a specific problem they are encountering or to improve their game. Reconstruction of a golf swing to reach a high level of play often involves series of lessons over an extended period of time. Junior golfers often begin receiving instruction by age 10 or younger, and often retain private teachers even when coached on a high school golf team. Notable instructors Some top instructors who work with professional golfers have become quite well known in their own right over the years, including Harvey Penick, Jack Grout, Dick Harmon, David Leadbetter, Butch Harmon, Gary Wiren, Hank Haney, Chip Thomson, Sean Foley, Quentin Patterson and Mike Bennett and Andy Plummer. Some of the teachers maintain teaching facilities or schools where they or their disciples use their methods or systems. A few instructors focus solely on a particular aspect of the sport, such as Dave Pelz with the short game. Some famous golfers have been tightly bound with their instructor, such as Jack Nicklaus with Jack Grout, while in other cases golfers have made high-profile switches from one instructor to another, such as Tiger Woods moving from Butch Harmon to various other instructors. Golf instruction may be augmented by training aids such as specially weighting or jointed clubs, putting cups for practice on the den room carpet, mini practice tees with feedback for use in garages, et cetera. Some training aids are sold via television infomercials and the more peculiar varieties were satirized in the 1996 film Tin Cup. Publications and media Recreational golfers are constantly seeking tips on how to improve, and the major golf publications such as Golf Magazine and Golf Digest devote substantial portions of their pages to instructional material of various kinds, often written by top-level instructors. Even television broadcasts of professional golf tournaments often contain short instructional segments, delivered by commentators who are also instructors such as Peter Kostis. Effectiveness Golf instruction is no guarantee of success or improved play in the game. Bad mechanics can be deeply ingrained in a subject's swing, and psychological factors can also hinder progress. The 2009 Golf Channel program The Haney Project: Charles Barkley showcased some of these issues, as Hank Haney attempted to fix former NBA great Charles Barkley's infamously bad swing. See also World Golf Teachers Federation References