Bruce Lee's fighting method based on his principle which he called a style with no style, a modification of Wing Chun technique and considered as the precursor of mixed martial arts. Jeet kune do techniques (JKD) incorporate various styles in freestyle fighting which can be applied in real life and street fights.

According to Lee, a fighter needs to be like water that can adapt the shape of its surrounding and can be used to destroy and create something. The essence of the water is essential to fights and its economy of motion eliminates the waste of time. Practitioners believe that JKD goes beyond techniques because techniques are just tools and JKD is about using the tools effectively in any occasion. Its concept is by stopping hits and kicks through intercepting an attack with another attack instead of a normal block. The offensive attack is what makes JKD differs from other disciplines.

Martial arts practitioner and enthusiasts who admire Bruce Lee's jeet kune do (JKD), admire the straightforward system with minimal movement, maximum effect and high speed. Jeet kune do training requires practicing smooth flow of using tools like kicking, punching, trapping and grappling as the way of expressing the art of the human body. Many JKD instructors develop their own style on using these tools and become a deadly weapon. Many Bruce Lee schools emphasize training in footwork, striking, target emphasis, principles and concepts. Footwork trainings include step and side push shuffle, and pendulum step. Striking includes straight lead, finger jab, and hammer fist. Target emphases on attacking are usually the eyes, groin, and throat. JKD offers five ways to intercept such as the single angle, hand immobilization, progressive indirect, combination, and drawing attacks. While these trainings are tedious and demands serious physical conditioning, they equip the fighter to be prepared in direct combat.

When Bruce Lee settled in the U.S. in 1959, he founded his first Ju Fan Gung Fu or simply means Bruce Lee's Kung Fu in Seattle, Washington DC together with Jesse Glover as his assistant. When Lee moved to Oakland, he founded another school together with James Lee. James introduced Bruce to Ed Parker, an organizer of the Long Beach Karate Championship and Royalty of the U.S martial arts, and Parker introduces Lee Hollywood and JKD was known all over the U.S. after the filming of television series Green Hornet. Bruce got a lot of students and fans even martial arts instructors and after his death on July 20, 1973, many JKD schools sprang up which was started by his students. JKD do not have any rankings because Lee believed that rankings will boost the ego of a student. Lee believed that JKD is a principle of humility and an individual style of martial arts. But some jeet kune do schools make their own ranking system based on the phases from beginner to advance.