If you want to learn the complex, down to the bare bone science of how the human physiology reacts to exercise and nutrition. This book is excellent at explaining the biochemistry of exercise science. If you want to read some elementary fitness then this book is not for you, if you want to learn the true science and really challenge you mind and really learn how the body physiology, anatomy, nutrition and exercise biochemistry work so you can completely floor your friends when you speak at the gym of what you learned, then buy this book. :)