Place · Level 3 · Movement
Core Training
核心不只是腹肌, 是环绕躯干的一整个圆筒; 它的主职是稳住脊柱、传递力量, 不是练出六块腹肌; 六块腹肌是厨房里练出来的, 而核心专项训练也不比一般运动更能治腰痛
Story path
Chapter 1
What the core is
What the core is
In plain words first: many people think core = abs = the six-pack, and grind out crunches chasing a 'flat stomach'. That's a misunderstanding. The core means the entire ring of muscles wrapping the middle of your trunk — like a cylinder (or a soda can), from the bottom of the ribcage down to the pelvis. The site is the whole mid-trunk, not just the front layer of the belly.
Its real job is two things, neither of which is 'growing a six-pack':
1. Stabilise the spine: so that when you bend to lift, get shoved, or stand on one leg, the spine doesn't wobble or collapse. It's more like the guy-wires around a mast than an engine that produces movement
2. Transmit force: when you run, jump, throw, or lift, force is generated at the ground through the legs and hips and must pass through the trunk to reach the arms or an opponent. If the middle is soft, force leaks out; only if the middle is stiff does force transmit efficiently
In other words, the core's real role is to be a solid bridge that lets force cross efficiently from the lower body to the upper (McGill 2010). The rectus abdominis (the six-pack) is just a small part of the front wall of this cylinder — and how visible it is depends mainly on your body fat, not on how many crunches you did.
The first intuition this island builds: training the core trains stability and force transmission, not sculpting abs. Separate those two ideas and every myth ahead becomes easy to dismantle.
Its real job is two things, neither of which is 'growing a six-pack':
1. Stabilise the spine: so that when you bend to lift, get shoved, or stand on one leg, the spine doesn't wobble or collapse. It's more like the guy-wires around a mast than an engine that produces movement
2. Transmit force: when you run, jump, throw, or lift, force is generated at the ground through the legs and hips and must pass through the trunk to reach the arms or an opponent. If the middle is soft, force leaks out; only if the middle is stiff does force transmit efficiently
In other words, the core's real role is to be a solid bridge that lets force cross efficiently from the lower body to the upper (McGill 2010). The rectus abdominis (the six-pack) is just a small part of the front wall of this cylinder — and how visible it is depends mainly on your body fat, not on how many crunches you did.
The first intuition this island builds: training the core trains stability and force transmission, not sculpting abs. Separate those two ideas and every myth ahead becomes easy to dismantle.
Chapter 2
How the canister works
How the canister works
Picture the core as a pressurisable canister, with six faces each doing a job:
The walls (all around): the innermost layer is the transverse abdominis, a corset-like band running horizontally around; outside it are the internal and external obliques, crossing diagonally; front and centre is the rectus abdominis (the six-pack). Hugging the spine at the back are deep muscles like the multifidus, stabilising the vertebrae segment by segmentThe lid (top): the diaphragm — both the main breathing muscle and the top of the canisterThe floor: the pelvic floor, supporting from below
How does this canister stabilise the spine? By two mechanisms:
1. Anti-movement: most of the time the core muscles' job isn't to produce movement but to prevent unwanted movement — anti-extension (don't let the low back sag), anti-rotation (don't let the trunk be twisted), anti-lateral-flexion (don't let the body be bent sideways). McGill repeatedly stresses that the core muscles' main role is to stiffen the torso and prevent motion, not to flex and extend like a biceps (McGill 2010)
2. Intra-abdominal pressure: contracting the canister walls in concert with breathing raises the pressure inside the abdomen — like inflating the can — bracing the spine from within. This is the principle of 'bracing the core' when lifting something heavy
So a truly functional core is this whole canister working in concert, not just the front-wall six-pack trained in isolation. The next page explains a key distinction: 'bracing' and deliberately 'sucking the belly in' (hollowing) are not the same thing.
The walls (all around): the innermost layer is the transverse abdominis, a corset-like band running horizontally around; outside it are the internal and external obliques, crossing diagonally; front and centre is the rectus abdominis (the six-pack). Hugging the spine at the back are deep muscles like the multifidus, stabilising the vertebrae segment by segmentThe lid (top): the diaphragm — both the main breathing muscle and the top of the canisterThe floor: the pelvic floor, supporting from below
How does this canister stabilise the spine? By two mechanisms:
1. Anti-movement: most of the time the core muscles' job isn't to produce movement but to prevent unwanted movement — anti-extension (don't let the low back sag), anti-rotation (don't let the trunk be twisted), anti-lateral-flexion (don't let the body be bent sideways). McGill repeatedly stresses that the core muscles' main role is to stiffen the torso and prevent motion, not to flex and extend like a biceps (McGill 2010)
2. Intra-abdominal pressure: contracting the canister walls in concert with breathing raises the pressure inside the abdomen — like inflating the can — bracing the spine from within. This is the principle of 'bracing the core' when lifting something heavy
So a truly functional core is this whole canister working in concert, not just the front-wall six-pack trained in isolation. The next page explains a key distinction: 'bracing' and deliberately 'sucking the belly in' (hollowing) are not the same thing.
Mechanism: bracing vs hollowing
Two ways of 'engaging the core' are often conflated; telling them apart helps you understand the myths ahead.Abdominal hollowing: deliberately drawing the navel toward the spine, isolating and tightening only the deepest transverse abdominis. This was once a very popular prescription (born from transverse-abdominis research, covered two scenes on), leading people to believe they 'must first isolate-activate the TrA' to protect the back.
Bracing: as if bracing to take a punch, tightening the whole canister (TrA + obliques + rectus + back muscles) moderately and together to steady the trunk.
McGill's experiments and view hold that in real loading and movement, whole-canister bracing provides more spinal stability than deliberate hollowing, because stability comes from the combined stiffness of all the canister walls, not from tightening one deep muscle in isolation (McGill 2010). Deliberately 'isolating the TrA' is measurable in a lab but impractical at the moment you lift a box or a barbell — the brain automatically recruits the whole canister.
This matters because it dismantles a popular prescription ('to train the core you must first learn to activate the TrA') and foreshadows a later scene: many of the fine-grained 'core stability' dogmas are, against the evidence, no better than just training well overall.
What this means for you: learning whole-body bracing (imagine bracing for a poke to the belly) and using it when lifting heavy is far more practical than fussing over 'did I isolate the TrA'.
Chapter 3
Myths
Myths
The core is a disaster zone of fitness marketing. This scene weighs each myth against the evidence.
Myth 1: 'Hammering the abs burns off belly fat (spot reduction)'
One of the most stubborn illusions in fitness. A randomised controlled trial had participants do 6 weeks of abdominal training without changing their diet — and abdominal fat did not decrease at all (Vispute 2011). The reason is simple: a contracting muscle doesn't preferentially burn the fat directly above it; fat is mobilised whole-body, driven by total energy deficit. So the old line is right — a six-pack is made in the kitchen: to see your abs, the key is lowering whole-body fat (through diet + overall exercise), not crunching to exhaustion. This gets its own page.
Myth 2: 'A weak core is the root of back pain; a strong core cures everything'
Half-true, but its strong version ('you must have an especially strong core to avoid back pain') isn't supported by the evidence — the next scene is devoted to it.
Myth 3: 'Sit-ups / crunches are the king of core training'
A crunch only trains flexion of the front wall (the rectus doing movement) — precisely NOT the core's real jobs of anti-rotation, anti-extension, and force transmission. Worse: repeatedly making the spine flex through a large range can repeatedly load the disc, which is why McGill recommends replacing endless crunches with anti-movement drills (McGill 2010).
Myth 4: 'You must first learn to isolate-activate the transverse abdominis to protect your back' — dismantled on the previous page: in real movement the brain recruits the whole canister automatically, and whole-body bracing is more practical than deliberate hollowing. The next scene traces where this prescription came from.
Myth 1: 'Hammering the abs burns off belly fat (spot reduction)'
One of the most stubborn illusions in fitness. A randomised controlled trial had participants do 6 weeks of abdominal training without changing their diet — and abdominal fat did not decrease at all (Vispute 2011). The reason is simple: a contracting muscle doesn't preferentially burn the fat directly above it; fat is mobilised whole-body, driven by total energy deficit. So the old line is right — a six-pack is made in the kitchen: to see your abs, the key is lowering whole-body fat (through diet + overall exercise), not crunching to exhaustion. This gets its own page.
Myth 2: 'A weak core is the root of back pain; a strong core cures everything'
Half-true, but its strong version ('you must have an especially strong core to avoid back pain') isn't supported by the evidence — the next scene is devoted to it.
Myth 3: 'Sit-ups / crunches are the king of core training'
A crunch only trains flexion of the front wall (the rectus doing movement) — precisely NOT the core's real jobs of anti-rotation, anti-extension, and force transmission. Worse: repeatedly making the spine flex through a large range can repeatedly load the disc, which is why McGill recommends replacing endless crunches with anti-movement drills (McGill 2010).
Myth 4: 'You must first learn to isolate-activate the transverse abdominis to protect your back' — dismantled on the previous page: in real movement the brain recruits the whole canister automatically, and whole-body bracing is more practical than deliberate hollowing. The next scene traces where this prescription came from.
Myth 1: why spot reduction is impossible
Spot reduction gets its own page because it robs countless people of time and money every year ('7-day slim waist', 'fat-burning crunches', and the like).Evidence: Vispute 2011 is a direct randomised controlled trial — one group did 6 weeks of abdominal training without changing their diet, then abdominal fat was measured precisely. The result: abdominal fat, body-fat percentage, and waist circumference showed no significant change. The abs got stronger, but the fat over them didn't budge.
Mechanism: why can't training a body part reduce fat at that part?
To be used, fat must first break down into fatty acids, enter the blood, and be burned as fuel by tissues all over the body — a whole-body process governed by hormones and total energy deficitA contracting muscle does not preferentially mobilise the fat directly above it; however hard your abs work, fat is mobilised from all over the body togetherWhere fat comes off first and where it's stubborn is set mainly by genes and hormones, not by which muscle you train
So the right path:
1. To see your abs = lower whole-body fat. The main levers are diet (a gentle energy deficit + adequate protein) + overall exercise (strength training to keep muscle + daily activity)
2. Keep doing core training, but for stability and force transmission, not to 'melt the belly'
3. Don't pay for 'localised fat-burning' products and classes — mechanistically the idea doesn't hold
In one line: abs are built by training, but VISIBLE abs come from whole-body fat loss. Separate those two and you'll stop being led around by 'spot-slimming' marketing.
Chapter 4
Does core-specific training win?
Does core-specific training win?
This scene tackles the biggest claim in core training: back pain comes from an unstable core, so specialised core-stability training cures and prevents it. Looked at honestly, this claim is greatly exaggerated.
Where did the idea come from?
The starting point is a classic study: Hodges and Richardson 1996 found that in low-back-pain patients, the deep transverse abdominis activated with a delay during arm movement (Hodges 1996). The finding itself is reliable, but it was then extrapolated into a whole industry: 'back pain = the TrA doesn't fire in time = you must do special training to retrain it' — that leap went too far.
Who poured cold water on it?
Lederman's famous 2010 paper 'The myth of core stability' criticised this extrapolation point by point:
Spinal stability comes mainly from intra-abdominal pressure and whole-muscle coordination, not from one isolated transverse abdominisIn real life, deliberately 'isolating and activating' a single deep muscle is neither practical nor necessaryHaving an especially strong, especially well-activating core is not a prerequisite for avoiding back pain — plenty of people with strong cores still get back pain, and plenty with 'weak cores' are fine for life
What does the harder evidence (controlled trials) say?
A Cochrane systematic review compared motor-control / core-stability training with other forms of exercise: it concluded that core-specific training is effective for chronic non-specific back pain but not superior to other forms of exercise (Saragiotto 2016). That is: exercise helps, but 'core-specific' has no magic — general activity (walking, strength, swimming, Pilates) works about as well.
What this means for you: don't put faith in some special 'core rehab routine'. Choosing a form of exercise you'll stick with long-term is the key — because adherence is the variable that truly decides back-pain outcomes.
Where did the idea come from?
The starting point is a classic study: Hodges and Richardson 1996 found that in low-back-pain patients, the deep transverse abdominis activated with a delay during arm movement (Hodges 1996). The finding itself is reliable, but it was then extrapolated into a whole industry: 'back pain = the TrA doesn't fire in time = you must do special training to retrain it' — that leap went too far.
Who poured cold water on it?
Lederman's famous 2010 paper 'The myth of core stability' criticised this extrapolation point by point:
Spinal stability comes mainly from intra-abdominal pressure and whole-muscle coordination, not from one isolated transverse abdominisIn real life, deliberately 'isolating and activating' a single deep muscle is neither practical nor necessaryHaving an especially strong, especially well-activating core is not a prerequisite for avoiding back pain — plenty of people with strong cores still get back pain, and plenty with 'weak cores' are fine for life
What does the harder evidence (controlled trials) say?
A Cochrane systematic review compared motor-control / core-stability training with other forms of exercise: it concluded that core-specific training is effective for chronic non-specific back pain but not superior to other forms of exercise (Saragiotto 2016). That is: exercise helps, but 'core-specific' has no magic — general activity (walking, strength, swimming, Pilates) works about as well.
What this means for you: don't put faith in some special 'core rehab routine'. Choosing a form of exercise you'll stick with long-term is the key — because adherence is the variable that truly decides back-pain outcomes.
In detail: a real finding overextended into a dogma
This page tells the full story of 'from Hodges to Lederman', because it's a classic case of how a scientific finding gets distorted by marketing — perfect training for your judgement.Step 1 (a reliable finding): Hodges 1996 measured, in an experiment, that the transverse abdominis fired slightly later in back-pain patients than in pain-free people during arm movement. This is real, and hints that back pain may come with altered motor control.
Step 2 (a reasonable hypothesis): perhaps training the timing and coordination of this deep stabiliser could help some back-pain patients. This step is still reasonable.
Step 3 (overextension): from there, a whole dogma sprang up — 'everyone must first learn to isolate the TrA', 'core instability is the universal cause of back pain', 'you must do a special routine to be safe'. This step skipped the evidence.
Lederman 2010 called a halt right here. He pointed out that taking a correlational finding (back-pain patients' TrA fires a bit late) as a causal, universal prescription (so everyone must train it, and isolate it) is supported by neither logic nor evidence — spinal stability is a redundant, robust system that doesn't collapse because one muscle was tens of milliseconds late (Lederman 2010).
This is not to say core training is useless. It's to say:
Core training is one of many effective exercises, not 'the one correct answer'A strong core is worth training (good for performance and overall health), but don't treat it as a 'talisman against back pain'When you meet absolutist claims like 'only this core routine can heal your back', you now have the ability to judge: it has turned a real finding into an overblown story
This is exactly what the product's soul wants to give you: know the origin and reasoning of a mechanism, and you won't be easily led astray by 'scientific-looking' marketing.
Chapter 5
How to build a functional core
How to build a functional core
Having covered 'what not to do', here's 'what to do'. Since the core's real job is stability + force transmission, training should orbit those two things, not the six-pack.
Foundation · Big compound lifts are already heavy core training
Many don't realise it: squats, deadlifts, overhead presses, and loaded carries all require the core to brace throughout to stabilise the spine and transmit force — they are, in fact, high-intensity core training. So someone who trains compound lifts regularly usually already has a strong core and doesn't need to pile on isolated ab drills.
Targeted · Train 'anti-movement', not 'making movement'
Because the core's job is to prevent unwanted movement, the most on-target exercises are anti-movement ones:
Anti-extension: the plank, the dead bug — training 'don't let the low back sag'Anti-lateral-flexion: the side plank, the suitcase carry — training 'don't get bent sideways'Anti-rotation: the Pallof press, farmer's carries, single-side lifts — training 'don't get twisted'
These train the core's true skill, and most don't require repeated large spinal flexion, fitting the core's function better than endless crunches (McGill 2010). McGill has a beginner 'big three' (the modified curl-up, the side bridge, the bird dog), stressing endurance and stability over 'how many reps'.
How to program it (for a general audience)
Prioritise 2-3×/week of solid compound strength training — it already covers most core needsAdd 5-10 minutes of anti-movement work each session (a few sets each of plank / side plank / dead bug / carries), chasing a stable, sustainable position, not numbersDon't train only the front: anti-rotation and the back side matter equally — keep the canister walls balanced
The next page gives a ready-to-follow sample and spells out the limits of McGill's perspective.
Foundation · Big compound lifts are already heavy core training
Many don't realise it: squats, deadlifts, overhead presses, and loaded carries all require the core to brace throughout to stabilise the spine and transmit force — they are, in fact, high-intensity core training. So someone who trains compound lifts regularly usually already has a strong core and doesn't need to pile on isolated ab drills.
Targeted · Train 'anti-movement', not 'making movement'
Because the core's job is to prevent unwanted movement, the most on-target exercises are anti-movement ones:
Anti-extension: the plank, the dead bug — training 'don't let the low back sag'Anti-lateral-flexion: the side plank, the suitcase carry — training 'don't get bent sideways'Anti-rotation: the Pallof press, farmer's carries, single-side lifts — training 'don't get twisted'
These train the core's true skill, and most don't require repeated large spinal flexion, fitting the core's function better than endless crunches (McGill 2010). McGill has a beginner 'big three' (the modified curl-up, the side bridge, the bird dog), stressing endurance and stability over 'how many reps'.
How to program it (for a general audience)
Prioritise 2-3×/week of solid compound strength training — it already covers most core needsAdd 5-10 minutes of anti-movement work each session (a few sets each of plank / side plank / dead bug / carries), chasing a stable, sustainable position, not numbersDon't train only the front: anti-rotation and the back side matter equally — keep the canister walls balanced
The next page gives a ready-to-follow sample and spells out the limits of McGill's perspective.
Clinical: a sample + the limits of McGill's view
A sample for a general audience (2-3×/week, 5-10 min of core work per session)1. Dead bug: lying on your back, slowly extend the opposite arm and leg while keeping the low back on the floor — 2-3 sets × 8-10 per side
2. Side plank: hold 20-40 s per side — 2-3 sets; drop to bent knees to regress if you can't hold it
3. Bird dog: on all fours, slowly extend the opposite arm and leg while keeping the trunk still — 2-3 sets × 8-10 per side
4. Farmer's carry / suitcase carry: carry a moderate load for 20-40 m keeping the trunk level — 2-3 sets
Principles: chase quality you can hold, not quantity; don't hold your breath rigidly; add a little time / load week to week (progressive overload — covered in the resistance-training basics story).
The value and limits of McGill's view (staying honest)
McGill's key contribution was pulling training away from 'endless crunches' toward 'anti-movement + endurance + protecting the spine' — the right, practical direction (McGill 2010). But mark the boundaries:
His advice to 'avoid repeated spinal flexion' comes largely from cadaver-spine and biomechanical models, and does not mean everyone in every situation must strictly avoid bending — a healthy spine is built to bend and to bear flexion load, and over-avoiding bending manufactures fearAs the last scene showed: for back pain, core-specific training is not superior to general exercise (Saragiotto 2016). So this routine is one good choice, not the only right answerStrength training overall has reliable evidence for preventing sports injury (Lauersen 2014), and a strong, load-capable trunk is protective — but that comes from getting stronger overall, not from a magic core drill
To close: training the core trains the ability to stabilise the trunk under load and transmit force out. Build it solidly with anti-movement drills + compound strength, don't put faith in a single prescription, and don't treat bending as taboo.
Chapter 6
Safety & when to get help
Safety & when to get help
For the large majority, core training is a safe, low-barrier, high-value investment. But to close this island, a few safety boundaries and care prompts are worth reading carefully.
General safety principles
Progress gradually: start with lower-level drills you can hold in good position, then add time / load step by step; don't attack the hardest variation on day oneDon't just hold your breath: brief bracing with the breath under heavy load is normal, but ordinary core training shouldn't involve prolonged breath-holding (sustained Valsalva markedly raises blood pressure) — mind this especially with hypertension or cardiovascular diseaseTreat pain as a signal, not a badge: 'a bit hard but not worsening' is fine to continue; 'more painful each session, clearly worse the next day, or pain/tingling radiating to the leg' is the cue to stop and scale back
Consult a professional before training in these cases
Currently have back pain / a history of back injury: you can train, but ideally choose drills and set intensity under a physiotherapist's or doctor's guidance — don't force straight into advanced variationsPregnancy / postpartum: the abdominal wall and pelvic floor have special changes (e.g. diastasis recti) needing targeted adjustment; traditional crunches may not suitOsteoporosis: repeated large spinal-flexion drills (like crunches) may raise the risk of vertebral compression and should be avoided — favour neutral-spine anti-movement drillsPrior spinal surgery or a known spinal condition: ask your doctor first
When to seek care (rather than keep training on your own)
Pain/tingling radiating to the leg or lower-limb weakness during or after training, or steadily worsening back painRare but urgent: saddle numbness (perineum / around the anus / inner thighs) + bladder or bowel dysfunction + progressive weakness in both legs — these are signs of cauda equina syndrome, an emergency; go to the emergency department immediately
This site provides general education and advice — it does not replace a physician's diagnosis and treatment. With persistent pain, a history of injury, or the special situations above, have a qualified doctor or physiotherapist assess you in person before setting a training plan.
General safety principles
Progress gradually: start with lower-level drills you can hold in good position, then add time / load step by step; don't attack the hardest variation on day oneDon't just hold your breath: brief bracing with the breath under heavy load is normal, but ordinary core training shouldn't involve prolonged breath-holding (sustained Valsalva markedly raises blood pressure) — mind this especially with hypertension or cardiovascular diseaseTreat pain as a signal, not a badge: 'a bit hard but not worsening' is fine to continue; 'more painful each session, clearly worse the next day, or pain/tingling radiating to the leg' is the cue to stop and scale back
Consult a professional before training in these cases
Currently have back pain / a history of back injury: you can train, but ideally choose drills and set intensity under a physiotherapist's or doctor's guidance — don't force straight into advanced variationsPregnancy / postpartum: the abdominal wall and pelvic floor have special changes (e.g. diastasis recti) needing targeted adjustment; traditional crunches may not suitOsteoporosis: repeated large spinal-flexion drills (like crunches) may raise the risk of vertebral compression and should be avoided — favour neutral-spine anti-movement drillsPrior spinal surgery or a known spinal condition: ask your doctor first
When to seek care (rather than keep training on your own)
Pain/tingling radiating to the leg or lower-limb weakness during or after training, or steadily worsening back painRare but urgent: saddle numbness (perineum / around the anus / inner thighs) + bladder or bowel dysfunction + progressive weakness in both legs — these are signs of cauda equina syndrome, an emergency; go to the emergency department immediately
This site provides general education and advice — it does not replace a physician's diagnosis and treatment. With persistent pain, a history of injury, or the special situations above, have a qualified doctor or physiotherapist assess you in person before setting a training plan.