This is a short explanation of correct embouchure movement as defined in Jerome Callet’s 1987 book and video Superchops. It describes how the lips should move when you play the trumpet. The purpose of this is to build up the embouchure’s ability to correctly resist the air stream. That way you can use your body strength to compress air. Without resistance to the air stream it does not matter how hard you blow or how much air you use, you will not be able to develop a strong high register or quality trumpet sound.
These ideas are considered a little old-fashioned by some. For more up-to-date information take a look at the TCE-UK website. Learning correct movement of the lips is addressed in both of my ebooks Exploring The Double Pedal Register and The Seven Bugles. I use both of these books with all of my pupils.
If you have any questions then please do not hesitate to get in touch.