It was formed from Lee's experiences in unarmed fighting and self-defence—as well as eclectic, Zen Buddhist, Confucianist and Taoist philosophies—as a new school of martial arts thought.

[12][13] At the heart of Jeet Kune Do lies the principle of intercepting the opponent's attacks, crafting responses or counterattacks that effectively target the adversary's offensive moves.

JKD also incorporates a set of principles to help practitioners make instant decisions and improve the physical and mental self,[14][15] being intended to have practical applications in life without the traditional routines and metaphysics of conventional martial arts.

[15][16] As an eclectic martial art, it relies on a fighting style heavily influenced by Wing Chun, Tai Chi, taekwondo, boxing, fencing and jujutsu.

However, in America he called what he taught Jun Fan Gung Fu [d][3][20][21][22] However, around 1964, following his encounter with Wong Jack-man, Lee disavowed the rigidity of systematized martial arts.

[23][24] Following this, Lee began a journey of research in order to refine his way of practicing martial arts.

Initially, Lee wrestled with putting a name to his art as he constantly veered away from any type of crystallization of its essence; however, the simple need to refer to it in some concrete way led him to decide upon a name for it.

[27] Lee considered traditional form-based martial arts, which practiced pre-arranged patterns, forms and techniques, to be restrictive and ineffective in dealing with chaotic self-defence situations.

Lee believed that many non-verbals and telegraphs (subtle movements that an opponent is unaware of) could be perceived or "intercepted" and thus be used to one's advantage.

A JKD student is encouraged to study every form of combat possible, both to add to his arsenal and to know how to defend against such tactics.

[citation needed] JKD practitioners believe that techniques should contain the following properties: The centreline refers to an imaginary line running down the centre of one's body.

This notion is closely related to maintaining control of the centre squares in the strategic game chess.

[citation needed] The three guidelines for centreline are: Although Bruce Lee officially closed his martial arts schools two years before his death, he allowed his curriculum to be taught privately.

Bruce Lee claimed there were inherent problems with this approach and established a "Process" based system rather than a fixed style which a student could then utilize to make a "tailored" or "Personal" product of their own.

[citation needed] JKD Concepts branch believe that there are further principles that can be added to construct personalized systems.

He also did exercises simulating a fight against a four-limbed human using the traditional Mook Yan Jong used in Wing Chun.

The training routines Lee used included isometrics as well as "the cat stretch", "the squat" (known as "baithak"), and also known as the "deep-knee bend.

"[33] Kato from Green Hornet is the first fictional character to use Jeet Kune Do, as he was portrayed by Bruce Lee in the 1966 TV series.

[2][34][additional citation(s) needed] Following Lee's impact and death, Kato would utilize JKD in subsequent incarnations of Green Hornet media.

[citation needed] In Arrow, Jeet Kune Do is the martial arts style of the League of Assassins.

[citation needed] Various video game characters utilize Jeet Kune Do as their choice way of fighting.