This document discusses Brazilian Jiu Jitsu as an effective self defense system. It outlines different self defense systems including striking and grappling arts. It explains that grappling techniques are more energy efficient than striking as they rely on leverage rather than strength or stamina. The document then describes the methodology of Brazilian Jiu Jitsu, which focuses on gaining a dominant position, exerting control over the opponent, and executing a finishing submission. It argues that BJJ is suitable for self defense even against larger opponents due to its emphasis on using an opponent's strength and size against them.