So here is an interesting question, given all the stuff I've read recently - different takes on embrouchure etc. Is range and flexibility more a question of athleticism or technique. I suppose it's both in a way, but here is why I'm asking: Range - now I realize I am what about two months into a comeback, but range is an inconsistent thing, High C is there, then it's not . . . Then I accidentally reach beyond it . . . Playing Clarke's first lesson today there are a couple of high C's, and I couldn't get them. This after working on some long tones and slurs/trills (more on that later). So, I set the horn down and took a break, came back and played that part of the lesson - there was the C - though I could feel the chops not too happy about it. Now on the flexibilities/slurs/trills, I think I am seeing some improvement here - but it's spotty. Some of the intervals it seems like I can get a nice trill going (if I am not too fatigued), and others it's like the horn locks in a pitch and I have to wrench it back out - so I lose all sense of tempo. And, interestingly, why is it that coming down is more difficult than going up - it's that same trill, just in essence starting on the higher note rather than the lower note, but once we get to the lower note, it seems like it would reset and be just the same as a few measures before (if you are following what I mean). So what I am wondering is about the athleticism involved vs the technique. In other words, if I can play a High C at time - with authority at different dynamic ranges, and not at others, is it necessarily a question of muscle fatigue, or could it be mechanics (I realize this can't be diagnosed on the internet), for example I mentioned in a previous post about my first lesson, where my teacher kind of settled me down - made me relax and the C came out nice as you please. And related to this, it's my hypothesis that even though range would be built (if it's muscular) through increased muscle building, and flexibility through well, flexing the chops - and seem like different things are required to achieve both, that working in flexibility exercises will probably improve endurance and range as well. And a final note here on the flexibilities, it's funny that some of the intervals are harder say at quarter notes than say 8th or 16th, triplets, etc. I am guessing this is just that I am "locking in on the tone."