Why does mass-market yoga sometimes leave a client in more pain?
A student comes to you to be rid of back pain, of that ache across the neck and shoulders. A few sessions later they write: "Why does it hurt MORE after practice?" The feeling is both bewildering and frightening for your reputation — and you are not the only teacher it happens to. But before you blame your own cueing or start doubting the whole discipline, hear this: it is usually NOT your fault, and not because "yoga is bad". There is a very clear anatomical reason underneath, and once you see it you will never teach the same way again. This lesson takes that "WHY" apart — from the big picture right down to each layer of tissue — so you can avoid harming anyone and explain it back to your students with confidence.
🎁 A gift from Tuấn Anh to teachers who want to master the craft.
Yoga is not at fault — the MISMATCH is
This is the lens for the whole lesson. Every body is its own structure: the proportions of the limb bones, the shape of the joint sockets, the laxity of the ligaments, the history of injury, the underlying conditions — all of them differ.
- The direct consequence: in the same Paschimottanasana (a straight-legged forward fold), someone with long hamstrings reaches the floor easily; someone with tight hamstrings has their pelvis dragged into a posterior tilt → the lumbar spine rounds → pressure piles on to the L5–S1 disc. The same action, two different outcomes.
- Everyone's bones differ: some poses are simply NOT accessible to this person's bone structure without modification — and that is not 'being bad at it'.
- The aim of yoga is NOT a 'perfect' asana judged against a shared geometric template, but bringing a body back to a safe neutral on its own terms.
What this gives you: stop imposing one 'correct shape' on a whole class; replace it with the question 'what does this pose do for THIS body?'. This is the ground that lets you offer variations with confidence instead of feeling you are 'teaching off the lesson plan'.
Yoga is as safe as other recommended forms of exercise — possibly safer, thanks to slow movement and the spirit of non-harm. BUT that is only true WHEN it is respected properly.
- According to epidemiological surveys of adverse events in yoga practice (adverse-event surveys of practitioners, NOT a universal anatomical law), yoga can cause musculoskeletal pain in about one practitioner in ten, and aggravate roughly one in five existing injuries.
- Also according to this group of surveys, of those aggravated, a considerable proportion were severe enough to stop practice for more than three months.
- The bitter paradox: the very group who come to yoga to CURE their back pain are the most likely to end up in worse pain when they meet a mass-market, one-template-for-everyone class.
What this gives you: these are reference figures to dispel the fantasy that 'yoga is gentle, therefore absolutely safe, and anyone can do anything'. They are not there to frighten you — they are the reason you need screening and individualisation.
This is the root physical principle explaining why forcing range so easily causes injury. A synovial joint (shoulder, hip, knee…) has two OPPOSING jobs: to be solid, and to allow movement.
- The core law: the greater the range of motion (ROM), the LESS stable. Gain one and you lose the other.
- The shoulder is the extreme case: its socket is very shallow (the comparison runs: the hip is a bowl holding an orange, the shoulder a spoon holding a lemon) → the greatest mobility but the poorest stability, depending entirely on the rotator cuff tendons.
- So forcing range = pushing the joint towards the less stable end — precisely where it is most vulnerable.
What this gives you: when a student 'shows off' a great deal of flexibility at the shoulder or hip, understand at once that this is a region that NEEDS more stability, not a place to push deeper.
If you believe yoga is powerful enough to bring profound benefit, you are obliged to admit that it is also powerful enough to do harm — and to treat it with exactly that much respect. (after Science of Yoga, DK)
The same pose: safe for one person, overload for the next. The culprit is the MISMATCH between a 'one size fits all' class and one particular body.
Five traps of the 'one size fits all' class
These two traps travel together and are the most practical root of the problem.
- A class of 20–40 people: one teacher cannot watch and correct every individual. Who is off axis, who is holding their breath and gritting through — you have no time to see it.
- The deadly blind spot: many students do NOT know what conditions they have — osteoporosis, arthritis, a mild herniation, high blood pressure — and it only shows the moment heavy load is dumped on them in a crowded class.
- 'One instruction for everybody' pushes the person with a contraindication into precisely the dangerous shape: someone with osteoporosis into an unsupported flexion-and-twist, someone with high blood pressure into an inversion, someone with a herniation into rolling up the spine.
How to correct it: take one minute at the start to ask ('anyone in pain, recently injured, pregnant, high blood pressure?'), and have one or two safe variations ready by default for every risky pose rather than hoping to spot the fault.
The instruction 'everybody extend the arms straight' (Warrior III, Warrior II, Half Moon) sounds harmless and is a physical trap.
- The principle of leverage: arms extended straight = a LONG lever = load on the spine and shoulder several times greater than with the hands at the heart. The same 'pose', and an entirely different intensity depending on each person's strength.
- For someone without the strength yet, this collective instruction produces immediate overload of the shoulder and lower back.
- The load reduction already available: shorten the lever — bring the arms close to the body or the hands to the heart. This is a tool of individualisation that crowded classes usually overlook.
What this gives you: always cue a 'short-arm version' alongside, for beginners. You are not lowering the standard — you are giving the right dose of load to the right body.
These two cultural traps make students push past their own threshold of safety.
- Racing for depth: seeing the person next to them reach the floor, a student strains to match it and loses their own body's self-regulating signals. The hyper-flexible are brought out to demonstrate and praised as 'good' — inadvertently making performance the standard.
- 'No pain, no gain': a line imported by mistake from the gym. In yoga, sharp pain is a WARNING, not a measure of progress. Progress comes slowly, a little at a time.
- Myth-busting: 'being able to do a hard pose = a healthy, correct body' is WRONG — many people get into hard poses quickly only because they were born with lax ligaments, which is a sign of risk, not of capability.
What this gives you: speak out against 'no pain, no gain' in the class itself; do not use the most flexible person as the model — demonstrate the version with props as well, to normalise modification.
The bigger the class the greater the profit, but class size is also the very variable that stops a teacher seeing who is about to be hurt — a conflict between money and safety that few dare to name.
It is not that one pose does harm — it is that the mass-market FORMAT creates the conditions in which a mismatch turns into an injury.
Inside the body when it is forced too far — what you do not see
This is the biophysical ground of the entire subject of safety. Tissue under stretch passes through zones:
- The elastic zone: remove the load and the tissue returns to its normal length. Safe.
- The yield point: the boundary threshold. Past it, damage begins.
- The plastic zone: the tissue can NO LONGER return. Push on to the 'ultimate failure point' = a complete tear.
A hot room is a trap: heat warms the tissue quickly so it stretches deeper at once — which is exactly what makes it easy to pass the yield point unawares, and blurs the sensation of the threshold.
What this gives you: explain to students that the sensation of 'maximum pull, burning, trembling' means they are approaching the yield point — and that the only way to avoid it is NOT to push past their own limit, rather than finding 'one more centimetre'.
This is the strongest point of agreement across the anatomy texts, and the most misunderstood in class.
- Ligament (bone to bone) and tendon (muscle to bone) are almost inelastic and cannot contract. Pulling them past their normal length is an injury, and they are NOT certain to return to their former length → the joint loses its stability.
- This is true of EVERY joint, and it happens often in yoga when a student tries to push past the body's limit.
- The golden rule: we want to stretch MUSCLE, NOT tendon or ligament. The sensation of stretch must sit in the MIDDLE of the muscle belly, not up against the joint.
- Ligaments also carry sensory nerves reporting the position of the joint; stretched slack, they garble proprioception. And tendon and ligament heal slowly because of their poor blood supply.
What this gives you: when a student reports tension 'right at the joint' (not in the belly of the muscle) → stop; that is the signal that the wrong tissue is being pulled. Be especially careful with pregnant students (the hormone relaxin softens every ligament).
The single most important paradox for you to recognise in a class.
- Someone born with lax ligaments cannot hold a joint steady — common enough to have its own name, hypermobility syndrome. There is a clear correlation between joint hypermobility and chronic joint pain.
- The dangerous mechanism: they may have UNDER-active pain receptors in the joint capsule → they go far too deep into a pose WITHOUT receiving the warning signal of pain → destroying the joint without knowing it.
- They reach hard poses very quickly, so they are often used to demonstrate and praised as 'good' → pushed into performance contortions → and grow still less stable.
How to recognise and correct it: the signs include hyperextending elbows and knees, a thumb that bends to the forearm, and getting into deep poses 'far too easily'. With this group, steer towards STRENGTHENING asana and co-contraction (lightly contracting part of the muscle being stretched, to create a stability signal), and AVOID every extreme or over-arched action. For them, the instruction is 'make force', not 'stretch further'.
Why does a pose that 'looks correct' but sits off axis still destroy a joint?
- Joint reaction force: muscular contraction and gravity create compression across the joint surface, which needs to be spread over the LARGEST possible area. Once out of congruency, a large force piles on to a small area of cartilage → damage → over time, degeneration.
- Joint cartilage is avascular: it has no blood supply of its own and is fed by movement (the pumping of synovial fluid). VARIED movement is a benefit — but forcing extremes on to a joint that is off axis or inflamed wears it unevenly, rough as sandpaper.
- Use the big joints to protect the small ones: use the hip and shoulder (large range) to generate the movement, protecting the knee, lumbar spine and wrist (small range). Mass-market yoga often makes a small joint 'carry' what a large one should.
What this gives you: setting the axis is about spreading force over a large area — that is why 'point the kneecap at the middle toe' or 'sacrum centred between the two hip bones' matters, and not for the sake of appearance.
Reaching the yield point is already a tear — and damage in the plastic zone barely recovers.
The fashion for 'stretching as deep as it goes' is dangerous because there are tissues that, once pulled too far, NEVER return to what they were.
The five most injury-prone regions: the common cue → what breaks → who is most at risk
The region blamed most often, and the profession's great anxiety.
- The common harmful cues: 'fold deeper, reach the floor' (a straight-legged forward fold) and 'roll up one vertebra at a time'.
- What breaks: folding forward pushes the disc BACKWARD towards the spinal canal; tight hamstrings dragging the pelvis into a posterior tilt pile still more pressure on to L5–S1 → a risk of a bulging or herniated disc. Rolling up 'one vertebra at a time' unloaded, without using the core, can cause or worsen a herniation, and compression fractures in someone with osteoporosis.
- Who is most at risk: people with tight hamstrings, desk workers who sit a great deal (short psoas, weak core), people with osteoporosis, and anyone who already has a herniation.
How to correct it: let them bend the knees slightly, or sit on a block, so the pelvis tips FORWARD and the spine stays neutral. Come out of a fold with a 'hip hinge' (a wide base, hands on the thighs, transverse abdominis engaged, press up) rather than unrolling vertebra by vertebra. The core must be engaged — leaving the core out of a backbend or a fold is itself a great source of stress for the lower back.
The 'new' yoga injuries cluster heavily around arm and shoulder, and most of them come from the very poses everybody does.
- Chaturanga — 'the most misunderstood pose': the fault is placing the hands too far forward and letting the shoulders drop below → straining the front of the shoulder capsule and the rotator cuff tendons. The correction: elbows at 90°, wrists under the elbows, shoulders level with the elbows, and enough strength in the rhomboids and serratus anterior to hold the blades.
- Downward Dog: if the elbows are NOT straightened, the acromion is not lifted clear of the supraspinatus tendon → repeated often, this abrades or tears the rotator cuff (supraspinatus is the most commonly injured of them).
- The neck in Shoulderstand and Plough (Sarvangasana, Halasana): load piled on to the fragile cervical vertebrae — high risk, and contraindicated with a neck injury or high blood pressure.
- Small harmful cues: 'lift the shoulders to the ears' strains the upper trapezius → neck pain and headaches; craning the neck to look at the hand in Trikonasana strains it too.
What this gives you: prefer knees-down Chaturanga for beginners; always cue 'shoulders drawing away from the ears' and straight elbows in Downward Dog; take Plough and Shoulderstand out of a crowded mixed-level class.
The knee is a hinge that barely rotates — and yoga asks it to rotate more than it can.
- The mechanism: the knee is only permitted to rotate when FLEXED, and only a little. Padmasana (Lotus) demands external rotation, Virasana (Hero) internal rotation — and if the HIP lacks the range, the knee 'carries' that rotation → a torn meniscus or collateral ligament. The meniscus, though it can shift a little, still tears under a strong twist.
- Warrior I and II: the classic fault is the front knee pushing PAST the ankle, or the thigh falling inward. Too short a stance → the knee over-stretches; too wide a stance → the hip over-stretches.
- An objective DANGER criterion: if, in a simple cross-legged sit, the knees sit HIGHER than the iliac crest, then Lotus is a dangerous pose for that person — they should not attempt it yet, and must build hip range gradually first.
What this gives you: the rule 'never let the knee pass the ankle', point the kneecap at the middle toe, and OPEN THE HIP ENOUGH before any folded-leg pose. Never force a knee with your hands — this is a joint that does not forgive.
A quiet region that causes persistent pain, especially in women.
- The harmful cues: twisting deep, 'twist as far as you can go', the widest possible leg split, a strong forward fold without holding the pelvis steady.
- What breaks: the SI joint only glides slightly; extreme stretching leaves the SI ligaments lengthened without recoil → a less stable region, inflammation and pain. In a twist, without a stable pelvis (the sacrum centred between the two iliac bones, the twist happening ABOVE the pelvis) the SI joint is wrung.
- Twisting at the wrong level: many lumbar injuries in yoga happen because a twist is forced through the lower back instead of through the chest — the lumbar spine is limited in rotation (its large spinous processes block it), and the thoracic spine is where rotation belongs.
- Who is most at risk: women postpartum (relaxin still acting), hypermobile people, and anyone taking too wide a stance in a forward fold.
What this gives you: cue 'keep the two hip bones square and steady' before any twist; lead the twist from the CHEST, never wrenching it through the lower back.
The body's two outer ends, usually forgotten, and the harm spreads upward.
- The wrist: weight-bearing in Downward Dog, Plank and arm balances before the wrist is accustomed to load → strain and inflammation. Most common in beginners and in anyone with little upper-body strength.
- The foot — the 'chain of collapse': a weak foot with a dropped inner arch is no longer a solid foundation → the misalignment spreads UP and causes problems at the knee, the hip and the spine. A clear illustration of 'the source of pain is not where the pain is'.
- Knee hyperextension: when a class is told to 'straighten the knees completely', anyone with weak calves or lax ligaments will lock the knee past its limit → stress on the cartilage.
What this gives you: teach them to spread the load evenly across the hand (the base of the fingers, the pads); offer the variation of resting on fists or padding the wrist with a folded towel; and cue 'press the four corners of the foot evenly' and 'engage the calf lightly, do not lock the knee' in every standing pose.
The source of pain is NOT always where the pain is — a weak foot can be the root of knee pain, and a tight pectoralis minor can be the root of 'arm pain'.
Work from the centre outwards. Every region has one universally used cue that inadvertently does harm, and one group most likely to suffer from it.
'A healthy stretch' or 'a pain warning'? — the signal table
Teach students to assess themselves along four easily remembered axes:
- LOCATION: a healthy stretch sits in the MIDDLE of the muscle belly. A red flag is pain right at the JOINT, inside the joint, or in a tendon or ligament.
- QUALITY: a healthy stretch is a dull pulling sensation, bearable. A red flag is sharp, stabbing, burning, or numb — above all a sensation running down a limb (a neurological sign).
- BREATH: in a healthy stretch the breath stays smooth and even. A red flag is having to HOLD THE BREATH, grimace, or grip to bear it.
- AFTER LEAVING THE POSE: a healthy stretch eases the moment you come out. A red flag is pain that lingers, or grows worse the next day.
The concrete stopping rule: avoid anything that causes pain or INCREASES pain; be wary of a sharp or burning sensation running down a limb; avoid anything that causes NUMBNESS.
What this gives you: say this table out loud at the start of class so students can be 'their own teacher' — which compensates for the fact that you cannot watch forty people at once.
This distinction saves you from two opposite errors.
- Acute pain (a sprain, a fall, a fresh injury): usually needs REST to heal → avoid or modify the pose, and give the tissue time to knit. The mass-market class errs by pressing someone in acute pain to 'keep going, stretch it out' → making it worse.
- Chronic pain (beyond about three months, past the healing time): usually has no actual tissue damage left, and the alarm system has become 'too sensitive' → it needs MORE movement, because exercise reduces chronic pain. The mass-market class errs by advising someone in chronic pain to 'rest until it heals' → trapping them in a spiral of fear of movement.
- Scar tissue after a muscle tear closes the wound but NEVER has the elasticity or the blood supply of the original tissue → the edges of a scar are prone to re-injury. Which is why you must wait for full healing before loading it hard again.
What this gives you: ask 'how long has it hurt?' to orient yourself — recent pain, back off; years of pain, lead them into gentle controlled movement and do not let them 'worship' the pain.
A counter-intuitive truth that surprises many teachers — and changes how you cue a whole sequence.
- Many injuries happen NOT while holding the peak pose but in the moment of moving IN and OUT of it — exactly when it is done quickly and vigilance drops.
- Muscle has 'spindle fibres' that sense the SPEED of lengthening: pulled too fast, they fire a signal to CONTRACT → bouncing or jerking to get deeper backfires, and can leave the muscle gripped and torn.
- Warm-up and sequencing: deep hip openers (Pigeon, Half Moon) belong at the END of a session, once the body is warm; muscle injuries come from 'a SUDDEN lengthening without enough warm-up'.
What this gives you: cue the way in and the way out ('slowly, with control, exhale as you lower'), not only the final shape. Build the sequence up in difficulty gradually, and put the deep poses in the second half of the session.
Pain is not measured by the amount of tissue damage: the brain 'constructs' pain out of the danger the signal seems to represent — but pain is still an alarm to be respected, not something to grit through.
The profession's most agonising question: when to let a student stay in, and when to stop them at ONCE. This is a boundary that can be taught.
Practising and teaching safely — turning the risk into a professional strength
Four practical things you can do straight away, even with thirty people:
- 1. Screen first: one minute at the start asking about conditions, injuries and pregnancy. Know who needs to avoid what before you start the sequence.
- 2. Individualise with props: blocks, straps and blankets are not 'for the weak' — they 'bring the floor closer' so a joint can be brought back to NEUTRAL in each particular body. Plenty of people never touch the floor and receive the full benefit.
- 3. Stability before range: build strength and co-contraction first, open deep afterwards. Above all with flexible people — 'making it solid' matters more than 'stretching further'.
- 4. Work all four directions of the spine: rotation, side bending, forward bending, backbending — and back to neutral. A one-directional programme leaves tight regions and weak regions that produce misalignment.
What this gives you: build a 'library of variations' for every risky pose (a base version and a propped version) so you are never caught out by an unfamiliar body.
The most agonised-over question about the boundaries of the profession.
- The risk: a hand on someone can push them past their REAL limit (which you cannot feel from outside) → causing a tear or a strain. Quite apart from the question of consent and bodily boundaries.
- The safety principle: prefer correcting with WORDS and with props first; if you do touch, you must ASK PERMISSION, and touch lightly to SUGGEST a direction rather than pressing anyone deeper; never use your own body weight to press a student into a shape.
- With anyone hypermobile or in pain → keep hands-on deepening to an absolute minimum.
What this gives you: make 'words plus props' your default, treat hands-on as the last resort, and always with consent.
Gathering the whole lesson together: injury in yoga does not come from one bad pose, but from the MISMATCH between 'one template for everybody' and a real body.
- The positive promise: yoga is demonstrably effective for joint degeneration and arthritis — there is research recording a considerable reduction in pain after a few weeks. The therapeutic power is REAL.
- What decides between 'healing' and 'harming' is precisely: screening, individualisation, sequencing, warm-up, stability before range, and respect for limits — exactly what the mass-market class leaves out.
- This is why an approach built around screening and rehabilitation was designed specifically to patch that mismatch, instead of chasing depth.
What this gives you: the applied anatomy, and the system of screening and variations, are usually very thin in a basic teacher training — if you want to study it deeply enough to hold a large class safely, this is the missing piece that lets you teach without harming anyone. The lessons that follow go region by region in exactly that spirit.
The aim is not a perfect asana — it is 'first, do no harm' (ahimsa). That is at once yoga's founding philosophy and medicine's oath.
The same power: yoga strong enough to heal is strong enough to harm. What decides it is screening, individualisation, stability before range, and respect for each body's limits.
You have just seen the map of the five injury-prone regions — but the region blamed most, and misunderstood most, is the LOWER BACK. Why does the same forward fold rescue one person and push another towards a herniated disc? What does the L5–S1 disc actually 'endure' every time we bend down to the floor? The next lesson dissects it right down to the disc itself and the hamstring–pelvis–lumbar chain, so you know exactly which cue is quietly grinding your students' backs away — and how to correct it in a single sentence.
To unlock Lesson 9
Answer all three correctly to unlock Lesson 9.
1. What are the four walls of the “core canister”?
2. On the IN-BREATH, how do the diaphragm and the pelvic floor move?
3. Engaging the core PROPERLY means:
The road — 31 lessons · 4 stages
You are on Lesson 8. Each lesson opens one real question about the body — understand it, and you practise & teach that much more soundly.
- 1The spine — the axis of all movementAvailable
- 2The six directions the spine movesAvailable
- 3Which muscles each spinal direction uses (SHORTENING ↔ LENGTHENING)Available
- 4Why years of practice still won't get you into the lotus (tension vs compression)Available
- 5Every joint its own kind of hinge (bone – joint – cartilage – ligament)Available
- 6Muscle, tendon, fascia: the factory that makes & transmits forceAvailable
- 7Does stretching really make a muscle "longer"?Available
- 8The core is an "inflatable corset" — breath · diaphragm · pelvic floorAvailable
- 9One shape at the foot frees the shoulder (fascia)Available
- 10Why one cue produces a different shape in every bodyAvailable
- 11Reading the body as a system of forces (putting it together)Available
By the root principle of this lesson, what is the real culprit when mass-market yoga leaves a client in more pain?