This article provides helpful tips on how to be an effective handler on defense in ultimate frisbee. It explains the importance of being in the right place on the field, how to properly mark the thrower, how to pressure the thrower, and how to disrupt their throwing angle. It also discusses the importance of knowing when the time is right to take risks and gamble on the play. Finally, the article provides guidance on how to use the advantage of being an offensive player when on defense.