This article provides a step-by-step guide to throwing a thumber, a type of throw used in ultimate frisbee. It explains the proper grip and body mechanics, with the goal of creating a throw that is accurate and easily-catchable by the intended target. The article covers the importance of footwork and body movement, giving tips on how to move your body in such a way that will benefit your accuracy. Finally, it provides tips on how to practice and perfect the skill so that one can become an expert thumber thrower.