According to the BLS, most coaches and instructors receive their training through participating in the sport for several years. Tennis teachers have often played the sport for many years, frequently at a competitive level. In fact, according to the USTA, "The average age of a professional tennis player is 28. The average age of an ATP Tour coach is 31." While it is not necessary to play the game yourself to be a good teacher, it does help if you experience some degree of skill yourself. This allows you to better understand how your students are performing, and provides a direct link with their progress. In addition, coaches need to be certified by a recognized body before they can work with players. There are several certification programs available, including those offered by the ITF, which covers background checks and disciplinary action. Coaches must also complete community service hours to be certified by most organizations. Finally, coaches must be licensed by their state agency as well. Some states require that coaches be trained and licensed separately from instructors because they cover different topics during teaching sessions. Other states' agencies combine the two roles into one license category. However, even though coaches need to be trained and licensed, these requirements don't always mean that they are qualified to teach certain skills or levels.