Exercise to music classes, whether in the form of aerobics, keep-fit, stretch or conditioning, are still an extremely popular way for women and men to obtain general all round fitness. This updated and revised edition shows readers how to recognize and choose a qualified and competent teacher, understand the correct use of rhythm and music, know how to exercise safely, assess your fitness level and monitor your progress. The section on anatomy provides a basic understanding of the components of physical fitness and shows, with diagrams, how the heart and lungs respond during exercise and how the muscles and joints work.