Ok
Two Forces Added Together in Tiger Mouths and Double Hand Push
合勁 (combined / unified issuing) in push hands.
Let’s break it down clearly from structure, biomechanics, and Tai Chi classics.
1. What is 合勁 (He Jin) fundamentally?
In Tai Chi terms, 合勁 is NOT simply “two forces added together.”
It is:
multiple contact points → one unified intent (一意)
multiple structures → one direction of whole-body force (整勁)
external joining → internal merging (內外相合)
So the key is NOT whether the hands are parallel or converging —
the key is whether the body produces ONE center-directed force.
2. Two common methods
(A) Parallel issuing (雙口平行)
Characteristics:
👉 But:
(B) Converging to one point (合點發勁)
Characteristics:
👉 This is closer to what we call 真正的合勁
3. So which one is 合勁?
👉 Strictly speaking:
Because:
合勁 = 多源 → 一點
(multiple sources → one point)
4. Internal mechanics
Even when externally it looks like “two hands”:
Internally it must be:
丹田 (dantian) = one center
力路 (force path) = one pathway
意 (intent) = one direction
If internally you have:
left hand pushing
right hand pushing
👉 That is split force (散勁) — not 合勁
5. Biomechanics explanation
When both structures target the same elbow point:
You create:
Force convergence
Joint locking effect
Loss of opponent’s Peng structure
Whole-body integration
6. Tai Chi classical view
This relates to:
「合則為一」
「勁由內合而出」
「其根在腳，發於腿，主宰於腰，形於手」
Also very close to:
7. Advanced nuance
A high-level practitioner may:
👉 This is the key:
外形可分，內勁必合
(externally separate, internally unified)
8. Practical guidance for the case (elbow attack)
If your goal is:
✔ Control → use parallel structure
✔ Break / issue → use converging 合勁
For elbow specifically:
👉 Think:
“two lines → one center → from one dantian”
9. One sentence summary
合勁 is not two hands hitting together —
it is one whole-body force arriving through multiple contacts into one point.
In fact, double push is one of the clearest expressions of 合勁 (unified issuing).
But the key is how you apply it.
1. Two levels of Double Push (very important distinction)
(1) Beginner level: 雙手推 (two-hand push)
👉 This is:
Result:
feels strong but easy to neutralize
opponent can rotate, absorb, or split your force
(2) Advanced level: 雙按合勁 (true Double Push)
👉 This is:
2. How convergence works in Double Push
In application, you have three options:
(A) Pure parallel push
Both palms forward
Same direction
✔ Stable
❌ Less penetrating
(B) Slight converging (recommended)
✔ This creates:
compression
structural collapse
deeper control
👉 This is practical 合勁
(C) Internal convergence (highest level)
👉 This is:
外平內合
(Externally parallel, internally merged)
3. Biomechanics of Double Push 合勁
When done correctly:
Force path is:
NOT:
Left arm pushes
Right arm pushes
👉 Instead:
The body pushes once,
the hands just deliver it.
4. Why Double Push is ideal for 合勁 training
Because it forces you to resolve:
(1) Coordination problem
(2) Center control
(3) Timing unity
5. Tai Chi classical connection
Double Push relates directly to:
6. Common mistakes (very important)
❌ Using arm strength
→ becomes stiff pushing
❌ Two separate intentions
→ breaks unity
❌ Over-converging
→ shoulders tense, chest collapses
❌ Losing peng (掤)
→ no elasticity → dead force
7. Practical cue
When doing Double Push, think:
“One center → expands → arrives through both hands into one point.”
Or even more precise:
“Not two hands pushing — one body issuing.”
8. One-line conclusion
Double push hands is not about using two hands —
it is about whether two contacts can express one unified force (合勁).
1. Double Push ↔ Wu-Hao「氣之折疊」(Qi Folding)
This is where your question becomes high-level internal work, not just technique.
(1) What is 折疊 (folding) in Wu-Hao terms?
Wu-Hao does not treat force as linear.
Instead:
👉 So:
合勁 = 折疊後的結果
(He Jin is the result of folding, not just combining)
(2) Apply this to Double Push
When you use both hands:
❌ Wrong idea:
👉 This is linear, not folding
✔ Correct Wu-Hao idea:
Inside your body:
one side = rising / expanding (陽)
one side = sinking / storing (陰)
front/back, left/right all fold into dantian
Then:
👉 From the fold → one release through both hands
(3) Internal image
Think:
Not two arrows → target
But:
👉 A sphere compressing → then expanding outward
This is why Wu-Hao says:
(4) So in Double Push
Real process:
Opponent contact → you receive (接)
Internally fold (折疊) into center
Dantian unifies
Release → both hands express one force
👉 This is 內合 → 外發
2. Mapping to your 指定推手對練 judging (A / B scoring)
Now let’s make this practical for judging — very important for your manual.
A組（動作規格品質）— What judges SEE
✔ Good 合勁 indicators:
Both hands:
move simultaneously
arrive together
Structure:
shoulders relaxed (鬆肩)
elbows sunk (沉肘)
Body:
Direction:
👉 Visual impression:
「整而不散」
❌ 散勁 / 錯誤:
👉 Visual impression:
「二勁分出」
B組（演練水平功力）— What judges FEEL / perceive
This is where 合勁 becomes decisive.
✔ High-level 合勁:
Force feels:
deep (沉)
connected (連)
penetrating (透)
Opponent:
Timing:
👉 This reflects:
❌ Low-level force:
👉 This is:
3. Clear judging language you can use
You can standardize like this:
合勁 (He Jin)
Two or more contact points driven by one unified center (dantian),
issuing along a single intent and arriving simultaneously at one effective target.
散勁 (San Jin)
Multiple forces acting independently without internal unification,
resulting in dispersed direction and reduced effectiveness.
4. Key differentiation phrase (very useful for judges)
You may include:
「觀其形似雙手，察其勁為一體」
(Looks like two hands, but the force is one body)
5. Final integration (very important)
Now we unify everything:
Double Push at highest level:
One sentence summary
In Double Push, true power does not come from two hands —
it comes from folding (折疊) into one center and issuing as one unified force (合勁).
Excellent — now let’s systematize it into your manual language so it is usable for:
A1–A30 terminology system
Application across the four sets (黏貼 / 外承接 / 內承接 / 八法)
I will keep it aligned with your existing structure and judging logic.
1. Add 合勁 into your A1–A30 Terminology System
You should treat 合勁 (He Jin) not just as a concept, but as a core evaluation principle embedded across movements.
🔹 Proposed new entry
A31 合勁 (He Jin – Unified Force)
Definition:
The integration of multiple contact points into a single, unified force driven by the dantian, issuing simultaneously along one intent and direction.
Key Characteristics:
🔹 Supporting contrast term
A32 散勁 (San Jin – Dispersed Force)
Definition:
Multiple forces acting independently without internal unification, resulting in split direction, reduced efficiency, and loss of structural integrity.
🔹 Optional refinement (very valuable)
A33 折疊勁 (Zhe Die Jin – Folding Force)
Definition:
The internal folding and overlapping of forces from multiple directions into the dantian, forming the basis for unified issuing (合勁).
👉 This directly links Wu-Hao theory into your system.
2. Embed into existing key actions (important)
You should annotate where 合勁 appears naturally:
Example mappings:
A3 雙按 (Double Push / An)
A2 掤 (Peng)
👉 Without 合勁 → Peng collapses into local force
A6 擠 (Ji)
A13 架 (Frame / Upward intercept)
👉 This is exactly where your 架 vs 上掤 debate becomes meaningful
3. Apply across the Four Sets
Now let’s map clearly — this is crucial for your international standard.
(1) 黏貼法 (Sticking & Adhering Method)
Core quality:
合勁 requirement:
👉 Judging key:
「黏中有合」
(2) 外承接法 (Outer Receiving Method)
Core challenge:
合勁 requirement:
👉 Judging key:
「外分內合」
(Externally separated, internally unified)
(3) 內承接法 (Inner Receiving Method)
Core feature:
closer body connection
easier to unify
合勁 requirement:
Must show:
folding (折疊)
then unified release
👉 Judging key:
「內合而發」
(4) 八法 (Eight Methods)
This is where 合勁 becomes most visible.
Key examples:
採 (Cai)
挒 (Lie)
👉 Critical point:
✔ This is advanced 合勁
肘 / 靠 (Zhou / Kao)
Requires:
easiest place to see:
4. Direct judging language (ready to use)
🔹 For A組 (Form Quality)
Movements involving two or more points of contact must demonstrate unified coordination.
If the limbs act independently or arrive asynchronously, it shall be considered dispersed force (散勁).
🔹 For B組 (Skill Level)
High-level performance demonstrates internal integration (合勁), where force originates from a single center and affects the opponent’s structure as a whole.
Lower-level performance relies on local or separated force, lacking penetration and structural control.
5. One core judging principle (very powerful)
You can summarize everything into one line for judges:
「凡雙點接觸，必觀其是否歸於一勁」
(Whenever there are multiple contact points, examine whether they return to one unified force)
6. Final integration sentence (for your manual)
In all four methods and across all techniques, the essential criterion is not the number of contact points, but whether they are governed by a single integrated force (合勁) arising from internal folding (折疊) and expressed through coordinated whole-body movement.
