“Understanding the real and implied geometry of Wing Chun”


These geometric concepts of Wing Chun are presented in relatively fixed positions and shapes congruent with their respective Forms but they need to translate to all Forms



We had a great nights training on Monday, it was very theory-heavy but all the guys were up for it so it was a real eye-opener and very enjoyable as the teacher.

This post is, on the whole, a memory aid for my guys to go back and refresh their thinking because there was way too much information to take in in one evening.

Theory can be dry, and it is always tricky because only people with genuine fighting experience understand that theory and reality are in no way related, so we mixed it up with a lot of live contacts to feel the IDEA.

Of equal importance, we worked hard on creating a language to describe the work that we could all understand.

One of if not the first theory we encounter is “Centreline Theory”.

What is a centreline?

The definition of a Centreline is a line that bisects a plane.

The Wing Chun Centreline bisects the Coronal or Frontal plane of our body dividing us into left and right sides.

An imaginary line connecting ourselves to an opponent is not a centre-line, this is a common misunderstanding that leads people down the wrong path, in theory, our Centreline acts like a plane {Sagitalplane} extending forwards so it is easy to see how this confusion arises.

The use of the term Centre-line for a line from person to person is a misnomer it would be easier to grasp if we called it centre plane.

If this is confusing ask yourself “If a line from myself to my opponent is a centreline, what plane is it the centre of? What and where are the two halves”?

This may seem like a triviality but if we do not understand what a Centreline is how can we understand Centreline Theory?

This line that our perception creates that we think links us to an opponent can be anything we want it to be because it does not exist, I like to think of it as the line of mass, this IDEA can tie into other aspects of our strategy and theory.

Line of Mass is just a name we came up with on the night, if it does not work for you pick a different name, just not Centreline.

The reason I chose Line of mass is that irrespective of what type of movement is being used the opponent’s body mass follows this line, and as for ourselves, this is how we promote our body mass toward an attacker even as we appear to be avoiding an attack or moving away.

Then there is the attack- line, this is a line that runs fro the shoulder or the hip of an attacker in toward us.

An opponents attack aways finishes at a point on this line, even from a wildly swinging punch or kick, redirecting this line, and not the arm/fist/weapon using this line is the purpose of our defensive manoeuvres.

Intercepting the attack line and not the arm/leg is the most effective way to defend.

Chi Sau helps us identify and understand this and it also shows us how to create diagonal movement by the use of circular arm motion and curved arm paths.

The proximal to distal {in to out} direction of our action is always in a straight line even from a curved movement, i.e. Bong Sau travels in a straight line.

Try to not confuse straight with being parallel or perpendicular to an external reference point.

Single Arm Chi Sau essentially moves or redirects an intercepted attack-line up and down on our centre-line.

Double Arm Chi Sau moves or redirects an attack-line from the “inside gate” out to the periphery of our structure or from the outside of our structure into our centre effectively breaking both the attack-line and the line of mass of our attacker.

In a real-world application, we would combine a little of both IDEAs, for example in toward the CL and down or out away from the CL and up.

In a poorly trained person, the attack-line is rarely separated from the line of mass.

As a Wing Chun fighter on the attack, we cannot maximise our output if we do not understand the geometry and how to combine the line of mass with the attack-line while at the same time creating torque through “muscular” rotation.

These geometric concepts of Wing Chun are presented in relatively fixed positions and shapes congruent with their respective Forms but they need to translate to all Forms, all planes and directions of action, this is the heart of the work.

This is one of the principal learning objectives of Chum Ku, understanding how to support the actions {arm shapes} with our body mass as we make contact with an opponent.

Anything that makes contact with an opponent in any way, either defending or attacking creates a bridge and as such is Chum Kiu.


The following video is not the best I have ever done if you are a visitor I apologise, for us INCas it is a fairly accurate representation of what we worked on all week, I will repost it to the BODYWORK page so you can revisit easily.






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