Sorry, I spole only in japanese. I write here what I told.

1. Breath:
1.1 Preparation:
1) Inhale with nose, exhale with nose
2) Inhale with nose, exhale with mouth
3) Inhale with mouth, exhale with mouth

1.2 Exhale with metronome paying attention how to take a breath
1 beat=60, 5 beats 4 sets
1 beat=80, 10 beats 4 sets
1 beat=100, 10 beats 6 sets
1 beat=120, 10 beats 6 sets

1.3 Exhale as long as possible

Attention!
Try not to disturb your air streaming in your exhale. Position of toungue, lower jaw, teeth(not close) might disturb.

For inhale try to put air to your both chest and abdomen. If you inhale only one part, it wil make problem for playing. Use "Ha" for chest and "Ho" for abdomen. Depends on your mother tongue these pronounce can be changed.


Last equipment is for medical use. But I sometime use for students to show how they don't take a breath enough. You can find here for ex.

https://www.amazon.de/HEALERS-Tiefena...

All the best, Yuki