Jeet Kune Do

Bruce Lee and the development of JKD

Bruce Lee trained in Hong Kong under Ip Man in Wing Chun. After moving to the United States, he expanded his studies to include Western boxing, fencing, wrestling, and other martial arts. He initially taught under the name Jun Fan Gung Fu.

Around the mid-1960s, Lee’s focus shifted from a fixed system to an investigative method that could respond to the uncertainty of a real confrontation. In 1967, he used the name Jeet Kune Do. However, Lee opposed the idea that JKD should become a rigid, closed style.

Lee’s philosophy was influenced by his experiences with fighting and teaching, as well as by ideas from Chan Buddhism, Taoism, and Confucianism, among others. He did not finalize JKD as a single formal examination or organizational system. As a result, later teachers developed different interpretations.

Jun Fan, Original JKD, and JKD Concepts

After Lee’s death in 1973, different approaches emerged to preserve and further develop his legacy. Original JKD and Jun Fan JKD generally place greater emphasis on historically transmitted techniques and training methods. JKD Concepts more often emphasizes continuing Lee’s investigative approach and adapting principles to individual characteristics and complementary disciplines.

The terms are not used consistently by all organizations. Lineage claims, the role of specific students, and the question of which content counts as “original” remain subjects of debate.

Philosophical core

The three often-mentioned qualities of JKD are efficiency, directness and simplicity. The practitioner examines what is useful, takes personal characteristics into account, and avoids movements or traditions that no longer serve a purpose.

This does not mean that JKD is practiced without method, training, or discipline. Well-structured drills, realistic but controlled resistance, and critical evaluation are precisely what make it possible to responsibly develop a personal approach.

Conditioning and Bruce Lee

According to biographical sources, Bruce Lee used isometric exercises, stretching and mobility exercises, deep knee bends, boxing training, and traditional training equipment such as the Wing Chun wooden dummy. This describes his personal preparation and is not a mandatory JKD program.

Conditioning and contact training should be built up gradually. Forearm conditioning, dummy training, and intensive knee or strength training can cause injuries if performed incorrectly.

JKD in film, television, and games

Bruce Lee’s role as Kato in The Green Hornet made movements and ideas associated with JKD visible to a wide audience. Other productions, anime, and video games use JKD as inspiration or reference, but a similar fighting style is not automatically an official JKD classification.

Train safely

JKD training may include punches, kicks, locks, throws, and ground work. Therefore, train with a qualified instructor, appropriate protective equipment, and clear agreements about the level of contact. De-escalation and avoiding violence take priority over any technique; self-defense training does not guarantee safety in a real confrontation.