Hello. I am 18 and have been playing trumpet for four years under guidance of a very good teacher. I forgot to ask him this question: there are some exercises in Arban's Method which are really long such as no. 17 to no. 21 in slur section and I'm not sure if you are supposed to play it in one breath or not. I cannot right now, but should you be able to if you are very efficient with your air?