Hello all, I am a sophmore in college, taking private lessons currently. My teacher and I have started to see an increase in tension especially in the neck muscles, and then eventually in my emborchure, specifically my corners. It feels as if the corners tighten and tighten, until my lips do not vibrate at all. Also, my teacher thought he saw my bottom lip tuck under. My lips eventually give out, needing a few seconds to relieve. As i play again, my endurance is shorter. As I go up the scale, it is noticable that the neck muscles are tightening. especially starting above the staff. I believe it's me compensating for my lack of efficiency using my air. I have no remedy. My endurace is short and wish to relieve the tension as much as I can. Thank you for any help.