Shoulder Circle（肩圈）, Kua Circle（胯圈）, and Waist circle（腰圈）
In Taijiquan, the shoulder circle（肩圈）, kua circle（胯圈）, and waist circle（腰圈） should not move independently. They form three connected circles:
The feet create the root（根） → the kua transforms the force（胯化） → the waist directs it（腰帶） → the shoulder transmits it（肩傳） → the hand expresses it（形於手）.
The circles may be horizontal, vertical, or oblique, depending on the application. They are usually small and internal—not exaggerated external rotations.
The function of the three circles
| Circle | Main function |
|---|---|
| Kua circle 胯圈 | Sinks, folds, opens, shifts weight, and receives force from the ground |
| Waist circle 腰圈 | Changes direction and coordinates the left and right sides |
| Shoulder circle 肩圈 | Connects the torso to the arm while keeping the shoulder relaxed |
| Combined circles 三圈相連 | Produce whole-body spiralling power, 纏絲勁／螺旋勁 |
Here, waist（腰） does not mean twisting the lower back by itself. The waist, pelvis, ribs and spine rotate as an integrated unit, protecting the lumbar spine.
Application in the Eight Energies 八法
| Energy | Kua circle 胯圈 | Waist circle 腰圈 | Shoulder circle 肩圈 |
|---|---|---|---|
| Peng 掤 | The kua sinks and opens, 沉胯、開胯 | The waist expands and turns slightly outward | The shoulder rolls outward and slightly upward while remaining sunk, 沉肩 |
| Lu 捋 | One kua folds while the other opens, receiving the opponent | The waist turns in a smooth backward arc | The shoulder rolls back and down without pulling with the arm |
| Ji 擠 | The rear kua presses into the ground and closes toward the centre | The waist turns and gathers force toward the middle | The shoulders circle forward and inward as the two arms converge |
| An 按 | The kua first sinks, then opens or extends | The waist makes a small downward-forward arc | The shoulders sink first, then roll forward and down |
| Cai 採 | The kua sinks and turns, controlling the opponent’s root | The waist spirals diagonally downward | The shoulder circles down as the hand plucks; the hand must not pull alone |
| Lie 挒 | The two kua circles work oppositely, one closing and one opening | The waist turns between two opposing directions | The shoulders separate along two different arcs, producing splitting force |
| Zhou 肘 | The kua closes and brings the body within elbow distance | The waist rotates the torso behind the elbow | The shoulder circles to position the elbow; power is not produced by the elbow alone |
| Kao 靠 | The kua enters, opens and stabilises the body | The waist aligns the torso with the opponent | The shoulder circle becomes very small; the entire body issues through the shoulder, back or chest |
1. Peng 掤
In Peng, the kua sinks and opens. The waist turns slightly, while the shoulder rolls outward without rising.
Think:
Sink below, expand above — 下沉上掤.
Peng is not lifting with the shoulder. It is an elastic expansion supported by the legs and kua.
2. Lu 捋
In Lu, do not pull the opponent with your hands. Fold one kua, open the other and turn the waist. The shoulder follows a backward-downward circle.
Think:
The kua receives, the waist redirects, and the hands accompany — 胯接、腰化、手隨.
This allows the opponent’s force to pass beside your centre instead of entering it.
3. Ji 擠
After Lu, the rear kua presses into the ground. The waist returns toward the centre, and the shoulders form a small forward-inward circle.
Think:
Gather, connect and issue through the centre — 合、連、中發.
The arms appear to squeeze, but the real power comes from the rear foot, kua and waist.
4. An 按
An contains a vertical circle. First sink the kua and shoulders to receive the force; then allow the kua, waist and shoulders to roll forward together.
Think:
Receive downward, return forward — 下接前發.
If you push directly with the arms, it becomes muscular force rather than An-jin（按勁）.
5. Cai 採
Cai is a diagonal downward spiral. The kua sinks and turns, the waist leads down and sideways, and the shoulder follows.
Think:
Do not pull the branch; uproot the tree — 不拉其梢，要拔其根.
Your hand controls one point, but your kua and waist disturb the opponent’s root.
6. Lie 挒
The correct character is 挒（Lie）, sometimes mistakenly written as 列. Lie uses two opposing circles.
For example:
One kua closes while the other opens.
The waist rotates through the centre.
One shoulder moves forward while the other moves backward.
This creates opposing spiral force（對拉螺旋勁）, like twisting and separating a wet towel.
7. Zhou 肘
The elbow becomes effective only after the kua and waist bring it into the correct distance. The shoulder remains relaxed and circles just enough to position the elbow.
Think:
The body delivers the elbow; the elbow does not strike alone — 身送肘，不以肘獨打.
Over-rotating the shoulder will disconnect the elbow from the back and kua.
8. Kao 靠
In Kao, the kua enters the opponent’s space and establishes the root. The waist aligns the torso, while the shoulder circle becomes compact.
Think:
Enter with the kua, align with the waist, issue through the body — 胯進、腰合、身發.
Kao is not simply bumping with the shoulder. The shoulder or back is merely the final contact point of whole-body power.
The essential principle
The three circles should become one continuous spiral（圈圈相連，一氣貫串）:
Kua circle controls sinking and weight.
Waist circle controls direction.
Shoulder circle controls transmission.
The hand only completes the movement.
A useful practice formula is:
胯先鬆沉，腰隨之轉，肩隨腰走，手隨肩行。
The vertical circles（立圈） of the shoulders, waist, and kua are coordinated oval movements in a vertical plane. They are not exaggerated rotations or deliberate bending of the spine.
Think of them as three connected wheels:
Kua circle（胯圈）: receives weight, sinks, folds, and generates power.
Waist circle（腰圈）: changes direction and coordinates the body.
Shoulder circle（肩圈）: transmits whole-body power into the arms.
The movement follows:
Receive → Sink → Transform → Issue接 → 沉 → 化 → 發
Four phases of a vertical circle
1. Receive（接）
As the opponent’s force arrives:
Relax and fold the front kua: 鬆胯、折胯
Allow the centre to move slightly backward and downward.
Sink the shoulder blades: 沉肩
Let the elbows remain heavy: 墜肘
Keep the tailbone centred: 尾閭中正
Do not pull backward with your arms.
2. Sink（沉）
Allow the incoming force to settle toward the ground:
The kua continues along the downward part of the circle.
The lower back remains relaxed.
The Mingmen（命門） gently opens.
The pressure settles through the feet: 落地生根
This is the bottom of the vertical circle.
3. Transform（化）
At the bottom, the direction changes:
Ground force begins to return through the legs.
The rear kua rolls forward.
The waist guides the centre from backward-downward to forward.
The shoulders follow the waist without becoming tense.
This is where neutralisation changes into issuing:
Neutralise first, then issue — 先化後發.
4. Issue（發）
The force travels outward:
The rear foot connects with the ground.
The kua opens and moves forward.
The waist carries the torso.
The shoulder blades glide outward without lifting the shoulders.
The elbows, wrists and hands express the force last.
The sequence is:
Feet → Kua → Waist → Shoulder → Hand腳 → 胯 → 腰 → 肩 → 手
How the three circles cooperate
| Body circle | Receiving phase | Issuing phase |
|---|---|---|
| Kua circle 胯圈 | Folds, sinks and receives weight | Opens and carries power forward |
| Waist circle 腰圈 | Guides the centre backward and downward | Redirects the centre forward |
| Shoulder circle 肩圈 | Sinks and receives through the back | Glides forward and outward |
| Arms 手臂 | Maintain contact without resisting | Express the body’s force |
The kua begins the transformation, the waist directs it, and the shoulder transmits it. However, externally they should appear to move as one integrated action:
When one part moves, every part moves — 一動無有不動.
Vertical circles in the Eight Energies
Peng（掤）
Peng generally follows the upward-forward portion of a vertical circle:
The kua sinks and opens.
The waist moves from backward-downward toward forward-upward.
The shoulder blades spread gently.
The arms expand without lifting the shoulders.
The body sinks while Peng rises — 身沉勁升.
Lu（捋）
Lu follows a backward-downward arc:
The front kua folds.
The waist turns backward and downward.
The shoulder follows the waist.
The hands maintain contact without pulling.
Receive with the kua; redirect with the waist — 胯接、腰化.
Ji（擠）
Ji comes from the bottom of the circle toward the centre and forward:
The rear kua connects to the ground.
The waist gathers toward the centre.
The shoulders circle slightly forward and inward.
The forearms express the united force.
Ji is not produced by squeezing the arms together.
An（按）
An clearly demonstrates a vertical circle:
Sink the kua, waist and shoulders.
Receive the opponent’s force.
Turn around the bottom of the circle.
Allow the waist to move forward.
Let the shoulders and hands follow forward and slightly downward.
Sink first, then issue — 先沉後發.
Cai（採）
Cai uses a diagonal downward vertical circle:
The kua sinks and turns.
The waist leads diagonally downward.
The shoulder follows the body.
The hand controls the opponent without pulling independently.
The body’s circle disturbs the opponent’s root: 拔根.
Lie（挒）
Lie uses opposing vertical circles:
One shoulder moves forward and upward.
The other moves backward and downward.
One kua opens while the other closes.
The waist rotates between the opposing forces.
This produces opposing spiral force（對拉螺旋勁）.
Zhou（肘）
In elbow energy:
The kua carries the body into close range.
The waist turns from below and behind the elbow.
The shoulder sinks and positions the elbow.
The whole body delivers the elbow.
The body sends the elbow; the elbow does not strike alone — 身送肘，不以肘獨打.
Kao（靠）
Kao uses a short, compact vertical circle:
The kua sinks and enters.
The waist aligns the torso.
The shoulder circle becomes small.
Whole-body force is expressed through the shoulder, back, or chest.
Enter with the kua, direct with the waist, and issue through the body — 胯進、腰帶、身發.
Simple practice drill
Stand in a comfortable bow stance:
Fold the front kua and sink slightly backward.
Keep the head suspended: 虛領頂勁.
Allow the centre to move around the bottom of an oval.
Connect the rear foot to the ground.
Let the rear kua roll forward.
Allow the waist to carry the shoulders.
Let the hands move last in Peng or An.
Return smoothly along the upper part of the circle.
Begin with a larger, slower movement. Gradually make the external circle smaller while preserving the internal connection:
The external circle becomes small, but the internal circle remains complete — 外圈雖小，內圈仍圓.
The essential relationship is:
The kua is the root, the waist is the axis, and the shoulder is the transmitting end — 胯為根、腰為軸、肩為梢.
When we say:
“My waist circle strikes your waist circle”
“My waist circle strikes your shoulder circle”
“My kua circle strikes your shoulder circle”
the word strike（打） does not necessarily mean that one body part physically hits another. It means that the movement generated by one of my circles enters, intercepts, controls, or destroys the balance of one of your circles.
A better expression is:
My circle enters and disrupts your circle — 我圈入彼圈，破其圓勢。
What is a proper waist circle? 合理的腰圈
A proper waist circle（腰圈） is not simply turning the waist from side to side. It must satisfy several conditions:
The axis remains upright — 中軸不倒
The head remains suspended, the spine stays long, and the body does not lean merely to make a larger circle.
The kua supports the waist — 胯托其腰
The waist circle must originate from the feet and kua. If the kua is locked, the waist is only twisting the lumbar spine.
The Mingmen remains open — 命門開
The lower back is relaxed and expanded rather than compressed.
The shoulders follow the waist — 肩隨腰轉
The shoulders do not turn first or move independently.
The circle can change its plane — 圈可變向
A functional waist circle can change between:
Horizontal circle（平圈）
Vertical circle（立圈）
Oblique circle（斜圈）
Spiral circle（螺旋圈）
The circle serves the contact — 圈隨點變
You do not continue drawing a predetermined circle. Your circle changes according to the opponent’s direction, timing and point of contact.
Therefore:
A reasonable waist circle is centred, rooted, connected, adaptable and appropriately small.合理之腰圈，須中正、有根、相連、能變而不過大。
What does “circle against circle” mean?
Each circle has a centre, an axis, a direction and a phase:
Centre（圓心）
Axis（圓軸）
Direction（圓勢）
Timing or phase（時機／圈位）
To defeat the opponent’s circle, you do not collide with its strongest point. You touch its edge, follow its direction briefly, and then change its centre or axis.
Do not collide with the circumference; control the centre — 不抗其圓周，要制其圓心。
This is similar to touching a turning wheel tangentially rather than pushing directly against its rim.
1. My waist circle against your waist circle
我腰圈打你腰圈
This is centre against centre（中圈對中圈）.
Suppose the opponent turns his waist to issue Ji（擠） or An（按）. Through the point of contact, I sense the direction of his waist circle.
I then:
Relax my kua: 鬆胯
Preserve my central axis: 守中
Follow his direction for a very short moment: 順勢
Turn my waist circle inside or across his circle.
Change the axis of his waist before his circle is completed.
The important point is timing:
Enter while his old circle is ending and his new circle has not yet formed — 舊力已盡，新力未生。
If our waist circles collide head-on, the stronger or heavier person may win. That is not refined Taijiquan. Instead, I should use an oblique or tangential circle to make his waist turn around my centre, rather than allowing my centre to follow his.
Possible energies include:
Lu（捋） to redirect his waist circle
Lie（挒） to split its axis
Ji（擠） to occupy its centre
Kao（靠） to enter after his centre is exposed
The goal is not merely to turn him. It is to make his upper and lower body lose coordination:
Separate his waist from his kua — 使其腰胯相離。
2. My waist circle against your shoulder circle
我腰圈打你肩圈
This means using my central circle to control his upper or peripheral circle:
Use the centre to control the extremity — 以中制梢。
Suppose the opponent pushes with his right arm. His shoulder forms a shoulder circle, but that shoulder circle should be connected to his waist.
I contact his forearm, elbow or upper arm. Then:
My hands maintain contact without gripping.
My kua sinks and provides the root.
My waist turns in a vertical, horizontal or oblique circle.
My shoulder and arm transmit that circle to the contact point.
His shoulder is carried away from his waist and centre.
My waist does not physically touch his shoulder. The waist circle travels through my connected arm:
Waist → back → shoulder → elbow → hand → opponent’s shoulder腰 → 背 → 肩 → 肘 → 手 → 彼肩
Once his shoulder circle becomes separated from his waist circle, his arm may still move, but it no longer has whole-body power.
This is:
Break the shoulder–waist connection — 斷其肩腰之連。
Examples include:
Waist turns backward-downward to produce Lu（捋）
Waist turns diagonally downward to produce Cai（採）
Waist divides into opposing directions to produce Lie（挒）
Waist turns forward through the contact to produce Ji（擠）
Your waist circle is larger and more central than his isolated shoulder circle. However, this advantage exists only if your waist remains connected to your kua and feet.
3. My kua circle against your shoulder circle
我胯圈打你肩圈
This is lower circle controlling upper circle（以下制上）.
The kua is close to the body’s root, while the shoulder is higher and farther from the ground. If my kua circle is correctly connected through my torso and arms, I can use a lower, rooted circle to disturb the opponent’s upper structure.
Suppose I have contact with his arm or shoulder:
My kua sinks underneath his force: 胯沉其下
One kua folds while the other opens: 一胯合、一胯開
The ground force returns through my legs.
My kua circle moves forward, upward or diagonally.
The waist and shoulder transmit this movement to his shoulder.
His shoulder is lifted, turned or carried away from his base.
This can create:
Uprooting（拔根）
Tilting the axis（偏軸）
Separating upper and lower body（上下相離）
For example, in Peng:
My kua sinks while my connected structure expands beneath his shoulder.我胯下沉，整體上掤。
The external contact rises, but my internal source is sinking. This creates the Taiji relationship:
Downward inside, upward outside — 內沉外掤。
In Kao, my kua enters his base first. My waist then aligns the body, and the shoulder becomes the final contact point:
The kua attacks his root through my shoulder — 以肩為點，以胯攻根。
Therefore, although it may look like “shoulder against shoulder,” the actual relationship is often:
My kua circle controls his shoulder circle — 我胯圈制彼肩圈。
Why a lower circle can control a higher circle
The circles have a functional hierarchy:
| My circle | Opponent’s circle | Main effect |
|---|---|---|
| Waist circle 腰圈 | Waist circle 腰圈 | Changes his central direction |
| Waist circle 腰圈 | Shoulder circle 肩圈 | Separates his arm from his centre |
| Kua circle 胯圈 | Shoulder circle 肩圈 | Uproots or tilts his entire structure |
| Shoulder circle 肩圈 | Waist circle 腰圈 | Usually weak unless connected to the kua and feet |
| Whole-body circle 整體圈 | Local circle 局部圈 | The connected whole normally controls the isolated part |
A shoulder circle is not automatically weak. If his shoulder remains connected to his waist, kua and feet, then what you are meeting is not merely his shoulder circle—it is his whole-body circle（整體圈）.
The key principle
You should not think:
“My waist is attacking his shoulder.”
Instead, think:
“My rooted central circle is entering his upper circle and changing its axis.”我以有根之中圈，進入彼之上圈，改其圓心與軸線。
Successful circle control depends on five things:
Root（根）
Central axis（中軸）
Connection（整）
Timing（時機）
Angle or tangent（切線／角度）
The refined principle is:
Avoid the strong circumference, enter along the tangent, control the centre, and break the connection.避其圓周之強，循切線而入，制其圓心，斷其連結。
“My waist circle joins your waist circle”（我腰圈合你的腰圈） means that I do not immediately oppose or break your waist movement. Through the contact point, I first match and merge with the direction, speed, rhythm and phase of your waist circle.
It is a process of:
Connect → Join → Lead → Change接 → 合 → 領 → 變
What does “join” mean? 合
He（合） does not mean pressing our waists physically together. It means that my waist movement becomes harmonised with yours, so that for a brief moment our two circles appear to form one common circle（共同之圈）.
Through contact at the hands, wrists, forearms or body:
I sense your waist turning.
My kua relaxes and receives: 鬆胯承接
My waist follows the same general direction.
My shoulders and arms maintain connection: 黏連不斷
I neither resist nor lose contact.
This is:
Your circle moves, and my circle joins its movement — 彼圈動，我圈合。
The four stages
1. Connect（接圈）
First, establish light and sensitive contact.
Your hands should not grip, push or collapse. You listen through touch:
Listening energy — 聽勁
You are trying to sense the source of the opponent’s arm movement. Is it truly coming from his waist and kua, or only from his shoulder?
2. Join（合圈）
When his waist begins turning, your waist turns with it.
To join correctly, you momentarily match:
Direction: 方向
Speed: 速度
Rhythm: 節奏
Pressure: 輕重
Phase of the circle: 圈位
If he turns clockwise, you do not immediately turn against him. You allow your waist circle to enter and accompany his circle.
This is similar to two gears engaging, but without a hard collision.
3. Lead（領圈）
Joining is not passive following. Once the circles are connected, my waist gradually becomes the leading circle.
I may:
Make my circle slightly smaller: 縮圈
Change its centre: 移圓心
Alter its angle: 變角度
Change a horizontal circle into an oblique circle: 平圈變斜圈
Change its speed: 變速
Reverse at the correct moment: 換向
Because the opponent is already connected to my circle, his waist begins to follow my change.
First I follow him; then he follows me — 先隨人，後使人隨我。
4. Change（變圈）
Once I have control of the shared circle, I change its direction to affect his balance.
For example:
Join his forward circle, then lead it downward into Lu（捋）.
Join his turning waist, then make my circle smaller and enter with Ji（擠）.
Join his horizontal circle, then change it into an oblique splitting circle with Lie（挒）.
Join his retreating circle, then continue through his centre with An（按）.
Therefore, 合圈 is usually temporary. If I only follow forever, I surrender control.
My waist circle joining his waist circle
Suppose the opponent uses his waist to push through his right arm.
I contact his arm without resisting.
My front kua folds: 折胯
My waist follows his turning direction.
Our waist circles become synchronised.
I preserve my own centre: 守中
As his circle approaches its weak point, I change the centre or direction.
His waist is drawn into my circle and loses its original axis.
The essential point is:
Join his movement without surrendering your centre — 合其勢而不失我中。
Joining does not mean copying
There is an important difference between following（隨） and being carried away by the opponent.
Incorrect joining:
My centre is pulled by him.
My weight falls outside my feet.
My waist turns farther than my kua can support.
My shoulders move without the kua.
I become dependent on his direction.
Correct joining:
My centre remains stable.
My kua continues to support the waist.
I follow his circumference but protect my centre.
I can change direction at any moment.
His force enters my circle, but does not enter my centre.
The circles join, but the centres remain distinct — 圈合而心不失。
合圈 versus 打圈
| Method | Meaning | Purpose |
|---|---|---|
| 合圈 Joining circles | Match and merge with his movement | Understand, connect and gain control |
| 打圈 Striking/disrupting the circle | Enter and change his circle | Break balance or issue force |
| 領圈 Leading the circle | Make his movement follow yours | Control direction and timing |
| 變圈 Changing the circle | Alter size, plane, axis or speed | Create emptiness and opportunity |
Usually the refined sequence is:
First join his circle, then control his circle; first follow, then change.先合其圈，後制其圈；先隨其勢，後變其勢。
In short, “我腰圈合你的腰圈” means:
My rooted waist circle harmonises with your waist circle through the contact point. I temporarily share your movement, preserve my own centre, and then gradually lead or transform the combined circle.
我以有根之腰圈，經接觸點與彼腰圈相合；不失己中，繼而領之、化之、變之。
Yes. Regardless of which circle engages which circle, you must preserve central integrity（中軸完整）. However, the central axis does not always have to remain perfectly vertical.
The important distinction is between:
An inclined but integrated axis（斜中正）
A bent or collapsed axis（彎腰塌軸）
The first can be correct; the second is usually incorrect.
Must the central axis always be upright?
The classical principle is:
Central, upright, calm and comfortable — 中正安舒.
But upright（中正） does not necessarily mean geometrically vertical. It means that the head, spine, pelvis and supporting leg remain structurally connected.
Three forms are possible:
| Axis | Correct? | Explanation |
|---|---|---|
| Vertical and aligned | Yes | Normal position for receiving, neutralising and turning |
| Inclined as one integrated unit | Yes | The entire body inclines without folding at the waist |
| Locally bent or collapsed | Usually no | The chest, waist or kua loses structural connection |
Thus, you may incline the axis, but you should not break it:
The axis may incline, but it must not collapse — 軸可斜，不可塌。
Can the central axis be bowed? 可弓中軸嗎？
It depends on what you mean by bow（弓）.
1. An elastic body bow — correct
The torso may contain a slight elastic curve called:
Body bow（身弓）
Opening the Mingmen（命門開）
Containing the chest and expanding the back（含胸拔背）
In this condition:
The chest is relaxed but not collapsed.
The Mingmen gently expands.
The kua remains folded and connected.
The crown continues to rise: 虛領頂勁
The spine retains length and elasticity.
The force can travel between the feet and hands.
This bow is a stored elastic relationship, not an obvious hunching of the back.
The body contains a bow, but the axis remains continuous — 身有弓意，軸仍相連。
2. Bending at the waist — incorrect
It is generally incorrect if:
The head falls forward.
The chest collapses.
The lumbar spine folds sharply.
The buttocks protrude backward.
The weight leaves the supporting base.
The shoulders become disconnected from the kua.
You cannot immediately turn or change direction.
That is not a body bow. It is a broken axis（斷軸）.
Vertical axis and functional axis
It is useful to distinguish two ideas:
Vertical axis（垂直中軸）
This is the line around which the body turns during ordinary practice. It helps maintain balance, relaxation and sensitivity.
Functional axis（勁力中軸）
This is the direction through which force travels between the ground, your centre and the contact point. In application, it may be vertical, inclined or oblique.
For example, when issuing Kao（靠）, the body may incline slightly toward the opponent. If the rear foot, kua, spine and shoulder remain on one connected force line, the axis is still functionally correct.
Therefore:
The axis should align with the force, not merely with gravity — 中軸須合於勁線，不只求外形垂直。
When circles meet
Whether it is:
Waist circle against waist circle
Waist circle against shoulder circle
Kua circle against shoulder circle
Shoulder circle joining another shoulder circle
your axis must perform three functions:
Preserve your centre — 守中
Transmit force to the ground — 勁沉於根
Remain free to change — 中軸能變
If you bend so much that you cannot change direction, your axis has been captured by the opponent.
A useful principle is:
My circles may change, but my centre must not be lost — 圈可變，中不可失。
Examples in the Eight Energies
Lu（捋）
During Lu, the body may incline slightly backward or sideways. This is acceptable if the kua folds and the whole axis moves together.
Incorrect: the shoulders retreat while the kua remains behind.
Correct:
The kua receives, and the whole axis follows — 胯接而軸隨。
Cai（採）
In Cai, the force travels diagonally downward. You may incline slightly, but do not bend forward from the waist. Sink through the kua and let the entire body form a connected diagonal.
Kao（靠）
Kao often uses an inclined axis. The rear foot, kua, spine and shoulder form one integrated force line.
This is inclined centrality（斜中正）, not leaning helplessly on the opponent.
Peng（掤）
Peng may contain a slight bow in the back, but the head remains suspended and the chest does not collapse. The external structure expands while the centre remains stable.
Four tests for a correct bowed axis
Your bowed or inclined axis is reasonable if:
You can immediately return to vertical without adjusting your feet.
You can change direction without muscular struggle.
Incoming pressure travels through your structure into the ground.
If the opponent suddenly withdraws, you do not fall forward.
The fourth test is particularly important:
Do not depend on the opponent for balance — 不倚不靠.
So, the final answer is:
Yes, the central axis must always remain functionally correct, but it does not have to remain perfectly vertical. It may incline and may contain an elastic bow, provided it remains lengthened, rooted, continuous and independently balanced.
中軸須正，但不必永遠垂直；可以斜，可以含弓，但不可折、不可塌、不可失中。
立圈（vertical circle）是肩、腰、胯在垂直面上形成的橢圓形運動。它不是刻意上下起伏，也不是彎腰挺腰，而是透過鬆胯、沉身、轉腰、沉肩墜肘，使力量走一個「接—沉—轉—發」的循環。
可以把身體想成三個相連的齒輪：
胯圈（Kua circle）：最大、最深，負責沉降、承重及產生力量。
腰圈（Waist circle）：居中，負責轉換方向及傳遞力量。
肩圈（Shoulder circle）：較小，將身體力量送至手臂。
立圈的基本路線
一個完整的立圈，可以分成四個階段：
1. 接 Receive
當對方力量進來：
前胯鬆開、折疊：鬆胯、坐胯
丹田微微向後下方移動
肩胛骨下沉，手臂不僵硬
尾閭保持中正，不可向後翹
這是立圈的後上方進入、向後下方沉落。
2. 沉 Sink
力量沉到腳底：
胯繼續向下走圓弧
腰部放鬆，命門微微展開：命門開
肩下沉，肘尖向下：沉肩墜肘
膝蓋不可向內塌
這是立圈的最低點，稱為落地生根（rooting）。
3. 轉 Convert
在圓圈底部轉換方向：
地面反作用力從腳底返回
後胯開始向前、向上轉
丹田由後下方轉向前方
肩圈隨腰圈轉換，不可先動手
這就是**化勁轉為發勁（化而後發）**的地方。
4. 發 Issue
力量由地面傳到手：
後腳蹬地，但不可僵直
胯向前開展
腰帶動胸背整體向前
肩胛骨向外滑動，但肩頭仍保持下沉
最後才到肘、腕、手
順序是：
力起於腳，主宰於腰，發於胯，傳於肩，形於手。Power begins at the feet, is directed by the waist, generated through the kua, transmitted through the shoulder, and expressed in the hands.
肩、腰、胯如何配合
| 部位 | 接勁時 | 發勁時 |
|---|---|---|
| 胯圈 | 折胯、鬆沉、承接重量 | 從腳底轉出，向前開胯 |
| 腰圈 | 丹田向後下方走弧線 | 丹田由下向前轉出 |
| 肩圈 | 肩胛下沉、向後或向內收合 | 肩胛向外滑動，力量傳至手臂 |
| 手臂 | 保持圓滿，不抗力 | 隨身體發出，不主動推擠 |
三個圈不是同樣大小，也不是完全同時轉：
胯先鬆沉 → 腰接續轉化 → 肩隨腰傳出 → 手最後表現。
但外觀上應當是一個完整動作，即一動無有不動（whole-body movement）。
在八法中的立圈運用
掤 Peng
掤的立圈多為由下向前上方：
胯先沉，取得地面支撐。
腰圈由後下轉向前上。
肩胛向外展開，手臂形成圓弧。
不是用肩把手抬起，而是：
胯沉而掤起，身降而勁升。
捋 Lu
捋的立圈是接住後向下、向後引化：
前胯折疊。
腰圈向後下方轉。
肩圈隨腰向後下沉。
手只是黏住對方，不可以拉扯。
這叫：
以胯接力，以腰引化。
擠 Ji
擠的立圈通常從圈底轉向前方：
胯圈從沉降轉為前進。
腰圈收向中央。
肩圈向前內側合攏。
兩臂只是接觸面，並非靠手臂夾擠。
按 An
按最容易體會立圈：
肩、腰、胯一起鬆沉，接住力量。
胯圈在下方轉換。
腰向前轉出。
肩胛向外、向前滑動。
手掌最後向前下方按出。
因此按勁是：
先沉後發，先蓄後按。
它不是直線推人，而是立圈下半部的下沉—轉換—前發。
採 Cai
採使用斜向下的立圈：
胯沉轉。
腰帶動身體向側下方走弧線。
肩圈下沉。
手將對方的力量帶向地面。
不是用手向下拉，而是讓整個身體的立圈破壞對方重心。
挒 Lie
挒常使用兩個方向相反的立圈：
一側肩向前上方走。
另一側肩向後下方走。
腰圈在中央旋轉。
兩胯一開一合。
形成**上下相錯、前後分開（opposing spirals）**的力量。
肘 Zhou
使用肘法時：
胯圈先將身體送入近距離。
腰圈由下向前轉。
肩圈下沉並定位。
肘隨整體立圈發出。
不可先抬肩、甩肘，否則肩、腰、胯會斷開。
靠 Kao
靠法的立圈較短而緊密：
胯沉入對方根部。
腰圈由下轉向前。
肩或背成為接觸點。
在接觸瞬間，胯、腰、肩同時整合。
它不是肩膀撞人，而是：
以胯進身，以腰催肩，以整體發靠。
一個簡單練習
採前後弓步，雙手如抱球：
吸氣，前胯折疊，身體向後下方鬆沉。
保持頭頂上領：虛領頂勁。
丹田沿著立圈底部轉換。
後腳貼地，後胯向前轉動。
腰圈帶動肩圈向前。
雙手最後隨身體向前掤出或按出。
再沿立圈上半部回到起點。
先練大而慢，熟練後逐漸縮小，最後做到：
外形圈小，內勁圈圓；形雖不顯，勁路不斷。
最重要的是：立圈不是三個部位各自畫圓，而是胯圈為根、腰圈為軸、肩圈為梢。腰椎不可刻意彎折，肩膀不可聳起，身體也不可為了畫圈而上下搖晃。
First relax and sink the kua; the waist turns with it, the shoulder follows the waist, and the hand follows the shoulder.
The movement is initiated internally but should appear externally as one unified action—整體勁, whole-body power.
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