At the end of 2023 I gave a presentation at Youngsan University's 4th International Taekwondo Conference on the muhyeong-principle in ITF Taekwon-Do. It has been my intention to develop it into an academic paper to submit with a journal, but I've been too distracted to work on that, so I'm deciding to share my draft here on my blog to the benefit of the ITF community, while I hopefully finish the paper for publication in the future.
From Decisiveness to Adaptability: The Muhyeong-Principle in (ITF) Taekwon-Do
Introduction: Karate's Kime and Taekwon-Do's Jipjung
Taekwondo developed from a Japanese karate—mostly Shotokan Karate—foundation and although Taekwondo evolved into a uniquely Korean martial art, it still retains remnants of both technical methodology and philosophy that are rooted in Japanese martial culture. One example is the notion of kime (決め), which refers to the conspicuous full body tension performed by the karateka at the final moment of a technique. From a technical perspective, this full body tension is supposed to make the body into a solid, immovable structure to fully transfer the technique’s force into the target and prevent possible negative effects from any rebound force. The term kime literally translates as “decision,”[1] and connotes firm decisiveness; in other words, kime suggests an unwavering execution of the technique decided upon. The isometric concentration of the whole-body musculature in kime is a manifestation of the karateka’s decisive technique. This unwavering decisiveness also manifests in the early formation of the attacking or blocking tool. When performing techniques in karate, the practitioner will keep the hand shape the same from start to finish. For instance, if the technique to be performed is a punch the hand will remain in a fist shape from beginning to end; similarly, if the technique is to be an open-handed strike, the hand will be kept in the knife-hand shape throughout the execution of the movement. This consistency in the “form” of the hand reflects kime’s connotation of an unwavering decision: once the decision to perform either a punch or a strike is made, it is resolutely executed. Within the broader context of Japanese martial arts, one may understand kime, then, as a technical expression of another idea in some Japanese martial arts, including Shotokan karate, namely: ichigeki hissatsu (一撃必殺) which translates as “one punch, certain death” or the more euphemistic expression ichigeki hitsutou (一撃必倒), “one punch, certain victory”.[2] As such, kime which is primarily a biomechanical feature in karate also lends itself to psychological or philosophical interpretation.
Taekwondo inherited a version of kime from karate. But in taekwondo it is known as jipjung (집중), which translates as “concentration” or “focus”; the term is based on the hanja 集中, which literally translates as gathering everything together to a central point. As such, Taekwon-Do’s jipjung is employed “to concentrate every muscle of the body … towards the appropriate tool … at the proper time … onto the opponent’s vital spot”[3].
In Kukki Taekwondo (the style of Taekwondo under the auspices of the Kukkiwon) the shape of the attacking or blocking tool is also predetermined like in karate; in other words, a punch will start from the hip in the shape of a fist, and a knife-hand strike will also be in the knife-hand shape from the very start of the technique. While the physical manifestation of kime is still visible in the performance of taekwondo’s fundamental movements—for instance in poomsae—, the associated Japanese philosophy of a decisive, victorious action is somewhat lost in translation, as the Korean word jipjung doesn’t have the same decisive connotation as is the case with the Japanese word kime. Instead, taekwondo’s jipjung implies the bringing together of all elements, movements, circumstances, and mental focus into a focussed point; in other words, one’s total energy focussed into the metaphoric bullseye by means of a perfect technique.
ITF Taekwon-Do also retained the kime / jipjung principle of a whole-body isometric contraction at the final moment of the technique; however, the predetermined formation of the attacking or blocking tool has disappeared from ITF Taekwon-Do’s techniques. In ITF Taekwon-Do, techniques must initiate from a state of relaxation, and unnecessary tension of muscles while performing a movement is strongly discouraged as any engagement of antagonist muscles is believed to negatively affect the speed and resultant power with which the technique can be performed. Therefore, in performing a hand technique, the hand is kept relaxed and without any predetermined form; it is only concentrated into its appropriate shape moments before impact. For example, when performing a punch, the hand remains in “no-form” (neither flexed open nor tightly clenched closed) [4] and only concentrates into a fist as the hand nears the target; similarly, when performing a knife-hand strike the hand is relaxed into the hand’s natural unengaged shape and not prematurely opened into the knife-hand shape—the hand will only stiffen into this striking tool prior to contact with the target and during the moment of jipjung.
States of Muhyeong and Yuhyeong
While the full body tension and the moment of contact with the target does have a designation in Taekwon-Do, namely jipjung, thus far this relaxed methodology that encourages a “no-form” shape of the hand does not have an official nomenclature—apart from general descriptions such as “relaxed” or “lightly clenched” and “not tightly clenched”. After research and discussions with various Korean martial art scholars I decided to designate the Sino-Korean word muhyeong (무형, 無形), which literally translates as “no form” or “without form”—implying something that is “intangible” or “amorphous”—for this principle. This is a fitting description for this relaxed “no-form” aspect in ITF Taekwon-Do techniques before they have morphed into a recognizable tool such as a knife-hand or fist shape. Inversely, the word yuhyeong (유형, 有形), meaning “physical form” or “tangible shape” can be applied to describe the attacking or blocking tool when it has “formed” into its appropriate shape moments before and during the final jipjung-climax.
Of course, it goes without saying that when we describe the hand as being in a state of muhyeong we do not mean it literally, as if the hand is liquid or vaporous. The hand still retains the natural bio-tensegrity or fascintegrity that is innate to the living structure of complex organisms.[5] Also, the wrist is never allowed to go limp, but is kept in a neutral position, neither bent up or down nor left or right. A hand in a state of muhyeong simply means that it is naturally relaxed and not formed into a blocking, attacking, or grappling tool. Contrariwise, a hand in a state of yuhyeong is formed into a specific tool. Muhyeong has the primary biomechanical function of keeping the limb relaxed (iwan, 이완, 弛緩), free from unnecessary antagonist muscle tensions so as not to hamper the technique’s speed.
Techno-Philosophical Interpretation
Apart from its primary function as a method for relaxing antagonist muscles, the muhyeong-notion is also ripe for further interpretation.
Different Approaches: Decisiveness versus Adaptability
In Karate, kime, as a “decisive” action, implies that once the karateka decides on a technique they ought to be fully committed in its execution, hence the shape of the attacking or blocking tool is predetermined and remains the same from start to finish. It would be considered “wrong,” within the Karate-context, to change one’s mind halfway through the execution of the technique. For instance, once the karateka decides to do a fore fist punch, it is improper to second-guess the decision and suddenly change the technique into a fingertip thrust, as techniques should be performed without hesitation. As such, kime in Karate resonates with a similar idea in several Japanese martial arts, namely sutemi (捨身). A literal translation of sutemi is “abandoning the body,” suggesting self-sacrifice. The implication is a total commitment to every technique without thought of any repercussions. Hence, the highest point one can achieve in Judo is called an “ippon” (一本), translating to one full point or decisive victory[6]. Both kime and ippon emphasize the importance of decisiveness and achieving a clear outcome attained by complete commitment to executing a technique with full intention and power.
On the other hand, the muhyeong-principle in ITF Taekwon-Do frees the practitioner from such predetermination. Since the attacking or blocking tool only fully manifests in a proper shape (yuhyeong) towards the end of the movement, the Taekwon-Do practitioner is theoretically free to adapt the technique as the situation changes. Therefore, it is quite acceptable within the Taekwon-Do context to change a technique strategically: a punch may become a backfist strike; a front kick may suddenly change into a turning kick; a side kick might suddenly morph into an offensive hook kick. Those familiar with Taekwon-Do sparring will immediately recognize this as a common strategic feature of Taekwon-Do. For instance, kicks are often adapted mid-execution to adjust for the opponent’s movements or to exploit new openings in their guard. Furthermore, this helps to prevent a level of telegraphing, because even when the movement has started the exact technique is not fully knowable until near the end of its execution.
Relation to East Asian Philosophy
I believe that this muhyeong concept is consistent with some East Asian philosophical ideas that have a long historic association with East Asian martial arts theory.
Eum-Yang
First, the Daoist concept of taegeuk, (태극; Chinese: 太極, taiji) and its associated eumyang-principle (음양; Chinese: 陰陽, yinyang), is a core idea in East Asian cosmology and often used by East Asian martial arts as a theoretical bases for describing techniques. There are already several approaches for understanding the eumyang-principle in taekwondo. For instance, Dr Stephen Capener argues for interpreting the eumyang-principle as “full and empty space” to explain Taekwon-Do sparring strategy.[7] For him, during a sparring match, the dynamic interchange of the competitors’ limbs in motion and inevitable appearance and disappearance of viable targets for attack represent “full” and “empty” spaces. An understanding of such full and empty spaces allows for both strategic sparring application and philosophical interpretation. Furthermore, some Korean scholars promote the idea of gangyu (강유, 剛柔), meaning “hardness and softness,” as an application of the eumyang-principle in Taekwon-Do but viewed through a Neo-Confucian lens. Gangyu can basically be understood as those particular binary aspects in Taekwon-Do, such as offensive and defensive techniques. My proposal of “form” and “no-form” (in ITF Taekwon-Do) is likewise an exploration of the eumyang-principle. If a Taekwon-Do technique has a moment of deliberate high tension, where the whole body is concentrated into an unmoving, isometric firmness (in other words, jipjung), it only makes sense that it should also have the opposite, namely a phase of deliberate relaxation (iwan) and fluidity. Similarly, since a technique is only recognized as such at the final moment when it expresses into its clearest form (yuhyeong), it goes without saying that it also has a preformed or amorphous state (muhyeong).
Muwi
This muhyeong idea, which allows a practitioner a level of liberty to adapt the technique naturally according to changing circumstances resonates with yet another concept from Daoist philosophy, namely muwi (무위; Chinese: wuwei, 無為), which translates as “non-doing” or “no effort”. Within Daoist teaching, this doesn’t literally mean to not do anything, but rather not to force a situation and instead allow things to unfold naturally. Many martial arts have taken up the muwi principle to mean that a good technique is one in which the greatest result is achieved with the least amount of effort. This principle of efficacy directly relates to the biomechanical purpose of muhyeong which is to ensure that only the necessary agonist muscles are engaged in their proper sequence, and the antagonist muscles are appropriately relaxed, subsequently resulting in the most efficacious movement.
Mugeuk and Mushim
Furthermore, in Daoist thought mu (無) does not mean mere nothingness; instead, it relates to the “Void” (無極; Korean: mugeuk, 무극), the place of incipience, which contains all potentialities. For the trained martial artist this connects to that spontaneous, reflexive, and masterful bringing forth of the right technique at the right time; in other words, the most appropriate technique hitting the best target at just the right moment. This is different from the kime-concept that implies an active decision. From a Daoist paradigm, the most appropriate technique is not “decided” but rather allowed to manifest without conscious thought naturally and spontaneously. Just as the hand can be described as in a state of muhyeong, so the whole person—body and mind—may manifest muhyeong. This is not conceived as a structureless body and unconsciousness mind, but rather as a body filled with potentiality and a mind open to all options. Daoist and Buddhist meditative practices calls this mental state mushim (무심; Chinese: wushin, 無心; Japanese: mushin). Mushim suggests a mental state of no-mindedness; or a “mind empty of all thought or emotion” so that it is able “to respond to any external stimuli, allowing free expression of any response technique.”[8] In other words, the ability to do defensive and counter-attack techniques reflexively, without thinking.
This muhyeong state is of course a transitional state, from a state of potentiality to the yuhyeong state of actuality. As the transition happens, the various potentialities or technique possibilities become fewer and fewer, until finally only one possibility remains. In practise this means that the movement starts out relaxed, but slowly more muscles will become engaged until finally all muscles are engaged. Thus, yuhyeong and jipjung converge. When, from the vast sea of potential techniques, the most appropriate technique is actualized, perfection occurs. Or as Capener puts it: “bringing order to chaos through skillful technique.”[9] Of course, for this to occur the practitioner must have physically mastered various potentialities, which is a great arsenal of efficacious techniques (or fundamental movements). Only then can the most appropriate technique come forth without conscious thought or physical restraint. As such, muwi as a philosophical extension of muhyeong does not mean no effort in training, but rather so much training and mastery of techniques that when a technique is performed it seems effortless, which is—as all martial artists know—the difference between the novice and the expert. This implies that fundamental movements ought to be trained—or rather—drilled to such a level that they can manifest effortlessly.
Practical Considerations
Returning from the philosophical to the practical, there are important technical aspects regarding the point of impact with the target that is crucial to discuss. We may ask: ‘When, during the execution of the movement, is the moment of contact with target?’ To make the question more tangible, let’s focus on a specific technique, the front fore fist punch: ‘When performing a front fore fist punch, at what point of the arm’s extension (and the hand’s rotation) should the fist reach its target?’ Asked differently, ‘When should the full transformation from muhyeong to yuhyeong occur?’
There are two reasons these questions are crucial. First, if the hand is still in a state of muhyeong at the moment of impact with the target, there is a high possibility of the hand getting injured since it is not formed into a proper, stable attacking tool (yuhyeong) that can withstand the force of the impact. It is therefore imperative that the hand not make impact with the target too early. Second, all techniques accelerate and then suddenly decelerates at the end of the movement. The deceleration can happen either because it reached its target (e.g., the fist hits the opponent), or because the arm has reached its full extension, which means it naturally stops. The implication of this is that since force is the product of mass times acceleration, the highest moment of the technique’s force cannot be at the very end when the limb is fully extended, as by that time it has decelerated to zero. Ergo, the highest moment of potential force is a point along the trajectory, when the limb is at its highest point of acceleration, before any deceleration starts. Therefore, we want to ideally hit the target at this point when the limb’s speed is at its greatest, which is a point before the limb is fully extended. But how can we know when that is?
Taekwon-Do convention advocates that when performing a front fore fist punch, the punch should rotate upon contact with the target. Various reasons for this rotation are proposed, but I’ll leave that aside for now. What I want to focus on here is simply that, according to tradition, the fist should rotate on the target. What this implies, then, is that the moment the fist starts rotating is also conceivably the moment of initial impact—the full rotational corkscrew of the fist is supposed to coincided with the deeper penetration of the technique towards the true target that is beyond the surface skin. For instance, when we aim for the solar plexus, we are not merely aiming for the spot right under the sternum, but rather for a point deeper within the torso.[10]
Different instructors promote different times in the execution of the punch for the rotation to occur. Some suggest the final third of the movement, others say at the last quarter before full extension. Unfortunately, scientific studies that measure the highest moment of acceleration in all ITF Taekwon-Do techniques are yet to be done.[11] There are, however, some studies with regards to punches in Karate and Kukki Taekwon-Do worth mentioning. Based on punching experiments mentioned by Master Nakayama, the “maximum speed occurs at just around 70 percent of full extension”[12]. An academic article focussing on Karate punches states that the “maximum speed was recorded as a point between 70 and 80 [percent]” of full extension.[13] The Kukkiwon’s Taekwondo Textbook (2022) suggests that this point is at “80% of the arm’s length”.[14] So the oral tradition in ITF Taekwon-Do that advocates for the rotation to start at around the final quarter of the movement seems to be correct.
What this suggests is that by this point (i.e., the point of highest velocity), yuhyeong (i.e., the formation of the attacking tool) ought to occur. Of course, the point of highest velocity will be slightly different depending on the technique and also purpose. But until scientific research is done to determine the likely points for different techniques, we can—for practical purposes—assume the same rule of thumb that the point of highest velocity occurs at roughly 75% of the full extension of the limb, or around the final quarter of the technique.
Earlier in this discussion it may have seemed that I equated yuhyeong and jipjung. However, based on the preceding it is obvious that this is not the case. Yuhyeong occurs slightly prior to jipjung. Yuhyeong (the formation of the tool) happens at around three-quarters of the movement, while jipjung (isometric concentration of the whole body) is a bit closer to the end of the movement. However, the precise commencement of the two are within fractions of a second of each other. Though they do conclude at the same time.
Conclusion
A very important departure in ITF Taekwon-Do’s evolution out of Karate is the muhyeong-principle. This kinaesthetic principle has technical, strategic, and philosophical applications and implications. Technically it contributes to more relaxed movement which are theoretically capable of greater acceleration. It is important, however, to keep practical considerations in mind when employing the muhyeong-principle. While muhyeong may have some technical advantages, it may also lead to possible injuries when practitioners fail to apply yuyeong in time. For instance, if it is not formed into an appropriate blocking, attacking, or grappling tool before contact with the opponent, the hand might be injured. Strategically, the muhyeong-principle allows for greater adaptability. Taekwon-Do techniques are allowed to change mid-execution to adapt for changes in the combat dynamics. This level of freedom may have contributed to Taekwon-Do’s creative expression that led to the creation of various innovative techniques. And philosophically the muhyeong-principle resonates with Daoist concepts such as muwi and mushim. For people who find this East Asian philosophical interpretations too esoteric, I recommend another interpretive lens, that of Sport Psychology. The same muwi and mushim ideas can be understood as part of the “flow” state, which is a mental condition where an athlete is fully immersed in their performance; it is often described as being “in the zone,” where athletes experience a merging of action and awareness, making their performance effortless and automatic.
[1] The equivalent Korean word is gyeoljeong (결정, 決定), meaning decision or resolution. However, this term is not commonly employed to describe Taekwon-Do techniques.
[2] General Choi famously also made a calligraphy of this phrase (一撃必倒), which is printed in the ITF Taekwon-Do Encyclopaedia. The Korean (일격필승) Romanizes as ilgyeok pilseung.
[3] Choi, H. H., (1999). Encyclopaedia of Taekwon-Do. Vol. 2, p. 20.
[4] Another Korean martial art, Subyeok-Chigi (수벽치기), which has a similar concept of not forming the attacking tool prematurely, calls this hand shape banjum (반줌), literally “half fist”. I use this term when I want to discuss the relaxed hand shape before it concentrates into a tool specifically; when I want to keep the philosophical idea of muhyeong and yuhyeong out of the discussion.
[5] Bordoni, B., Varacallo, M. A., Morabito, B., and Simonelli, M. (June 03, 2019). “Biotensegrity or Fascintegrity?” Cureus 11(6): e4819. DOI 10.7759/cureus.4819
[6] The ippon is to Judo what the knockout punch is to Western boxing: clear victory.
[7] Capener, S. D. (1995.) “Problems in the Identity and Philsophy of T’aegwondo and Their Historical Causes.” Korea Journal. (1995: Winter.)
[8] Rielly, R. L. (1998). Complete Shotokan Karate: The Samurai Legacy and Modern Practise. (p. 80.)
[9] Capener, S. D. (1995.) “Problems in the Identity and Philsophy of T’aegwondo and Their Historical Causes.” Korea Journal. (1995: Winter.)
[10] The solar plexus is a common target in many martial arts. However, few people realize how deep the solar plexus is within the body. What is known as the “solar plexus” is a cluster of nerves roughly 10-12 cm from the front surface of the body, nearer to the front of the spine. It is very unlikely that one would penetrate the body from the front with a punch deep enough to reach the solar plexus. The usual effects we witness from strikes to the solar plexus is probably due to the shock to other organs that are much closer to the surface, such as the diaphragm.
[11] Regrettably, I doubt there is an ITF organization with the desire to start such a project even though such studies would be invaluable to the scientific understanding of ITF Taekwon-Do. I can only hope that my work inspire other individual Taekwon-Do scholars with the knowledge and means to undertake such research.
[12] Nakayama, M. (1967). Dynamic Karate.
[13] Walker, J. D. (1975). “Karate Strikes”. American Journal of Physics. Vol 43:10 (pp. 845-849).
[14] Choi, C. & Lee, S. (2022). Taekwondo Textbook: 2 Basic. Kukkiwon.