Middle octave C major
Start on hole 5 blow and move through the middle octave. Keep every note relaxed before you add speed.
Breath direction pattern
The basic pattern is blow, draw, blow, draw, blow, draw, draw, blow. The repeated draw before the final C is normal.
Metronome drill
Use 60 BPM. Play one note per click up, then one note per click down. When the motion is clean, repeat at 72 BPM and 84 BPM.