Thursday, March 5, 2015

Wing Tchun Do 4 Power Principles


1) Free yourself from your own power
2) Free yourself from your enemy’s power
3) Learn to use the power of your enemy
4) Add Your Own Force

The first principle; Free yourself from your own power A WingTchunDo fighter, needs to free himself from his own power. His strength, attitude, ego and emotions will detour a WTD fighter from his true power. Strength; there are two types of strength, muscular strength and endurance strength. Muscular strength is the amount of force a muscle can produce with a single maximum effort. Endurance strength is the ability to hold or repeat a muscular contraction for a long time. Both need to be free of tension to achieve maximum effort. It’s important to accept that you are not the strongest and there will be times where your enemy is the stronger. Wasting energy by trying to overpower a stronger enemy is foolish.  Attitude; attitude makes an enormous difference to how you perceive combat. Attitude is a powerful thing and you can leave a lasting impression on your enemy for good or for bad. So it’s incredibly valuable to know how to project a positive attitude and be aware of what subtle messages your attitude conveys to your enemy. Ego; ego is the most difficult,  there are two types of ego. Ego orientation: Fighting because you want to be the winner.Task orientation: Fighting because you enjoy being the best by improving your own personal best performances. You can have both kinds of motivation  but it's best to be high in both ego and task orientation or low in ego and high in task orientation. People with these types of motivation work hard at winning and do not give up when things are not working out. People who are high in ego orientation and low in task orientation do not always succeed and may give up when they are no longer winning. The wrong ego type will cause mass amount of tension in the body. If you have a ‘fight with yourself’ you’re trying to justify yourself to your ego and convince it you aren’t this person. If you don’t have these fears, you don’t have doubts and you really are capable. Your ego loves this because it will trick you into thinking that you can win the fight, but as the fight begins the tension in the body steals your power. Emotions, success as a fighter is often incorrectly associated with vigor and anger. Emotionally enlighten Wing Tchun Do fighters can get themselves into the appropriate emotional states for the demands of the situation. If the situation requires high arousal, emotionally enlighten people are good at getting themselves psyched up and prepared. Equally, if the situation requires calmness, emotionally enlighten WingTchunDo fighters are good at relaxing themselves. WingTchunDo fighters that perform in the zone effectively regulate their emotions. I think what I am saying here is that we need to free one’s self from one’s self. In realizing your are not the strongest, attitude affects you as well as your enemy and our ‘dark side’ is ego, our ‘light side’ is true self and emotion must be trained to regulate itself. Only then can a WTD fighter truly be free from his own power. If you truly want to change your life, you must first change your mind. This will free yourself from the restrictive thinking that holds you back.
The second principle; Free yourself from your enemy’s power
A WingTchunDo fighter, knows that when an enemy wants to use strength to overpower, the response is not to try to overcome strength with strength but to nullify or disperse his energy.  Don't counterattack but control his movements. Most fighters do the mistake of responding back to threats without thinking, acting on emotions and as a result they find themselves stuck in a corner with few options. Instead of doing so you must be the one who forces your enemy to do the things that you want him to do. For example if you knew that your enemy was present then instead of waiting until he attacks you, you should surprise him by taking the first move and doing so forces the enemy to be in the defensive side. Don't get me wrong I am not saying to attack him because you fear him or the outcome but just approaching him with confidence and showing him that you know who the enemy is. That this circumstance does not rattle you. This alone may be enough to force him to hesitate. Sometimes creating a perception of power in the eyes of your enemy, like acting as if you know the outcome can be enough to cause him to hesitate. This moment of hesitation, stealing your enemy’s power from him by directly confronting his power physically and mentally. Dispersing what ever power confronts you with relaxation and not tension is the key to freeing yourself from your enemy.You are not in competition with anybody except yourself; plan to out do your past not the enemy.
The third principle; Learn to use the power of your enemy
A WingTchunDo fighter knows there are numerous methods for acquiring power.The more powerful you become the less room you give your enemy to work against you ( like jamming your enemy’s arm, leg and or body). With this in mind take advantage of the force your enemy gives you by recycling his energy back at him. If the enemy pulls you toward him, use that energy as part of your attack. Or if an enemy attacks you to the right side of your body, you can use the spiral energy of your spine to act as a revolving door thus using your enemy’s power to attack with your left arm and so forth. I believe if you have two good options, always go with the one that scares you the most, because that’s the one that’s going to help you grow as a WTD fighter. Don’t worry about what you can’t control and you may liberate yourself for your enemy. People of average ability often achieve outstanding success because they don’t know when to quit. WTD fighters succeed simply because they use the power of his enemy
The fourth principle; Add Your Own Force
A WingTchunDo fighter, in addition to borrowing power from his attacker, can add additional force in an attack when the hand, foot or body is free. When a spring loaded door is open it has stored elastic energy. The same can be found in arrow stepping (where the body creates a arch) or spiral elastic energy (where each end of the spine turn opposite of each other) In reality you can say that both of these motion create stored elastic energy.
In Greek mythology, Antaeus was the son of Poseidon and Gaia. He would challenge all passers-by to wrestling matches, kill them, and collect their skulls. He received his super-strength from his contact with the earth. He challenged Heracles and was beating him when Heracles discovered that Antaeus weakened when he was lifted off the ground; holding Antaeus in the air, Heracles crushed him in a bear-hug. In this fashion Heracles learn to use Antaeus  power (the ground) to defeat him. Its important to realize that a feared enemy must be crushed completely. (sometimes they have learned this the hard way.)  If one ember is left alight, no matter how dimly it smolders, a fire will eventually break out.  More is lost through stopping halfway than through total annihilation. For the enemy will recover, and will seek revenge, crush him, not only in body but in spirit.

Sifu Hill WTD

Tuesday, February 24, 2015

CHI SAO

Chi Sao

Chi Sao is used for the development of automatic reflexes upon contact, as well as sticking to what comes and the idea of spring loaded energy. In WingTchunDo, the process starts out with very simple and non-technical exercises that develop this sense of ‘springiness” in your arms. This is practiced by two partners maintaining contact with each other's forearms while executing techniques and training each other to sense changes in body mechanics, pressure and momentum of your partner. The increased sensitivity gained from the Chi Sao drills helps a WingTchunDo fighter to develops spring like attacks and counter attacks to the enemy's movements quickly and with the appropriate techniques that always forcing the action back to the centerline. In practice, you train your arms to become like a loaded spring door, that freely either thrust forward when there is no obstruction, or stick and bend to oncoming arm attacks until their force is dissipated or diverted. If it is dissipated and the arms begins to withdraw, your arm sticks to it and follows it back toward your partner’s centerline. If it is diverted and your arm is suddenly freed, it releases the spring energy it received from the attack and fires it back at your partner. If our partner launches a surprise attack from one of our sides, our nervous system will function in such a way, that it provides a reflex action to deal with the attack without thought. This is an automatic reaction, which can dismissed any disguised movements of attack. If one waits for your brain before do something, it will be too late to take any action. So train our nervous system to give off a reflex action to defend yourself, instead of waiting for the brain to tell you what to do. I see this all the time with novice students, waiting for the brain to tell them what to do but by the time the brain has an answer your partner has moved on to the next move and so on. The reflex action is in fact a subconscious reaction of the body, arising as a result of a sudden and unexpected external stimulus. They are not planned beforehand, and are not made as a result of conscious thought. The purpose of training in Chi Sao, is to develop a reaction that is much faster than that of your partners, apply spring loaded energy into your WingTchunDo techniques, so that you can react unconsciously and without thought, to the attacking movements of your partner.
Chi Sao additionally refers to the methods of Poon Sao or rolling hands drills. Poon Sao participants push and "roll" their forearms against each other in a single circle while trying to remain in relaxed form. The aim is to feel force, test resistance, and find defensive gaps. Chi Sao drills begin with one-armed sets called Dan Chi Sao which help the novice student to get the feel of the exercise; each practitioner uses one hand from the same side as they face each other. Chi Sao is a sensitivity drill to train and obtain specific responses and should not be confused with actual sparring or fighting though it can be practiced or expressed in a combat.It is for this reason that the Chi Sao training constitutes a kind of attack and defense system, which will help to train the nervous system to automatically produce the correct reaction to protect us from your partner’s attack. Its important to realize the difference between individuals, that the reflexes of some people may be faster than those of others. In fact, some people may have very sensitive reactions, whilst others have extremely slow ones.
In Chi Sao practice, both training partners learn different ways and angles and directions of attack and defense in order to let their own “wedge” dominate that of the partners. Chi Sao is just an exercise to train and refine this skill. It is not a “fight” by any means, and it should never be confused with a fight. The entire purpose of it is to make your body so familiar with all of the different situations in which two combatant’s arms can encounter each other that your reaction to what your opponent does becomes faster than your partners. At the same time you learn to make sure that your triangular structure at all times defeats that of your partners. All of this happens in progressive stages of complexity, with offensive and defensive footwork, at first slowly, and then ever faster and more and more supple and flexible until even the slightest change in direction or energy of your partner’s attack is detected by your nervous system, correctly interpreted by the subconscious parts of your brain, avoided or neutralized, and returned to your attacker once the way is freed. All of this happens, virtually by itself, in a fractions of a second. The end result is that you develop the ability to easily and quickly neutralize even the heaviest and fastest attacks. Remember that distance equals time so the simpler the techniques are the more they are likely to actually be applied and the 4 combat and 4 power principles are maintained while practicing your CHI SAO!
Sifu Hill
WingTchunDo 4 Combat Principles
1) If The Way Is Free Move Forward!
2) When Contact Is Made Stick To It!
3) To Give Way To Superior Strength!
4) When Freed To Move Forward Add Your Own Power!

     The First Combat Principle:  If The Way Is Free Move Forward!
A WingTchunDo fighter should always feel the need to move forward, to move directly towards his enemy across the shortest distance. This applies to the arms and the legs as well as to the entire body. A WingTchunDo fighter should always direct his energy towards intercepting or removal of an obstacle in closing the distance. This must be done in a totally relaxed body, legs and arm. One of the many gifts of being relaxed (in the first combat principles) is increased speed. If no obstacle is blocking the direct path of the WTD fighter, he will attack the enemy's with his hand or foot across the shortest distance.You must close the distance quickly without first drawing back the hand or leg or move to one side or side stepping ( the moving to one side or side stepping is a direct cause from your enemy’s superior strength, third combat principle). In Wing Tchun Do the first action of combat to most all combat situations is closing the distance with forward pressure with foot (arrow stepping or kick), hand (contact to the target, intercepting or removal of the enemy’s arm) and closing the distance with the body without hesitation.
    
The Second Combat Principle: When Contact Is Made Stick To It!
A WingTchunDo fighter after applying the first combat principal may make contact with the arm of the enemy. At this point we must maintain our forward pressure towards the vertical center line of your enemy and do not withdraw our arm. Both contact and pressure are maintained, anything less to this approach is fundamentally wrong. You will find that proper applying of combat principle One and Two eliminates or minimizes  the room ( distance ) needed for the enemy to counter attack. When your attack encounters resistance, do not withdraw but stick to your opponent! One could say that the first and second principle is alive, the first with forward pressure and contact,  the second principle the glue that maintains contact, never detaching, freely flowing towards the centerline of the enemy.
    
 The Third Combat Principle: To Give Way To Superior Strength!
A WingTchunDo Fighter after applying the first and second combat principles may encounter a stronger enemy. In this encounter the WTD fighter must maintain the first and second combat principles and deal with the stronger enemy by using your enemy force to move you to one side or moves you to sidestepping. This deformation relaxed reactions which are initiated by pressure acting on our arms, leg or body needs to activate your WTD. As soon as contact is made with the enemy at any point, and exerts Superior Strength at the point of attack, the direction of the attacking force will immediately cause your arm to deform itself or react reflexively without any conscious, (input from the brain). Combining the first three combat principles to the enemy’s attack forms your arms and footwork in such a way as to give you protection. Remember to keep forward pressure towards the new vertical center line of your enemy and not detaching from him. An example would be as simple as your punch being transformed into a Bong Sao, a Bong Sao transformed into a Tan Sao and the Tan Sau into a Reverse Palm Strike. Which can be found in the Siu Nim Tao form.
     


Fourth Combat Principle: When Freed To Move Forward Add Your Own Power!
A WingTchunDo Fighter after making contact with the enemy needs to maintain structure. If structure is lost then one is unable to add one’s own force or power. So the first three principles must be fundamentally active and alive, freely flowing. A good example would be a side stepping Tan Sao with a powerful blow being delivered with the free hand. This all started with principle one, moving forward, principle two sticking to and principle three deformation relaxed reaction (before the hand turned into a tan sao it was moving forward to strike or intercept). Power comes from the ground not body mechanics.  If you are in the space shuttle your body mechanics will create little power. Power is a direct cause of the stability (the sides of the shuttle)  in which the body is grounded to at the moment of kinetic motion. Motion infers a continuous change (displacement) of position, a constant desire to move forward.
In closing I would like to state that a WTD fighter should never hold back, completing what has been started, being first and destroying the enemy’s structure with no hesitation. The keys to combat is the the four principles working actively alive and free flowing. Fighting is Chaos so the key to victory is a controlled chaos. Look to the willow tree in a wind storm and its ability to give way but not completely. When the winds energy decreases the branches return with its own energy back to its center. The true structure is the trunk and roots that keep it grounded.


Sifu Hill WTD



Monday, February 23, 2015

Wing Chun Song

The techniques of Wing Chun Kuen are unique,
The methods are impenetrable and unfastening should be avoided.
Teach and practice with you but training heart is necessary,
Relax and smiling in defeating the opponent to make great tales.
Seeking by the forwarding (Tan) to judge the foe's situation,
It is like watching flowers when afar but strike when he is near.
Let him fly like dragon and hop like tiger,
while I am at ease and entertained.
The hand strikes like the falling star,
The kick is without form like flying arrow.
Upper is in the centerline and lower is gripping the groin,
to ensure the body is inaccessible.
The key is sticking to the bridge of the enemy,
Exalted awareness controls the advance;
The skill is to borrow forces and strike forces,
Four ounces to deflect a thousand pounds.
To strike first has its reasons,
but to encounter embedded the mystery.
Do not stop at a single strike,
forcing the opponent continuously is a must.
Theory:
Go on top of the in coming bridge,
Neutralize the incoming elbow with an elbow.
Close in to long range strikes,
Move the stance forward to incoming stance.
Keeping the incoming hand and send forward the outgoing hand,
Loose hand must follow with forward thrust.
Take the incoming straight thrust with a curve,
Encounter cross hand with straight thrust forward.
Forwarding, obstructing, blocking and twisting,
Topping, stopping, sinking and thrusting.
Sticking, touching, ironing and swinging,
Swallowing and spitting contained stealing and slipping.
Each point in the theory is very clear,
Each technique must be demarcated.
The difference of a line is like heaven and earth,
Slightest bit of slackness will be disqualified!
Committed all these in memory,
One day will retrieve the mystery within.
Honor your teacher and respect your career year after year,
Honesty and determination will generate greatness.
Song:
Clever methods will generate more clever methods,
Unusual training exercises will generate more unusual training exercises.
Wind and thunder generated within an inch,
How can you not be humbled?
True words of the Originator:
The true skill of Wing Chun is difficult to find,
Especially when there are so many branches and levels.
Intelligent plus diligent after many years,
Will still be a lonesome boat in a big ocean.
If confronted with the dishonest sort,
Will not give away for a thousand ounces of gold.

Friday, June 8, 2012


The Experience of a life time, Time with the Grand Master
A truly amazing experience it was to have been visited by Grand Master Fernandez.  Phenomenal demonstrations and applications display his great knowledge in and of the system.  Straight forward and direct with a smooth sense of feeling which throws you off to where you are not expecting the strikes that follow, with more pressure  then  I have never felt before in Chi Sao.  The pressure is there but then again it isn’t. It was like Chi Sao’ing with Sifu Hill on Steroids.  Never failing to follow when I released my pressure, but it felt as though it is maintained and charged from the use of my energy and then BAM it shoots to strike at every opening; before I even knew it, I had been Biu Jee’d, Fak Sao’d, Gaun Sao struck chopped to the neck, arrow punched, hooked, uppercut, pushed, pulled, you name it.  I figured I’d flinch but my eyes were so wide open with a huge smile on my face like a child in a candy store ready to embrace the damage it would cause to my teeth.  
I had often watched the Leung Ting lineage on YouTube many times before and found myself practicing some of the techniques in hopes of obtaining and furthering knowledge and skill in Wing Chun.  There is absolutely nothing better than to feel it firsthand.  To be corrected firsthand is what I humbly embrace so that I know for sure that what I am to apply is applied correctly and the science that enforces it is mind boggling and completely amazes me at how simple angles and wedges can open so much with minimal energy.  Grand Master Fernandez explained it in such a fashion where it was easily understood and absorbed.  We ran drills so we could apply them properly and with correct feel.  My opinion was that for the lack of a better word, all I have is “Awesome”.  I wish there was a better word to describe this one week with Grand Master Fernandez.  It was beyond anything I had expected.
Lop Sau felt like a whole different technique now with redirecting through the use of a stronger muscle other than just the arms.  Also cutting the opponent’s arm away and at the very end is the actual lop itself.  Some of the other lessons were on weight distribution, shifting, and numerous things to mention that I am still absorbing and still drawing from.  Arrow stepping was jaw dropping in the Grand Master’s explanation as he demonstrates and proved how and why it works.  Charging the Spine for more power in strikes while keeping your eyes on the prize so to speak, effective applications in combining all techniques into one motion and stepping right through the opponent brings so much to mind and again I am stuck with that huge smile on my face and wide eyed like a kid in the candy store like it was all the candy you can eat for free.  I no longer feel confined in the structural movement but was freed and advised to move freely with the knowledge of the structure that can be applied to overcome the obstacles that present themselves, from my own observation, applying the structure into natural movement and natural movement into structural movement so to speak.  My first training in the Lat Sao made so much sense in understanding the energy dispersed with proper mechanics as one arm takes out the defense without dissipating the energy for the other arm as it comes in for the strike.  All that with the footwork that swings the weight around and incorporates body weight into the technique while again cutting down the defense as if your arm was a sword slicing the limb away to clear the lane for the strike and then BANG!  Here comes the rain that follows from the initial strike dictated by the obstacles that closes one door and opens another door and yet it is your preference and freedom of choice to apply techniques to keep a door open by closing another.  Fluidity, control, discipline, mind, body, spirit, arms, legs, motion, weight, angle, soft, hard, hips, chest, timing, feeling, pressure, release, breathing, cutting, cupping, grabbing, torque, shift, balance, spine, center, distance, response, reaction, redirect, energy, economy of motion, leverage, wedging, and many other items to factor into the harmony to bring out the essence of what Wing Tchun Do has to offer which was so richly displayed and demonstrated by Grand Master Fernandez.
I had watched the Grand Master on YouTube many times long before I even had the opportunity to meet him.  Through YouTube I’ve always known the Grand Master as his YouTube name “fightermanizdebest”.  Back then I never thought that this recent meeting would ever take place.  I remember Sifu Hill had been training under  Grand Master Fernandez through Skype for quite some time.   All Sifu Hill kept speaking about was Grand Master Fernandez (Fighterman), a Grand Master that actually been training and discussing Wing Tchun Do  to Sifu Hill although on video chat but was still face to face. When Grand Master Fernandez spoke to me and referred to me by name when Sifu Hill had introduced us through Skype, I was proud but humble at the same time with this one question in my mind, “who am I, for a Grand Master of this system would even speak to or even referred to by first name?”   We started getting deeper into the study of Wing Tchun Do  lessons, while in the process of preparing myself for an MMA Cage match I was watching and studying the lesson modules that the Grand Master had provided on a Saturday and I was thinking to myself that it would be great to have Grand Master Fernandez here in the U.S and a few minutes later Sifu Hill texts me a message saying that Grand Master Fernandez will be here on the week of my fight.  Wow, what an honor.  It is what it is and as the Grand Master would say from time to time in his own words and accent “No bullshit mate”.  That is what I can proudly say we got 100% of “No bullshit Mate!”  Grand Master Fernandez uses his Wing Tchun Do and like my Sifu (Sifu Hill) has the scars to prove the use of his Wing Chun, and with that alone signifies effectiveness to me at which I choose to place my trust in.  I trust in the experience my Masters have in that they have applied what they teach in actual combat.  No bullshit mate!  
I bow in humility and proud to be a student representing Wing Tchun Do in the USA.  As time narrowed down to Grand Master Fernandez’s last days here in the U.S he had said something like “I am getting used to this hugging stuff”, I apologize but I am the one to blame for the hugging stuff.  Ever since my Wing Tchun Do school became family to me, I started to embrace it as such.  Family is there when you need them the most and when family needs you the most; you will be there no matter what.  Grand Master Fernandez came to expand his Wing Tchun Do and treated us like students in need of guidance.  Discipline hurts but effective for guidance.  Anyone who can hurt me for my own good is considered family to me.  Over the weekend I had a discussion with my friend Mike Madison where he had jokingly said to me, “let’s throw on some gloves and fight in the cage” since my match ups for the MMA fight had backed out.  He was willing to become my opponent since I had been training too long and hard to end up with no opponent and he saw that I was disappointed, that is brotherhhood, family. Sifu Hill introduced  the ground game to me by placing me under Master Larson of Pinnacle Martial Arts, and my family grew.  Master Larson, Bobby, Phil (Iron sharpens iron), Danny, Dillon, Tony, Matt, Derek, and many others that were there to assist in administering the pain that molds.  I can still remember Sifu Hill’s voice in the background cheering on my sparring partner Danny saying “make him pay”, to make me pay here so that I won’t in the actual fight.  I would collapse out of breath and fatigued, Danny would be there picking me back up to push through to the end of the round encouraging me while punching at the same time.  And then they turn around and say “it’s good for you”.  For a certain period of time I would feel abnormal if I wasn’t feeling any pain.  Anyone who can make me feel that much pain and I accept it as it being good for me is considered family to me.  Sifu Hill was there every step of the way and made sure that I was feeling all this pain because it was good for me.  Discipline is painful but effective for learning.  Proverbs 12:1 To learn; you must love discipline.  Hence the hugging to show love and appreciation for hurting me because it helps me and as Grand Master Fernandez says “No bullshit Mate!”  As he palm strikes me several times across the room.
The Experiences that I have experienced here were made possible by my Wing Tchun Do family.  Thank you my Sifu – Sifu Jody Hill most of all for making it all possible by opening the doors to his school and sharing his knowledge and skill so freely.  We come a long way but we still have quite a journey ahead of us but I am proud to know that I am in the right place along with my brothers Kevin Mote, Steve Tilka, EJ Malave, Phil Chang, Jeremy Whitehouse, Mike Funke, Paki, Lefefe, Jack, Dave, and Ben.  Refiner’s fire is the experience.  Everybody goes through the refiner’s fire in their own unique way, but what really matters is how you come out.  Some of us may have to go through it a few more times to come out better, but in life everyone goes through it.   Thank you Grand Master Fernandez for spending your time with us here in Tacoma Washington.  It has been an amazing impact in my lifetime through such a short period of time.  I look forward to more of it.  Thank you all again.

Tuesday, May 22, 2012



WING TCHUN DO SEMINAR
Featuring 
Grand Master Paul Fernandez
From Vassai, Italy 
second generation lineage to the Legendary Great Grand Master IP MAN
June 2ND noon till 3pm 
Cost - $50.00 at the door
Location
Pinnacle Martial Arts 
9717 160TH St. E. 
Puyallup, WA. 98375
For further info: Contact Sifu Hill @ 253 297 0253

Wing Tchun Do Was Founded in 2005 by  Master Fernandez. Who began his martial arts training in the latter part of 1972 under the direct legendary Great Grand Master Ip Man Lineage of GM Tsui Shun Tin in Australia. He trained with great passion and dedication under the late Master Jim Fung from 1972 till the early 1990's. He then learn a variation of Wing Chun from noted Wu Shu Master Cangelosi in Genoa, Italy , in which he studied for approximately 2 years. 1992 the GM Leung Ting Lineage under Sifu Stefan Fischer and became his personal student for 7 years. Personal student of Sifu Cuciuffo, Grand Master Keith Kernspecht and then finally moved on to becoming GM Leung Ting's private student for about 3 years. In that period he also had the opportunity to learn directly under the second highest ranked Wing Tsun in the world Grand Master Chen Chuen Fun. He has also had the privilege to learn under many masters that completed the Wing Tsun system such as noted Master Delisio, (to whom he learnt the wooden long pole, and the Bart Chum Dao directly under Master Stellato in Caserta Italy.


Friday, May 4, 2012

Wing Tchun Do USA

One of the first things we learn in Wing Tchun Do is  Sil Lim Tau "Little Idea" the first of four empty hand forms and its concepts.We start with center line theory,  facing the opponent square-on, to achieve a favorable position even before the combat has started. If you are face to face with an opponent, the shortest distance to the opponent is a straight line from your center to the opponent's center. If you put your Jong Sau "ready stance" toward your opponent's vertical axis you occupy the center line. Two physical objects can't occupy the center at the same space at the same time. If a straight-line strike comes toward your face and you stick your hand in the center, then that strike will be deflected away from the centerline. 
There is a vertical centerline which runs parallel to the vertical axis of the body. There is also a horizontal centerline which runs from your vertical centerline to the opponent's vertical centerline.  
In Wing Tchun Do we try to face our opponent's center line. We don't let the opponent get to our side. One's goal is to maintain proper facing. In fact, in a fight we can't always maintain this facing, both bodies are in motion which keeps the centerline in motion. It takes footwork and proper turning of stance to maintain control of the centerline. When your opponent's does not maintain his centerline a hole is created and a path for your strike is formed. The hands follows the movement of the body, and the waist and the stance move together. When you have a perfect center position it's difficult for an opponent to penetrate this position with any kind of attack. 
If an opponent attempts to do a circular strike, we strike first with a straight-line attack.
If an opponent uses brute strength to break down the center, he'll be stiff and can be pushed, pulled, jerked or easily unbalanced. The other option is that the opponent's strength will encounter nothingness  from your relaxed, soft feeling. Or when their hard force comes we pivot or shift so the hard force is redirected. The opponent will face the wrong way and we will point at their central axis.
If an opponent attempts to kick, while engaged this attempt can be felt in the hands and a pushing/pulling force or stepping in will unbalance them. Since we are human, mistakes are made, the most common mistakes are, unstable stance, off center to the left, off center to the right,  hands too high, hands too low, hands too stiff, hands too soft, not sensitive, slow reactions and contact between the arms too loose.
We can all improve our Wing Tchun Do by following the centerline theory by practicing the Sil Lim Tau form daily.
Written By Sifu Jody Hill