盪動

盪動  means a subtle, continuous swinging of the arms carried by successive movements of the body, while maintaining responsive contact with a partner. I would translate it as “body-led swinging motion” rather than simply “moving forward and backward.”

The author is describing how the movement is produced, not merely its direction.

1. The body leads; the arms follow with a slight delay（身軀帶動，手臂稍隨後）

The key sentence is:

「但是都稍遲於身軀動力的起止」

The arm movement begins and finishes slightly later than the body’s driving action. In the author’s model:

• The waist and legs（腰腿） start a shift or turn.
• That movement carries the relaxed arms.
• The arms follow through a little after the body’s initial action.
• Successive body movements sustain a small, continuous swinging quality.

Think of gently moving the support of a hanging pendulum: movement of the support sets the pendulum moving. The human arm, however, remains actively coordinated; it is not a completely passive pendulum.

2. The hand can travel farther than the torso（手行較長）

The author says:

「速度比身軀動作稍快，距離比身軀移動稍長，實在是一種擺動作用」

He means the hand is not held rigidly in one position relative to the torso. It has an additional swinging movement, so its path can extend beyond the movement of the body carrying it.

For example, a small turn of your torso can carry your shoulder, while movement at the shoulder and elbow lets your hand travel through a larger arc.

This is a possible movement pattern, not a universal rule: the hand does not necessarily move faster or farther in every Tai Chi movement.

3. 盪動 is a series of connected carrying actions（連續帶動）

The author distinguishes:

Term	Meaning in these pages
帶動	One movement of the torso carries the arm.
盪動	Successive torso movements keep carrying the arm, producing a subtle swinging or wave-like continuity.
趁勢前進	The preceding section describes continuing onward with the momentum already obtained, under conscious guidance.
隨勢前進	In 盪動, the arm follows the ongoing carrying action, without adding a separate surge of acceleration or an extended coast.

His phrase 「略有不顯著的波動意味」 is important: the wave-like quality is slight and unobtrusive. He is not asking you to shake the arms or make a large visible body wave.

4. It includes several directions—not just forward and backward

The next page explicitly lists:

Form of 盪動	Author’s description
橫盪	Swinging or circling in a horizontal plane.
縱盪	Swinging or circling in a vertical plane.
斜盪	Swinging or circling in a diagonal plane.
來復盪	Moving horizontally forward and backward.

So “Moving Forward and Backward” is too narrow as a translation of the whole category; it describes only 來復盪.

5. What does 上動下應 mean?

He writes:

「手心和腳心相應，肘端和膝端相應，胸中和腹中

 

相應」

He wants the upper and lower body to remain coordinated: palms and soles, elbows and knees, chest and abdomen correspond（上下相應）.

Crucially, the following page also says:

「動作以腰腿為主宰」

Therefore, 上動下應 does not mean the arms independently initiate everything and pull the legs along. Read together, these statements describe an integrated relationship: the waist and legs organize the movement, and upper-body adjustments remain matched by lower-body support and adjustment.

Nor does “correspond” necessarily mean that the elbow must stay directly above the knee throughout every movement.

6. The purpose is responsive contact（不丟不頂）

The author calls 盪動:

「練習不丟不頂的中定手法」

That is the practical purpose. The slight freedom of the arms allows you to follow a partner without:

• 頂: stiffening and forcing directly against the contact;
• 丟: losing the contact or connection;
• losing 中定: your coordinated balance and organization.

His reference to 四兩 is a traditional image of light, sensitive contact—not a literal requirement to maintain one exact force.

In your push-hands practice, imagine this: your partner moves the contact point; your waist and legs adjust, your shoulder and elbow remain available, and your hand follows in a small continuous arc. The arm is neither fixed to the torso nor swinging away independently.

The author’s central idea is: “Let the body carry the arms, let the arms remain responsive, and keep the whole movement connected.”

身帶手行，手能隨應，周身連貫。

In this text, 盪動 (swinging/undulating motion) refers to a specialized internal follow-up method (跟蹤手法) where the arms or limbs are carried along by the continuous shifting of the torso’s core power (身軀移轉動力).

The author distinguishes them by what carries the arms and how the movement continues:

• 帶動: the body sets the arm in motion.
• 趁勢前進: the arm continues the movement already developed.
• 盪動: successive body movements carry the arm in a continuous, slightly delayed swinging pattern.

These new pages also clarify something in my earlier explanation: 趁勢前進 includes acceleration as well as coasting. It is broader than simply moving on residual momentum.

	帶動 — Body-driven motion	趁勢前進 — Continuing with the momentum	盪動 — Body-led swinging motion
Main question	What starts and carries the arm?	How does the arm continue after being carried?	How do repeated carrying actions connect?
Author’s emphasis	The torso moves the upper limb.	The hand does not stop when the initial driving action ends; it continues, or is accelerated further.	Successive body movements sustain a subtle swinging motion.
Timing	No specific delay is required in this section.	The arm’s movement can extend beyond the initial body action.	The arm begins and ends slightly later than the body’s driving action.
Training purpose	提勁、黏勁 — lifting and adhering skills.	連勁、發勁 — connecting and issuing skills.	中定、不丟不頂 — centred coordination without losing contact or opposing rigidly.

1. 帶動: “My body carries my arm.”

The author defines it directly:

「這是上肢被身軀帶動力所發生的運動作用。」

He lists three sources of body movement:

• 移動: shifting forward, backward, or sideways.
• 轉動: turning around the body’s central axis or waist.
• 起落: lowering and rising.

These can combine. For example, a small turn and weight shift carry the shoulder, which carries the relaxed arm.

Importantly, he says the arm’s speed and direction need not match the torso’s. Thus 帶動 does not mean keeping the arm rigidly fixed to the chest. The shoulder and elbow must remain released: 「必須鬆弛肩肘關節，才可發揮效用。」

2. 趁勢前進: “Once carried, my hand continues.”

His key distinction is:

「如果不在帶動力消失的同時停止動作，便可利用慣性作用繼續前進。」

Here 前進 means continuing along the movement’s course; he explicitly includes both circular movement（圓轉）and linear movement（平進）.

He identifies three versions:

Version	What he means
餘勢前進	The hand continues but gradually slows down.
加速前進	The body continues carrying the hand and its speed increases. He separately calls additional acceleration from arm effort 二重加速.
慣性前進	The body stops its shifting or turning, while the hand continues in its previous direction.

So this category emphasizes continuation beyond, or further development of, the initial carrying action.

3. 盪動: “Repeated body movements keep my arms swinging.”

The earlier page gives the clearest comparison:

「前面的帶動是指身軀一個移轉動力的作用，這種由多個移轉動力連續的作用……所以叫做盪動。」

帶動 focuses on one carrying action. 盪動 focuses on a connected series.

The arms follow with a slight delay, creating 「略有不顯著的波動意味」—a barely noticeable wave-like quality. But the author also specifies:

「被帶動後沒有餘勢延長，也不加速進行，故與趁勢前進有別。」

I read this as: do not deliberately add an extra coast or accelerating extension; let each arm movement belong to the ongoing rhythm of body movement. The small follow-through he describes is part of that swinging cycle.

To feel the difference, imagine one gentle waist turn:

• 帶動: notice how the turn carries your arm.
• 趁勢前進: notice the hand continuing after the initial turn has finished.
• 盪動: connect several small turns or shifts, letting the arms follow each one smoothly, without independently throwing them farther.

The distinction is therefore mainly one of training emphasis, not three entirely separate physical mechanisms. All three involve body–arm coordination. The author separates the carrying action（帶動）, its extended continuation（趁勢）, and its repeated rhythmic connection（盪動）.

What 盪動 Implies and What It Actually Means

• The Mechanical Implication: Rather than pushing or pulling with local arm muscular effort, the limbs float or "drift" along with the body's momentum (隨勢而進). Because multiple core shifts chain together consecutively, the arms experience a subtle, continuous wave-like oscillation (波動意味).
  
  
• Timing and Distance Mechanics: Its movement starts slightly after the torso initiates and stops slightly before or during the next shift. Because of this lag-and-catch-up dynamic, the limbs travel a slightly greater distance at a slightly faster snap than the core movement itself, operating essentially as a pendulum-like swing (擺動作用).
  
  
• The Internal Coordinated Framework: As stated, 盪動 is fundamentally an "upper movement with lower response" (上動下應) methodology, bridging the extremities through six-coordinate correspondences (三合):
  
  
  • 手心和腳心相應 (Palms correspond with soles)
    
    
  • 肘端和膝端相應 (Elbows correspond with knees)
    
    
  • 胸中和腹中相應 (Chest corresponds with abdomen)
    
    

The Reality (The Fact) in Internal Martial Mechanics

From a biomechanical and internal arts perspective, what the author describes as 盪動 maps directly to whole-body kinetic linkage driven by Dantian rotation (丹田內轉) and waist transmission (腰脊為先).

1. Inertial Transfer vs. Local Muscle: When the torso rotates or shifts weight efficiently, it acts as the engine, while the arms act as flexible whips or pendulums. The slight lag described is actually the optimal delayed transmission of torque from the core out to the fingers, preventing stiffness (僵勁).
   
   
2. The Distinction from Forced Movement: True 盪動 avoids two extremes: forcing the arm out independently (which breaks whole-body connection) or remaining dead weight. It relies on 鬆 (relaxation) to allow the internal pressure and structural momentum to carry the limbs seamlessly.
   
   

Classical Tai Chi Citations and Theories

This mechanical principle is deeply rooted in classical Tai Chi literature and theory:

• 《太極拳論》 (The Tai Chi Chuan Treatise):
  
  

  「主宰於腰」「其根在腳，發於腿，主宰於腰，形於手指。」

  ("The master control is in the waist." / "The root is in the foot, issued from the leg, controlled by the waist, and expressed in the fingers.")

  
  

  • Application: This explains why the movement originates in the core shift and manifests as a wave traveling outward to the hands and feet, perfectly mirroring the 上動下應 and palm-to-sole correspondence.
    
    
• 《十三字行功歌》 (The Song of the Thirteen-Word Practice):
  
  

  「氣猶車輪，腰猶車軸。」

  ("Qi is like a carriage wheel, the waist is like the axle.")

  
  

  • Application: The 盪動 wave-like action is the literal expression of the axle turning so that the outer wheel (the limbs) swings smoothly without internal friction or resistance.
    
    
• Internal Body Coordinated Theory (內家六合):
  
  

  「內合其氣，外合其形。」

  ("Internally harmonize the breath/qi, externally harmonize the physical form.")

  
  

  • Application: The internal correspondences mentioned in the text—such as elbows matching knees (肘膝相應)—are classic manifestations of 外三合 (external harmonies) operating dynamically under continuous momentum rather than static positioning.