This book of exercises developed out of many years of pedagogic experience working towards the "conscious" stimulation and execution of the warm-up phase of flute playing. In other words, warming-up means the preparation of the body, limbs and organs and many other biological functions. One of which, breathing, for example, supersedes its physical function to allow the creation of tone and song.
Difficulty level, roughly compared to ABRSM exam grades. 0 is beginner, 9 is advanced (beyond grade 8).