Deliberate practice exercises provide trainees and students an opportunity to build competence essential rational emotive behavior therapy (REBT) skills while developing their own personal therapeutic style.   These exercises present role-playing scenarios in which two trainees act as a client and a clinician, switching back and forth under the guidance of a supervisor. The clinician improvises appropriate and authentic responses to client statements organized into three difficulty levels—beginner, intermediate, and advanced—that reflect common client questions and concerns.   Each of the first 12 exercises focuses on a single skill, such as psychoeducation, assessing and disputing irrational beliefs, helping clients differentiate maladaptive vs. adaptive behaviors and emotions, teaching clients the ABC model, and developing homework assignments. Two comprehensive exercises follow in which trainees integrate these essential skills into a single REBT session.   Step-by-step instructions guide participants through the exercises, identify criteria for mastering each skill, and explain how to monitor and adjust difficulty. Guidelines to help trainers and trainees get the most out of training are also provided.