Conversation with Nelson Wagner - physical educator, martial artist, and chief instructor at Systema Brazil. Having studied a wide range of martial styles - including kungfu, kendo, aikido and krav maga - Nelson was first exposed to Systema in 2003, and became an instructor at the 2008 Summit of Masters event. He now teaches defensive tactics to military, prison, and federal agent groups, along with regular classes at his school in São Paolo. Here, we discuss: