Golf instruction involves the teaching and learning of the game of golf. Proficiency in teaching golf instruction requires not only technical and physical ability, but also knowledge of the rules and etiquette of the game. In some countries, golf instruction is best performed by teachers certified by the Professional Golfers Association. Some top instructors who work with professional golfers have become quite well-known in their own right. Instructors use a combination of physical conditioning, mental visualization, classroom sessions, club fitting, driving range instruction, on-course play under real conditions, and review of videotaped swings in slow motion to teach golf.