Hello I am a student in Canada and I seem to be running into an issue of having to play lengthy, fast passages with no rest and I have no idea where to breathe.

An example of a piece I am working on right now would be the melody shop march solo from 78-end.
it's not necessarily the notes that are messing me up as I can practice it slowly and build up muscle memory for the passage but as I am playing it faster now I find it impossible to find a place to breathe quickly enough to continue back into the passage in time.

is there any advice?

also my idea of playing it "fast" is 100bpm

kyle