I'm just wondering if they're any good exercises to increase endurance. It just seems that I have a very hard time getting through long passages (even if the notes are not that high). I don't know if it's me, or my instrument, but there are times when I wonder if trumpet is right for me. I know practicing a lot can help but that doesn't work. I can't practice for 1 hour continuously. Does anybody have any advice for me? Thank you.