“Working Zone” is the area where you make personal progress. In “Working Zone” the things you practice are not too difficult or too easy, but they are challenging enough. Regular, dedicated and focused practicing in the “Working Zone” will improve your playing skills. Find your “Working Zone” daily. Work there slowly and systematically. Be patient. Focus on practicing the things you really need to. Try always to be aware why you are doing what you are doing. In this publication, the authors wanted to gather, combine and clearly explain, what in their opinion are the most important things to practice. The book is written with tuba in mind, but the exercises are universal: any low brass instrument, any bass clef instrument is applicable.