Acute Back Pain Guide — safe first steps, practical do's and don'ts, and clear guidance to help you avoid making things worse during a flare-up.
Want to understand your back and build long-term resilience? Explore The Good Back Academy, our signature programme designed to help you learn the foundations of back health, movement quality, and sustainable recovery.
You can also find a directory of certified BackFitPro clinicians worldwide, along with Professor McGill's books and original research, at backfitpro.com.
Frequently Asked Questions
Who is Professor Stuart McGill?
Professor Stuart McGill is a Distinguished Professor Emeritus in Spine Biomechanics at the University of Waterloo. His work has focused on low back mechanics, injury mechanisms, rehabilitation, occupational biomechanics, and high-performance training. He is the author of Back Mechanic, Ultimate Back Fitness and Performance, and Low Back Disorders.[^2]
What is the McGill Method?
The McGill Method is an evidence-based approach to back pain assessment and rehabilitation that focuses on identifying the specific mechanism of a person's pain, removing triggers, and building capacity with carefully matched exercises and movement strategies.[^3] It is built on troubleshooting-style assessment and a phased programme that progresses from pain reduction to resilience and performance.
What are the McGill Big Three exercises?
The Big Three are the modified curl-up, the side plank, and the bird dog. They were selected for their ability to build core endurance and stability while keeping spinal load tolerable for people in pain. They are foundational, not exhaustive — many people will progress well beyond them.
Are the McGill Big Three enough to fix back pain?
Not always. The Big Three can be very useful for many people, but they are not a complete solution for every case. Professor McGill emphasises that exercises must be matched to the person, their pain triggers, and their stage of recovery.
Are deadlifts bad for your back?
Not necessarily. A deadlift can be an excellent exercise for some people and aggravating for others — depending on technique, load, dosage, injury history, and current tissue sensitivity. The question is not whether deadlifts are "good" or "bad," but whether they are appropriate for that person at that time.
Is back pain always caused by weak muscles?
No. Back pain involves many possible factors, including tissue sensitivity, repeated provocative movements, poor load management, work demands, stress, previous injury, and movement habits. Weakness may be part of the picture, but simply getting stronger is not always the answer.
What should I do first if I have acute lower back pain?
The first step is to avoid making the pain worse. Identify which positions and movements aggravate your symptoms, reduce repeated triggers, and use safe strategies to calm the pain. The Good Health Society's Acute Back Pain Guide is designed to give you clear first steps and practical guidance during a flare-up.
Can I rehabilitate my back at home?
For most cases, yes — particularly with the right education. Professor McGill's Back Mechanic is designed for self-assessment and self-management, and helps the majority of readers. For complex, persistent, or radiating cases, an in-person assessment with a qualified clinician will accelerate recovery significantly.
🎥 Watch the Video Breakdown
This article summarises a podcast conversation between The Good Health Society and Professor Stuart McGill. We are deeply grateful for Professor McGill's time, mentorship, and continued generosity with his expertise.
[^1]: World Health Organization, Low Back Pain Fact Sheet — https://www.who.int/news-room/fact-sheets/detail/low-back-pain
[^2]: University of Waterloo, Stuart M. McGill, C.M. — https://uwaterloo.ca/kinesiology-health-sciences/people-profiles/stuart-mcgill
[^3]: BackFitPro — https://www.backfitpro.com/
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