The physical fitness committee of the professional schools of the University of Illinois tested all the first year students over a period of three years with a battery of tests. The project was cooperative and utilized many of the different departments in the university. The authors begin by defining physical fitness, as distinct from emotional, mental and social fitness. They consider the development of the various tests used, the classification of body types, the relation of weight to physical fitness and the significance of tests of the heart rate, theblood pressure and the basal metabolic rate. They then discuss strength, motor fitness and athletic performance. The book is thus a guide to the appraisal of physical fitness, and a record of research such as has not been heretofore available.