School let out about 2 weeks ago, and in those 2 weeks, I've practiced a few days. Well, I took a break the second week, I hardly played if I played at all. So, today I take out my horn to practice a little. I played things with a few notes above the staff, and I realized something. I can barely hit a high G anymore, that is, without it cracking. My lips have weakened. Last year, this thing didn't happen. I did have a problem of feeling my lip out of place, but that's not important at the moment. Can anyone give me some exercises that can strengthen my lips to the way they were before? Band camp is in a month, I think, so I'd have to work pretty hard to reach my goal. Also, I'm most likely going to play first chair, so improving my lips and range would help me so much.