Welby Tennis is a method of teaching tennis to beginner- advanced players. It is based on the teachings of a man named Welby Van Horn who produced many fantastic players including Charlie Pasarelle who was once #1.
To see the teachings of Welby Van Horn thre is a book. It is called "The Secret of a True Master". The book discusses the Welby Tennis methods and well describes how to improve the game of a player you are teaching. Visit the website at welbytennis.com