3-3-1 "Junk" Zone Defense 

This video explains a defensive scheme for ultimate frisbe that combines a 3-3-1 zone concept with a "junk" defensive front. Because of its relative simplicity, it is easy for new players to learn and its effectiveness against inexperienced handlers makes it ideal for youth or casual league play.
This video is part of a larger series designed to teach the basic strategies used in ultimate frisbe.