The physiotherapist is responsible for analyzing the postural issues of the lyrical singer, as well as pains, tensions, structural asymmetries and any deleterious effect that affects the body systems due to his professional activity as a voice athlete. Unfortunately, research dedicated to this particular group of artists and their specificities from a physiotherapeutic point of view is practically non-existent. This book was written with the purpose of filling this gap, addressing the causes, consequences and possible approaches to treatment and prevention of diaphragmatic hypertonicity in lyric singers, and paving the way for the production of more academic works on the activity of professional lyric singers.