[ame="http://www.youtube.com/watch?v=1TQdDiaf1jA"]YouTube - The Canadians: A Defensive Positional Breakdown v1.5[/ame]

[ame="http://www.youtube.com/watch?v=vwrwGZPDoWA"]YouTube - Defensive Coverage[/ame]

[ame="http://www.youtube.com/watch?v=730IDuYb-Gw"]YouTube - Defensive Zone Coverage[/ame]