I'm practicing the song below:
But when I reach the middle of the 6th bar, there's almost no air remaining in my lungs (right after E-C). The problem is that I need to breathe, say, inhale, somewhere at the end of the 5th bar, but the successive G-A-G-F quarter notes don't let me do that since any breathing interrupts the correct tempo of my performance (maybe it's possible and it's just my weakness!).
Is there any rule-of-thumb to determine the spots of a melody at which a performer needs to breathe without interrupting the temporal flow of the melody?