Signing in athletes at the beginning of sessions is important for safety, relationship building, and attendance tracking. It should occur 20 minutes prior to the start of the session. Coaches should greet parents and children, sign them in, distribute materials, and direct parents and children to the appropriate areas. Key programs that require sign in are preschool sports, tennis, and basketball as attendance is taken for each session. The sign in process involves greeting the family, signing in the athlete, providing materials, directing parents and children, and getting athletes involved in an activation game before starting the session.