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.
If you have any questions then please do not hesitate to get in touch.