Jeet Kune Do, the scientific art of streetfighting developed by the late Bruce Lee, is based on real street defence. The training is geared towards realistic combat with none of the fancy forms or techniques that can be seen in many of the other combat arts. This text covers essential areas pertaining to streetfighting; among them are centre line theory, longest weapon to nearest target, an extensive look at the Big Jong position, visual focus principles, intercepting and countless streetfighting applications.