It is all about the air flow. Charlie Schlueter said "more air equals less work". Also imperative is keeping any tension out of the body when playing. Tension gets into the breath and results in improper breathing. When one doesn't breathe properly, one uses pressure to get the results. Down goes endurance. One also needs a clear idea on what sound he/she wants to get. Without that idea you end up with nothing. I suggest anyone interested in getting a better understanding of air flow and air velocity pick up a copy of Luis Loubriel's book "Back to Basics for Trumpeters. The Teaching of Vincent Cichowicz". It is not a "how to" book. It is regarding the thought process of one of a great player and pedagogue and how he came to his theories. Chicowicz kept it as simple as possible. Chicowicz's students hold many of the top seats in major orchestras and they continue teaching the Chicowicz method. You might also find a copy of the Chicowicz air flow studies. The studies are designed for a smooth and continous air flow. Some get quite difficult technique wise, but those not only work the fingers but teach phrasing and playing musically. We are not designing a faster than light engine for space exploration. Playing the trumpet does not that kind of deep thought process. There is so much BS given out on the various websites it easily confuses those who don't understand it takes intelligent work and practice to become a good player. Rich T.