In the last 10 years, the use of clinical exercise testing in respiratory medicine has grown significantly and, if used in the appropriate context, it has been demonstrated to provide clinically useful and relevant information. However, as its implementation and interpretation can be complicated, it should be used alongside previous medical evaluation (including medical history, physical examination and other appropriate complementary tests) and should be interpreted with the results of these additional tests in mind. This timely ERS Monograph aims to provide a comprehensive update on the contemporary uses of exercise testing to answer clinically relevant questions in respiratory medicine. The book covers: equipment and measurements; exercise testing in adults and children; cardiac diseases; interstitial lung disease; pulmonary vascular disease; chronic obstructive pulmonary disease; pre-surgical testing; and much more.