Anyone Who can say that this book was not good is a douche bag. This book was awesome! Anyone who says otherwise Are themselves being judge-mental. The author did say that some people might not fit exactly into one category, therefore may possess one traits from one of the other body types, and another trait from a different body type.
Peoples natures are determined from a very young age, and it is at this time when the dominant trait is visible. Some people are more genetically inclined to be fatter than some, and some people are genetically inclined to be muscular, it is through life that's these dispositions can be altered by the individual. Although they may be able to alter themselves somewhat, they remain true to their true nature. So anyone who has negative comments about this book is clearly illiterate.