Challenging the Mind Through Jeet Kune Do by Tom Barell
Jeet kune do challenges the student to discover the great inner force which exists within all of us.
Among the many training methods within jeet kune do lies a unique concept that pushes the student's ability above and beyond the call of duty. This concept is simple, straightfoward, and effective.
This concept is the ability to develop and enhance the neurological system of an individual as it relates to combat. And it is similiar to many training methods employed by the United States military and other hard-core instructional camps.
The objective is to prepare the student for combat by subjecting him to conditions that border on the realm of reality for the purpose of enhancing skill. It would be similiar to subjecting a person who wants to be an outstanding swimmer to forces and conditions far beyond the bounds of probability. For example, try placing a blindfold on the individual or changing the lighting conditions repeatedly and rapidly, forcing the person to swim with heavy cumbersome clothing, subjecting that individual to loud disruptive noises, or altering the physical state of the water in which he is forced to swim.
By handicapping the individual in a way that will enhance his skill or by altering the environment to which he is subjected, you'll force the neurological system of the individual to adjust to the rigorous training as if it were the norm and not the exception.
Amplification

It is the intention of a good jeet kune do instructor not only to convey concepts and techniques to his students, but to present them in a way that will enable that individual to expand and improve upon them. Thus, the techniques and concepts are taught to the student in several different phases of instruction-fundamental phase, an integration phase, a functionalization phase, and finally, an amplification phase.
In the fundamental phase (usually the first phase), the student is taught the technique with the intention of developing the fundamental attributes necessary for that technique to work. Concentrated on are such attributes as form, body mechanics, footwork, coordination, power, speed, rhythm, and timing. Without these fundamental attributes, the technique will become a weak link in the chain of techniques that make up the structure of jeet kune do.
The integration phase is where the technique is introduced in a new light. In this phase the technique is blended with other fundamental techniques from the various styles that encompass JKD, which will breed a new, stronger technique. It is a technique that can now flow more smoothly and blend together well with other techniques.
It is then that the technique, in its transformation, is brought into the functionalization phase to test its validity. This is the phase where reality enters the classroom and fair-play rules are left at the door. Techniques and attributes are put to the test to further enhance skill and style. This phase also allows the student to develop key attributes such as killer instinct and broken rhythm. It is also a phase where strategy and economy of motion are explored and developed. Safety, however, remains a primary concern, therefore the instructor should use his discretion where applicable.
It is usually after this phase or in conjunction with this phase that an amplification process is introduced. This amplification phase excels the scope of the technique and of the individual's attributes beyond the bounds of probability. It borders on the realm of practicality for the purposes of enhancing skill. This is where that swimmer earns his certificate of merit.
One method used in this amplification phase is called "filling the gaps". Every technique, whether offensive or defensive, has what we call "gaps". It is also sometimes referred to as "dead space". It is the space before, after, and in conjunction with the technique that make up these gaps. It is here that we fill those gaps for the purpose of amplifying technique.
For example, there is a technique in jeet kune do called "pak sao". This is an elementary technique originating from wing chun and refined and reformed in JKD. Now to further amplify this technique, it is surrounded and compounded with other techniques to make it difficult to execute. The student is called upon to execute this compounded pak sao in the same time span it took prior to its amplification. Once that level is reached, the technique is brought back to its original form, so now that when the student is simply asked to do a pak sao, it is as though the technique were elementary and second nature. It would be similiar to you being asked to run 50 yards, except you're wearing only one sneaker, while carrying a bowling ball in one hand and a pool cue in the other. Eventually you would become proficient at it. However, remove those handicaps, and expect a significant improvement.
Remember, the student is merely filling the gaps for the purpose of amplifying technique. Since it is going to be removed from the technique anyway, it really doesn't matter what technique was added for this purpose. However, keep in mind, the added technique shouldn't in any way drastically effect the proper execution of the original technique. Therefore, it would be best to fill gaps with low line kicks, knees, and footstomps.

Attribute Enhancenent

As you know, attributes-more so than technique-are what ultimately determine the outcome of a fight. Therefore it is essential that attributes are developed, refined, and enhanced. There are methods within jeet kune do (through its amplification process) that dramatically enhance attributes. One way of enhancing key attributes, such as timing and comprehensive speed, would be to introduce kali into jeet kune do. Kali is an art from the Philippines that has its origins and foundation in weaponry. Through the use of its two main weapons-the straight stick and knife-certain neurological elements can be ascertained to enhance attributes.
There are several drills in kali that involve the tracking and disarming of the opponent's weapon. Two major elements are spotlighted during these drills. One is the obvious danger involved whenever a weapon is introduced. This compounded danger promotes an adrenaline flow which can greatly enhance other attributes. The other element involved is the knowledge that a weapon such as the straight stick can travel four or five times faster than the quickest empty-hand technique. This forces your neurological system to adjust to the amplified pace. This factor is similiar to a race car driver who is used to driving a car 200 mph or more around a crowded oval. When that individual now drives on the highway doing 55 or 60 mph, it seems to him as if he is crawling. Therefore, if someone were to cut him off, he should be able to respond with relative ease.

Intensity

Throughout the development of both the functionalization and amplification phases of JKD, the student must maintain a certain level of intensity. Intensity is the ability to remain focused on the task at hand and ignore outside influences. It is the ability to transform yourself from the friendly environment inside the school to the life-threatening street environment.
To promote confidence, pain tolerance, and killer instinct, the student of JKD must rely on a strong intensity level. Imagination and visualization help to promote and develop a strong intensity level. The student of jeet kune do must be able to wear two hats: one signifies a friendly, easy-going pre-class atmosphere while the other carries the aggression needed for class.
It is through concepts and training methods such as these that the JKD student can expand upon his individual skills. To personify jeet kune do is to understand jeet kune do.