Watch on SFlix. Jeet Kune Do (also "Jeet Kun Do", "JKD," or "Jeet Kuen Do") is a hybrid martial arts system and life philosophy founded by world renowned martial artist Bruce Lee in 1967 with direct, non classical and straightforward movements. The system works on the use of different 'tools' for different situations.[2] These situations are broken down into ranges (Kicking, Punching, Trapping and Grappling), with techniques flowing smoothly between them. It is referred to as a "style without style".