13式 Lü (捋) — Roll Back

Lü (捋) — Roll Back（捋）

Definition（定義）

Lü (捋) is one of the Four Primary Energies (四正勁) in Tai Chi.

It is not simply "pulling."

Instead, it means:

Receive incoming force.
Adhere to the opponent.
Guide the force along a curved path.
Lead it into emptiness.
Maintain continuous contact without resisting.

The opponent loses balance because you remove his support rather than overpowering him.

Tai Chi Classics（太極拳論）

The classics repeatedly emphasize the principles behind Lü.

"Neither resist nor let go."

不丟不頂

This is perhaps the most important principle of Lü.

Do not push against the opponent.
Do not lose contact.
Stay connected throughout the movement.

"Lead into emptiness."

引進落空

This describes the essential function of Lü.

Instead of stopping force,

you redirect it,

allowing the opponent to continue moving beyond his own center.

"Four ounces deflect one thousand pounds."

四兩撥千斤

Lü is the clearest expression of this principle.

Rather than matching force with force,

small rotational changes redirect much larger forces.

Biomechanics（生物力學）

Lü is produced by the whole body.

The hands merely transmit the movement.

The sequence is:

Ground Reaction Force（地面反作用力）↓

Feet（腳）↓

Legs（腿）↓

Kua Rotation（胯旋）↓

Waist Rotation（腰旋）↓

Spine（脊柱）↓

Shoulders（肩）↓

Arms（手臂）↓

Hands（雙手）

The hands never pull independently.

Mechanical Characteristics（力學特性）

Lü converts:

Linear Force（直線力）

into

Circular Force（圓弧力）

through

Spiral Rotation（螺旋旋轉）

Instead of opposing the opponent's momentum,

you change its direction.

Body Method（身法）

During Lü:

Relax the shoulders（鬆肩）
Sink the elbows（沉肘）
Rotate the waist（轉腰）
Open and close the kua（開合胯）
Maintain central equilibrium（中定）
Keep the root（落根）

The movement originates in the feet,

not the arms.

The Ancient Character 𢳋 (Hand Radical + 屢)

Many ancient manuals use another character, often written as 𢳋 (hand radical + 屢), instead of 捋.

Although pronounced similarly, the emphasis is slightly different.

Meaning

The ancient character emphasizes

stroking, smoothing, brushing along, or following continuously.

It suggests:

Following the opponent's force.
Maintaining adhesion.
Sliding without interruption.
Continuous yielding.

It stresses continuity more than pulling.

Difference Between 捋 and 𢳋

捋	𢳋 (手+屢)
Roll Back	Continuous Following
Redirect force	Maintain continuous contact
Curved redirection	Sliding along the opponent
Technique	Method of sticking
One of the Eight Energies	Describes the quality of movement

One could say:

捋 describes the Jin (energy).

while

𢳋 describes the method of applying that Jin.

Relationship with Peng（掤）

Peng expands.

Lü receives.

Peng creates structure.

Lü removes structure.

Peng fills.

Lü empties.

The two are inseparable.

The Tai Chi Classics say:

"Peng, Lü, Ji, and An must be understood thoroughly."

Without Peng,

there is no stable Lü.

Without Lü,

Peng becomes rigid.

Teaching Explanation（教學說明）

"Lü is not a pull. It is a whole-body spiral redirection. By maintaining adhesion through continuous contact, the practitioner uses waist rotation, kua rotation, and ground reaction force to guide the opponent's incoming force into emptiness. The hands merely transmit the movement; the power originates from the feet, is controlled by the waist, and is expressed through the hands. The ancient character 𢳋 further emphasizes continuous following and smooth adherence, reminding us that Lü is achieved by connection rather than by muscular pulling."

A small terminology suggestion for your WTCCF manual

Instead of translating 捋 simply as Roll Back, I recommend:

Lü (Roll Back and Redirect)

Lü (Roll Back through Whole-body Spiral Redirection)

This better reflects the meaning in the Tai Chi Classics and helps students avoid the common misconception that Lü is merely pulling the opponent backward.

13式 An 按

In some traditions, when you press or push, the idea is to keep your arm aligned so that the whole body moves as one unit, minimizing isolated arm strength. In the 13 forms, if the elbow drops first and then rises, it may be a stylistic choice to generate a wave-like power or to use a different kind of energy release. Each approach aims to channel whole-body power, but the slight variations reflect differing interpretations of structure and flow.

Often, when you drop the elbow or sink slightly, it’s about absorbing or neutralizing incoming force—kind of grounding it into your structure. Once that energy is absorbed or redirected, the rising and pressing forward is the issuing part. So, it’s a cycle of yielding first, then issuing energy—just one of the many ways Tai Chi uses both yin and yang in technique.

When you push, the key is to keep the movement connected to your whole body, rather than just relying on local arm movement. This ensures that the power originates from your center and is smoothly delivered outward.

When the whole body is aligned and the momentum is generated from your center—like from your waist or legs—that momentum carries through. It’s that continuous, whole-body motion that allows your hand to keep moving, rather than relying on isolated arm strength. That’s the kind of momentum we aim for in Tai Chi!

The best angle can vary slightly depending on the style, but generally, your upper arm shouldn’t be glued to your side, nor flared out. Often, people aim for roughly a 90-degree angle between the upper arm and torso, and about a 90- to 120-degree angle between the upper arm and forearm. What matters most is that you feel structurally connected, so the force flows from the ground, through the legs, waist, and out the arm without awkward tension.

“Pressing like a wave” (按如浪波) means your push should flow like an ocean wave. The power begins from the ground, passes smoothly through your body, and arrives at your hands in one continuous, natural motion. It’s not abrupt; instead, it swells, adheres, and then issues force smoothly, just like a wave rolling in and then breaking.

13式上掤手 (Upper Ward-off Hand)下掤手 (Lower Ward-off Hand)

The key is to keep your whole body connected. When you do the upper ward hand (shàng pín shǒu), you initiate from your waist and dantian, not just your hands. Keep your shoulders relaxed, your arm slightly rounded, and let the power flow from your legs, through your waist, and out your forearm. In this way, the hand is just a guide, and the whole body stays balanced and coordinated.

下掤手 (Xià Péng Shǒu, Lower Ward-off Hand) is much more than simply holding the hand low. It is an application of Peng Jin (掤勁, Ward-off Energy) directed downward while maintaining the same whole-body connection as 上掤手 (Upper Ward-off Hand).

The purpose of 下掤手

Its main functions are: Support from below (向下托掤) without collapsing. Control the opponent's lower arm (控制下路). Protect your centerline (守中線). Prepare for Lü (捋), Ji (擠), or An (按).

The energy is forward and upward from the ground, even though the hand is lower.

Correct body mechanics (身法)

1. The hand does not lift by itself (不是手抬)

The hand is carried by: Legs (腿), Kua (胯), Waist (腰), Spine (脊柱)

The arm simply transmits the force.

Keyword: Whole-body connection (整體勁)

2. Sink before supporting (先沉後掤)

First: Relax (鬆), Sink (沉), Root (扎根)

Then the Peng energy naturally fills the arm.

Think of a buoy floating upward in water. The buoy does not push upward by itself; the water supports it.

Keywords

Sink (沉), Root (根), Peng energy (掤勁)

3. Keep a rounded structure (圓撐)

Never straighten the elbow.

Maintain a slight curve:

Shoulder relaxed (鬆肩), Elbow sunk (墜肘), Wrist relaxed (鬆腕)

The arm should feel like holding a large ball.

4. The elbow leads the hand (肘領手)

This is often overlooked. The elbow maintains the structure, while the hand follows naturally.

If the hand leads, the shoulder often rises and the structure weakens.

Keywords

Elbow leads (肘領), Hand follows (手隨)

Common mistakes (常見錯誤)

❌ Lifting with the shoulder (聳肩)

❌ Straightening the arm (伸直手臂)

❌ Pushing with the hand (用手推)

❌ Losing Peng structure (失棚)

❌ Separating the arm from the body (手身分離)

A useful analogy

Imagine you are supporting a large beach ball floating on water.

You do not lift it with your arm muscles.

Instead, your body provides the support, and your forearm simply maintains the connection.

The emphasis is on maintaining the original arm-body relationship (原位) and using whole-body power (整體勁) fits well with 下掤手.

A good 下掤手 should not involve actively raising the hand. Rather, the body advances as one unit, and the lower ward-off hand is carried by that movement. The relationship between the forearm (前臂), upper arm (上臂), and torso (身體) changes very little. If the hand appears to move, it is because the body moves, not because the arm works independently.

This is consistent with the Tai Chi principle: > "Its root is in the feet (其根在腳), It is directed by the waist (主宰於腰), Expressed through the fingers (形於手指)."

The hand is the final point of expression, but the force originates from the entire body. This is why a skilled 下掤手 feels both light and remarkably powerful.

The purpose of 下掤手

Its main functions are:

Support from below (向下托掤) without collapsing.

Control the opponent's lower arm (控制下路).

Protect your centerline (守中線).

Prepare for Lü (捋), Ji (擠), or An (按).

The energy is forward and upward from the ground, even though the hand is lower.

Correct body mechanics (身法)

1. The hand does not lift by itself (不是手抬)

The hand is carried by:

Legs (腿), Kua (胯), Waist (腰), Spine (脊柱)

The arm simply transmits the force.

Keyword: Whole-body connection (整體勁)

2. Sink before supporting (先沉後掤)

First: Relax (鬆), Sink (沉), Root (扎根)

Then the Peng energy naturally fills the arm.

Think of a buoy floating upward in water. The buoy does not push upward by itself; the water supports it.

Keywords

Sink (沉), Root (根), Peng energy (掤勁)

3. Keep a rounded structure (圓撐) Never straighten the elbow.

Maintain a slight curve:

Shoulder relaxed (鬆肩)

Elbow sunk (墜肘)

Wrist relaxed (鬆腕)

The arm should feel like holding a large ball.

4. The elbow leads the hand (肘領手)

This is often overlooked. The elbow maintains the structure, while the hand follows naturally. If the hand leads, the shoulder often rises and the structure weakens.

Common mistakes (常見錯誤)

❌ Lifting with the shoulder (聳肩)

❌ Straightening the arm (伸直手臂)

❌ Pushing with the hand (用手推)

❌ Losing Peng structure (失棚)

❌ Separating the arm from the body (手身分離)

A useful analogy

Imagine you are supporting a large beach ball floating on water. You do not lift it with your arm muscles. Instead, your body provides the support, and your forearm simply maintains the connection. From what I know of your Tai Chi approach Based on our previous discussions, your emphasis on maintaining the original arm-body relationship (原位) and using whole-body power (整體勁) fits well with 下掤手.

This is consistent with the Tai Chi principle:> "Its root is in the feet (其根在腳),It is directed by the waist (主宰於腰),

Expressed through the fingers (形於手指)."

The hand is the final point of expression, but the force originates from the entire body. This is why a skilled 下掤手 feels both light and remarkably powerful.

That's an excellent question. If you are referring to Lower Ward-off Hand (下掤手) as it descends from Upper Ward-off Hand (上掤手)—as in the Taiwan 13-Form or Yang-style transitions—then the key is not "lower the hand," but "sink the body while preserving Peng."

1. Do not drop the hand (不是放手)

The biggest mistake is to let the hand fall under gravity. Instead, the whole body sinks (身體下沉), and the arm is carried down by the body's movement. The relationship between the: Forearm (前臂), Upper arm (上臂), Torso (身體) should change very little. The arm should feel as though it is floating on the body, not moving independently.

> "Peng is like water supporting a boat." (掤如水浮舟)

The boat may move down with the wave, but the water continues to support it.

4. The waist controls the descent (腰主下降)

The lowering comes from: Relaxing the Kua (鬆胯), Sinking the center of gravity (重心下沉)

Turning the waist (腰轉) if the form requires it. The hands simply accompany the body's movement.

An advanced feeling: Imagine someone is pressing down on your Upper Ward-off Hand (上掤手). If you resist with your arm, you become stiff. Instead: You relax (鬆), Sink (沉), Keep Peng (棚), Let the whole body absorb the pressure.

As your body sinks, your hand naturally becomes Lower Ward-off Hand (下掤手). The hand did not move first. The body changed level, while the arm maintained its structure.

Based on Tai Chi theory

From our previous discussions, we emphasize:

Original body position (原位)

Whole-body power (整體勁)

No local arm movement (不用局部力)

That interpretation is very consistent with this transition. The upper ward-off becomes lower ward-off because the body sinks, not because the arm is intentionally lowered.

So I would describe the principle as:

> "Maintain the original arm-body relationship (保持原有身臂結構); let the body sink (身沉), the elbow settle (肘沉), and allow the hand to arrive at a lower position naturally (手自然隨身而下)."

This preserves Peng Jin (棚勁) throughout the entire transition.

Body + Faster Rising Arm or Sinking Body Rising Arm

It reflects one of the apparent paradoxes in internal martial arts: the whole body moves as one, yet different parts of the body may appear to move differently. The key is understanding internal force transmission (整體勁) rather than simply copying external movements.

Two Types of Ward-off (掤勁)

1. Rising Body + Faster Rising Arm (身升，手升更快)

This is used when: Lifting the opponent's force upward.

Entering underneath the opponent's arm.

Expanding Peng energy (掤勁).

Theory

The whole body rises from the ground:

Foot → Leg → Kua → Dantian → Spine → Shoulder → Elbow → Hand

The arm reaches its final position slightly earlier because it acts as the tip of the whip (鞭梢).

Although the arm appears to move faster, it is still driven by the legs and waist.

Keywords

Whole-body power — 整體勁

Ground force — 地面反作用力

Kinetic chain — 動力鏈

Whip effect — 鞭梢效應

Peng energy — 掤勁

Expansion — 膨脹

2. Sinking Body while the Arm Wards Up (身沉手起)

This often surprises beginners.

The body sinks while the arm continues to rise.

Examples include:

Brush Knee (摟膝拗步) Ward-off against a taller opponent

Neutralizing upward force

Issuing Peng upward without overextending yourself

Theory

The sinking creates a stronger root.

As the body sinks: the legs compress, the kua folds, elastic energy is stored, and the upward force is transmitted through the relaxed body.

This is similar to compressing a spring. The body goes down. The force goes up. The two directions create greater internal power.

Keywords

Sink the qi — 沉氣

Rooting — 扎根

Compression — 壓縮

Elastic force — 彈性勁

Opposing forces — 對拉勁

Upward Peng — 向上掤勁

Why Are Both Correct?

Taijiquan follows the principle:

"Movement is not judged by appearance but by the direction of force."

External motion (形) and internal force (勁) are not always identical.

Sometimes:

Shape rises, force rises.

Shape sinks, force rises.

Shape turns left, force issues forward.

The body's visible movement is only the carrier; the internal force direction determines the martial function.

Biomechanical Explanation

Modern biomechanics explains this through ground reaction force.

When you rise, you transfer force upward through the body, suitable for lifting or uprooting. When you sink, you increase pressure into the ground. According to Newton's Third Law, the stronger downward force into the floor creates a stronger upward reaction force. If your joints remain relaxed and connected, that force travels through the kinetic chain to the ward-off arm.

Taijiquan Principle

The classics say: > "Its root is in the feet, issued through the legs, directed by the waist, and expressed in the fingers."

「其根在腳，發於腿，主宰於腰，形於手指。」

This does not mean every part rises or sinks together. It means the force originates from the feet and is transmitted as one connected unit.

Another saying is:

> "Above there is intention; below there is support."

「上欲動，下自隨；上欲起，下先沉。」

This explains why many masters slightly sink before or even while raising the ward-off arm. The sinking is not opposite to the upward force—it creates and supports it. This is an example of opening within closing (開中有合) and rising within sinking (沉中有升), where opposite actions coexist to produce a stronger, more connected whole-body Peng energy.

13式 Yin & Yang Palm--Turning the Palm

This is one of the most subtle skills in Taijiquan. If the palm turns over by itself, it is local movement (局部動作). If it turns because of the whole-body Jin (整體勁), then it is Taiji.

The principle

When turning left, do not think about turning the palm (不要想翻掌).

Instead, think about:

The feet root (腳扎根).
The kua rotates (胯轉).
The waist turns (腰轉).
The spine follows (脊柱帶動).
The shoulder remains relaxed (鬆肩).
The elbow leads the forearm (肘領前臂).
Finally, the palm naturally changes from facing down to facing up (掌心自然由下轉上).

The palm is the last part to move, not the first.

The correct feeling (感覺)

Imagine you are holding a large ball (抱球).

As your torso turns left, you are not twisting your wrist. Instead, the entire "ball" rotates with your body.

Because the humerus (上臂) and forearm (前臂) rotate together, the palm naturally changes from:

Palm down (掌心向下)
Palm inward (掌心向內)
Palm up (掌心向上)

This is a gradual spiral (螺旋勁), not a wrist flip.

Where does the rotation come from?

The sequence should be:

Foot (腳) → Leg (腿) → Kua (胯) → Waist (腰) → Spine (脊柱) → Shoulder (肩) → Elbow (肘) → Forearm (前臂) → Palm (掌).

This follows the Tai Chi Classics:

"Its root is in the feet (其根在腳),
It is directed by the waist (主宰於腰),
Expressed through the fingers (形於手指)."

The fingers express what the body has already generated.

Common mistakes

❌ Turning the wrist first (先翻腕)

❌ Twisting the forearm with muscular effort (用前臂肌肉翻掌)

❌ Raising the elbow while turning (翻掌時抬肘)

❌ Separating the hand from the torso (手身分離)

An advanced image

Based on the principles you've shared in our previous discussions, your approach emphasizes maintaining the original arm-body relationship (原位).

Think of the arm as floating in space, connected to the torso. When the torso rotates left, the arm keeps its structure, and the palm changes orientation because the entire connected unit spirals (整體螺旋).

The palm does not actively turn. It is turned by the body's spiral force (螺旋勁).

This is why many masters say:

"The waist turns the hand, not the hand turning the waist."
「腰轉手，不是手轉腰。」

That idea captures the essence of whole-body Jin in palm rotation.

This is where many practitioners begin to use local arm movement (局部用力) instead of whole-body Jin (整體勁).

Suppose you have just completed the turn to the left, and your left palm is facing upward (左掌心向上). Now you want to return to the "Holding the Ball" posture (抱球), where the left palm faces inward toward the ball (左掌心向內).

Do not "turn the palm"

The first principle is: Do not rotate the wrist (不要翻腕).

Instead, let the body bring the palm around.

The sequence

Relax the shoulder (鬆肩).
Sink the elbow (沉肘).
Rotate the waist and kua (腰胯轉動).
Allow the upper arm to rotate naturally (上臂自然旋轉).
The forearm follows (前臂隨之旋轉).
The palm naturally changes from facing up to facing inward (掌心自然由上轉向內).

The rotation begins at the shoulder joint (肩關節) and is transmitted through the arm—not at the wrist.

Think of holding a large beach ball (抱大球)

Imagine there is a large ball between your two hands.

If you rotate only your left hand, the ball would fall.

Instead, the whole frame around the ball rotates together.

The distance between the hands changes very little. The elbows remain rounded (圓肘), the shoulders stay relaxed (鬆肩), and the body turns as one connected unit.

A useful Tai Chi cue

Instead of thinking: "Turn my palm."

Think: "Turn my center (轉中定)."

When your Dantian (丹田) and waist (腰) rotate, the palm simply arrives at its new orientation.

Your own whole-body theory

From our previous discussions, you emphasize that the arm should remain in its original body relationship (原位). Applied here, that means:

The elbow does not wander.
The shoulder does not lift.
The wrist does not actively twist.
The torso rotates, carrying the arm as part of one integrated structure.

The palm changes orientation because the body spirals (身體螺旋), not because the hand performs an isolated action.

That is the difference between using the hand (用手) and using the whole body (整體勁).

13式 Ji 擠

13式 Ji 擠

The Tai Chi Classics do not specify exactly where one hand should touch the other during Ji (擠, Press). Instead, they emphasize whole-body connection (整體勁). Different lineages developed different hand configurations to achieve that connection.

1. Why are there so many hand positions?

There are several common methods:

Method 1. Heel of one palm on the center of the other palm

(掌根對掌心)

This is common in many Yang-style schools.

Advantages

Direct force transmission.
Both wrists remain relaxed.
Easy for beginners to connect both arms into one structure.

Disadvantages

If the palms are pressed together too hard, the shoulders may tense.

Method 2. Fingers touching the heel of the other hand

(指搭掌根)

This is common in some Chen and Taiwan lineages.

Advantages

Less local tension.
Better sensitivity (聽勁).
Easier to maintain Peng Jin (棚勁).

Method 3. Fingers resting near the wrist

(指搭腕)

Often seen in martial applications.

Advantages

Creates a longer structural bridge.
Better for issuing power over a short distance (短勁).

Disadvantages

If the fingers press downward, they can break the wrist alignment.

2. Why do some place the fingers above or below the wrist?

This relates to the line of force (力線).

If the supporting fingers are:

Too high (高於腕)

The force tends to lift the receiving hand.

The shoulders may rise (聳肩).

Too low (低於腕)

The wrist may collapse (塌腕).

The force leaks downward.

Approximately level with the wrist crease

(接近腕橫紋)

This usually provides the straightest transmission of force.

Many experienced teachers naturally arrive at this position.

3. From biomechanics

The press is not generated by the hands.

Think of the force path:

Ground → Feet → Legs → Kua (胯) → Waist (腰) → Spine → Shoulder → Elbow → Forearm → Hands

The joining hand simply connects the two forearms into one structural unit.

The purpose is not to squeeze the hands together.

Instead, imagine both hands resting lightly on the same floating platform.

4. Best forearm angle

Research in martial arts and biomechanics suggests that maximum structural support usually occurs when the elbow is not fully extended.

A useful range is:

Forearm–Upper arm

Approximately 100°–120°

Less than 90° becomes compressed.
More than 140° loses structural support.

Upper arm–Torso

Approximately 20°–40°

The elbows should neither be glued to the ribs nor flared outward.

This allows:

Relaxed shoulders (鬆肩)
Sunk elbows (沉肘)
Whole-body connection (整體勁)

5. Why do good masters look different?

Because the external hand position (外形) is less important than the internal connection (內勁).

If two masters both have:

Rooting (扎根)
Peng Jin (棚勁)
Waist control (腰主宰)
Whole-body power (整體勁)

they may use slightly different hand placements yet produce similar power.

The exact placement is often adjusted for:

Hand size.
Arm length.
Shoulder width.
The specific application (form vs. push hands).

Theory

From our previous discussions, we emphasize:

Original body position (原位).
No local arm movement (不用局部力).
Whole-body Jin (整體勁).

From that perspective, the "best" joining method is the one that does not require either hand to push or pull the other. The contact should be light, serving only to unify the two forearms into a single transmitting structure.

In other words, the hands do not create the force—they merely complete the bridge (搭橋). The actual Ji (擠) comes from the legs, kua, and waist. If changing the hand contact causes the shoulders, elbows, or wrists to tense, then the configuration is no longer optimal, regardless of how traditional it appears. This criterion is more important than copying any single lineage's hand position.

The difference is not simply "one point is stronger" and "a larger area is more sensitive." It depends on how the force is transmitted through the body (整體勁).

1. Palm heel on palm heel (掌根對掌心)

Some masters explain that when the heel of the supporting palm (掌根) presses into the center of the receiving palm (掌心):

The two hands become one rigid structure (一體結構).
The line of force is concentrated.
It is easier to issue Ji Jin (擠勁, Pressing Energy).

This is like focusing force into one structural line, not because the contact area with the opponent is smaller.

The opponent still feels the pressure through your entire pressing surface.

Advantages

Stronger structural support.
Easier for beginners to connect both arms.
Better for direct issuing of force.

2. Fingers on the wrist (指搭腕)

Some Yang and Wu lineage teachers prefer placing the fingers lightly on the wrist because:

The receiving hand remains more independent.
The wrists stay softer.
The practitioner can feel subtle changes more easily.

This may improve:

Listening Energy (聽勁)
Adhering (黏勁)
Following (隨勁)

especially in Push Hands (推手).

So yes, many teachers associate this method with greater sensitivity.

3. Does a smaller contact area produce more power?

From a physics perspective, we need to distinguish two ideas:

Pressure = Force ÷ Area (壓力 = 力 ÷ 面積).
Total Force (總力量).

A smaller contact area creates higher pressure if the total force is the same.

However, it does not automatically increase the total force.

In Tai Chi, what matters most is whether the force from the ground reaches the opponent without "leaking."

4. Does a larger contact area improve listening?

Generally, yes.

A slightly broader and more relaxed connection gives more sensory information through the skin, fascia, and joints.

That is why many Push Hands practitioners prefer a softer wrist connection.

However, if the contact becomes too broad or too loose, the structure may become less efficient for issuing power.

5. A practical compromise

Many high-level practitioners unconsciously do both.

During listening (聽勁), the hands remain light and sensitive.
At the instant of issuing (發勁), the structure naturally becomes more unified.

The hand position may even change slightly during the transition.

My assessment

I think the explanation you've heard is basically correct, but it should be refined:

Palm-to-palm (掌根對掌心) is not stronger simply because it concentrates on one point. It is stronger because it often creates a more direct structural alignment (結構對正) between the two arms and the torso.
Fingers-on-wrist (指搭腕) is not better simply because the contact area is larger. It is often more sensitive because it allows the wrists and forearms to remain more relaxed, improving Listening Energy (聽勁).

In other words:

If your purpose is maximum issuing power (發勁), many teachers favor a more unified hand structure.
If your purpose is maximum sensitivity (聽勁) in Push Hands, many teachers favor a lighter, less restrictive connection.

A skilled practitioner can use either method effectively because the decisive factor is still whole-body integration (整體勁), not the exact placement of the supporting hand.

13式 Cǎi (採)

13式 Cǎi (採)

This is one of the most misunderstood techniques in Tai Chi. The word Cǎi (採) is often translated as pluck, but that translation is incomplete.

In the Tai Chi Classics (太極拳經), Cǎi (採勁) means to seize an opportunity by suddenly taking away the opponent's support or root (採其根、取其勢). It may appear as a downward action, but it is not simply pushing downward.

1. What is Cǎi (採)?

Cǎi combines three actions:

Listen (聽勁) to the incoming force.
Attach (黏勁) without resisting.
Take away the opponent's balance (採勁) by a coordinated downward and slightly backward spiral.

The direction is not straight down.

It is usually:

Downward (下)
Slightly backward (後)
Slightly inward toward your center (向己中線)

Think of plucking a ripe fruit (採果). You don't pull straight down—you slightly rotate and detach it.

2. In the Taiwan 13-Form

You described the movement correctly:

Hold the ball (抱球) with the left hand above (左手上) and right hand below (右手下).

Then turn into Cǎi (採).

The biggest mistake is:

❌ Using the forearm to push downward.

Instead:

Step 1. Sink (沉)

Relax the: Shoulder (鬆肩), Elbow (沉肘) , Kua (鬆胯)

Your center lowers first.

Step 2. Rotate the waist (腰轉)

The waist initiates the movement.

The forearm is carried by the body's rotation.

Step 3. Let the forearm "receive" the opponent

Imagine the opponent's arm is resting on your forearm.

You do not hit it downward.

Instead, your body sinks and rotates, so the forearm naturally carries the opponent's arm downward.

The feeling is like lowering a heavy curtain, not chopping wood.

3. How should one forearm press down?

The forearm should remain rounded (圓).

Do not lock the elbow.

The contact point is usually the ulnar side of the forearm (尺骨側前臂) rather than the wrist.

The pressure comes from:

Feet → Legs → Kua → Waist → Spine → Shoulder → Elbow → Forearm

The forearm is only the final transmitter.

4. Best angles

These are approximate structural ranges rather than fixed rules.

Elbow angle (Forearm–Upper arm)

About 100°–120°

Less than 90°: compressed.
Greater than 130°: structure becomes weak.

Upper arm–Torso

About 20°–35°

The elbow stays close enough to connect to the torso but not glued against the ribs.

Forearm

The forearm should form a gentle curve.

There should always be Peng (棚).

Even during Cǎi, you should never feel the forearm collapsing.

5. Why does it feel like pressing down?

Because your body sinks (身沉).

To the opponent, it feels as if your forearm is pressing down.

Internally, however, you are not pushing with the arm.

You are:

Sinking (沉)
Rotating (轉)
Borrowing gravity (借重力)
Maintaining Peng (棚勁)

The opponent falls because their structure is being led downward, not because you are forcing it down.

6. A classical explanation

Although the Tai Chi Classics do not describe the exact arm angles, they repeatedly stress the governing principles:

"Its root is in the feet (其根在腳), directed by the waist (主宰於腰), and expressed through the fingers (形於手指)."

Applied to Cǎi, this means:

The forearm does not generate the downward force.
The body's sinking and rotation generate the force.
The forearm simply maintains a connected bridge (橋) to transmit it.

Based on your own whole-body theory

Your emphasis on keeping the arm in its original relationship to the torso (原位) fits Cǎi very well. Rather than thinking "press down with the forearm," think:

"Sink my center, rotate my waist, and let my forearm accompany the body while maintaining Peng (身沉、腰轉、前臂隨身而不失棚)."

That produces a true Cǎi Jin (採勁)—a whole-body action that uproots the opponent instead of a local downward press with the arm.

13 式 Liè (挒)

13 式 Liè (挒)

This is another excellent question. Liè (挒) is probably the least understood of the Eight Gates (八法). Many people think it is simply "split apart," but according to Tai Chi theory, Liè is not pulling the hands apart—it is creating two opposing spiral forces (對拉螺旋勁) generated by the whole body.

1. What is Liè (挒)?

Liè is often translated as:

Split (挒)
Separate (分)
Divide (分勁)

But the essential idea is:

Two forces moving in different directions while remaining connected through the body (兩勁相反，整體相連).

The power comes from the waist (腰) and kua (胯), not from the arms.

2. Starting from "Holding the Ball" (抱球)

Suppose:

Right hand up (右手上)
Left hand down (左手下)

When performing Liè:

Right hand (upper hand)

The right forearm spirals:

Slightly downward (微下)
Slightly outward (微外)
Backward toward your center (向後)

It does not lift independently.

Left hand (lower hand)

The left forearm spirals:

Slightly upward (微上)
Slightly outward (微外)
Forward (前)

Again, it is carried by the body.

The two hands create opposite directions, but the torso remains one connected unit.

3. The feeling

Imagine twisting a wet towel (擰毛巾).

One hand seems to go one way, the other another way.

However, the power comes from your trunk, not from your wrists.

This is why Liè is sometimes called spiral energy (螺旋勁).

4. Best angles

There are no fixed angles in the classics, but from biomechanics and traditional structure:

Elbow angle (Forearm–Upper arm)

Approximately 100°–120°

Never completely straight.

Never tightly folded.

Upper arm–Torso

Approximately 20°–40°

The elbows remain connected to the ribs without being squeezed.

Distance between the hands

Neither too close nor too far.

Many teachers use roughly one shoulder width as a reference, adjusting according to body size and application.

5. The most common mistake

Many practitioners perform Liè like this:

❌ Right arm pulls up.

❌ Left arm pulls down.

This uses shoulder and arm muscles (局部力).

True Liè is different.

The body rotates, the kua separate slightly, and the hands are simply carried by the spiral generated from the center.

6. Classical explanation

The Tai Chi Classics describe Liè through principles rather than choreography.

The movement should embody:

One movement, the whole body moves (一動無有不動).
Internal and external unite (內外相合).
The waist governs (腰為主宰).

These principles are more important than the exact path of the hands.

Based on theory

From our many discussions, the concept of "maintaining the original body position (原位)" fits Liè especially well.

Instead of thinking:

"The right hand goes up and the left hand goes down."

Think: "The torso creates two opposite vectors (身體形成兩個相反的力向), while the arms preserve their relationship to the torso."

In other words, the body splits; the arms do not.

That is why high-level Liè looks effortless. The hands appear to separate, but the actual force comes from the rotation of the waist (腰轉), the opening and closing of the kua (胯開合), and the spiral connection through the spine and shoulders (脊柱與肩帶的螺旋連結).

This interpretation is also the most consistent with modern biomechanics: the largest muscles of the legs, hips, and trunk generate the torque, while the arms function mainly as connected transmitters rather than independent sources of force.

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Lü (捋) — Roll Back（捋）

Definition（定義）

Tai Chi Classics（太極拳論）

"Neither resist nor let go."

"Lead into emptiness."

"Four ounces deflect one thousand pounds."

Biomechanics（生物力學）

Mechanical Characteristics（力學特性）

Body Method（身法）

The Ancient Character 𢳋 (Hand Radical + 屢)

Meaning

Difference Between 捋 and 𢳋

Relationship with Peng（掤）

Teaching Explanation（教學說明）

A small terminology suggestion for your WTCCF manual

The principle

The correct feeling (感覺)

Where does the rotation come from?

Common mistakes

An advanced image

Do not "turn the palm"

The sequence

Think of holding a large beach ball (抱大球)

A useful Tai Chi cue

Your own whole-body theory

1. Why are there so many hand positions?

Method 1. Heel of one palm on the center of the other palm

Method 2. Fingers touching the heel of the other hand

Method 3. Fingers resting near the wrist

2. Why do some place the fingers above or below the wrist?

Too high (高於腕)

Too low (低於腕)

Approximately level with the wrist crease

3. From biomechanics

4. Best forearm angle

Forearm–Upper arm

Upper arm–Torso

5. Why do good masters look different?

Theory

1. Palm heel on palm heel (掌根對掌心)

2. Fingers on the wrist (指搭腕)

3. Does a smaller contact area produce more power?

4. Does a larger contact area improve listening?

5. A practical compromise

My assessment

1. What is Cǎi (採)?

2. In the Taiwan 13-Form

Step 1. Sink (沉)

Step 2. Rotate the waist (腰轉)

Step 3. Let the forearm "receive" the opponent

3. How should one forearm press down?

4. Best angles

Elbow angle (Forearm–Upper arm)

Upper arm–Torso

Forearm

5. Why does it feel like pressing down?

6. A classical explanation

Based on your own whole-body theory

1. What is Liè (挒)?

2. Starting from "Holding the Ball" (抱球)

Right hand (upper hand)

Left hand (lower hand)

3. The feeling

4. Best angles

Elbow angle (Forearm–Upper arm)

Upper arm–Torso

Distance between the hands

5. The most common mistake

6. Classical explanation

Based on theory