Singing is a kind of sport and a singer a kind of athlete and following this model becoming "vocally fit" - building vocal muscles - should be the point of any form of voice teaching. Other approaches don't work directly on building vocal muscles but instead focus on so-called diaphragm support and breathing, mask singing, breath control, throat relaxation - all of which are useless at best and harmful at worst.
Gary CatonaAll singers, no matter how gifted, should always try to go improve. And all students begin in the same place despite the level of their talent. It's like bodybuilding: All people who train use similar exercises no matter how naturally physically endowed a person may be. I have worked with many of the most brilliant singers in modern music and it's always the case that they have a great deal of under-realized potential no matter how amazing their abilities.
Gary Catona