This article explains how to play a strategy called "Horizontal Stack" in Ultimate Frisbee. The Horizontal Stack helps teams spread out across the field and effectively use the sideline to their advantage. It also goes over the responsibilities of each player as well as the various ways to set up the stack. The article also provides tips on when to use the stack and when it might be effective. Finally, there is a detailed description of the offensive and defensive movements that should be used when playing the Horizontal Stack.