To become a graduate assistant softball coach, you need a bachelor's degree and be enrolled in a master's degree program at the school where you are coaching. Softball coaches expect graduate assistants to have extensive knowledge of the game and rules of softball and understand how to maintain softball equipment properly. Prior experience playing collegiate softball and a background in coaching or leadership is also helpful. To demonstrate your skills, you can obtain an Athletic Training Certificate by passing the Board of Certification exam. The credential shows employers you are familiar with injury and illness prevention, therapeutic intervention, and understand the science of athletic skills and training.