So, I woke up the other day and began my regular warm-up routine. I start with long tones and then go on to major scales starting on a single octave low Bb and ending on a with double octave D (one above high C). I then go on to other things but that's irrelevant right now. Anyway while I was doing this, I got to about an A below high C, and it was really pinched and ugly, and then all of a sudden I couldn't even hit it. So I went about and I played all day, and then after a playing in community band later that night, my face and aperture just felt incredible; you know that feeling when it feels like you could play anything at that point? So to see how my face would react, I started on a High C and played to the F above it. And it was a really clear and beautiful sounding note! My question is, how do I get to the point were I feel that good all the time, from when I pull out my horn to warm-up to the end of the day?