This chapter explores some of the most central aspects of the psychology of coaching. The goal of which is for consultants to provide coaches with the psychological, emotional, and interpersonal insights, information, and tools they need at several levels. J. Cote & W. Gilbert’s comprehensive definition of coaching effectiveness will be used as the guiding framework for optimal sport coaching; however, it is valuable to deconstruct some of the consistent practices across optimal sport coaches. Despite the fact that most coaches express clearly the importance of mental training for athletic success, few coaches understand the behaviors that underpin this relationship. With key mental training muscles and exercises defined, consultants can then show coaches how to incorporate mental training on and off the field. In addition to the models just described, two other areas of research have been receiving attention as important contributors to effective coach–athlete relationships.