Hey, I have pretty much lost my chops due to not playing for about two months (i know, dumb move) and am now a couple weeks away from starting college. I'm pretty certain that my face will not last through the three hour practise sessions, or the two hour class. I used to have a pretty good amount of endurance while playing; i could still shriek out a high C after a couple hours (with breaks), but couldn't even think of going any higher. Are there any excercises that could help me build up my chops again and prevent them from tiring so quickly before school starts? I'm starting to feel a bit desperate. Thanks! **Clarification** My regular range is from a low F to a high Eb. The only time my upper register fails is when my lips are exhausted, or in this case out of shape. Also, I am by no means a pro. The only education i have had in music was highschool band classes.