I am currently undertaking a gym instructor/circuit/personal training course and required the underpinning anatomy and physiology knowledge. I found this book invaluable - brilliant, easy to understand, concise, humerous - it covers the following: Concepts of fitness, The skeleton, The muscular system, Kinesiology, The cardiorespiratory system, Energy systems, Nutrition, Health Screening, Workout structure, Gym instruction, Circuit training, Exercise to music,Step aerobics, Aqua aerobics, Teaching and instruction, Health and Safety, Customer Service, Promoting Physical activity. I call this 'my bible' - I always carry it with me. If i have any criticisms about the book it would be that the circuit training section could have gone into more detail - but other than that - thank you to the authors. It should definitely be recommended as a core text for the OCR/NVQ exams.