Exercise: Breathe in and breathe out

Sit down comfortably.
Or lie down.
Breathe in through your nose.
As you breathe in, think: “breathe in.”
Breathe out through your mouth.
As you breathe out, think: “breathe out.”
Many thoughts are sure to arise as you do that.
Just let the thoughts move on.
Thoughts come and go.
Keep thinking about your breathing.
Do the exercise
until you calm down.