If you follow the links the book the pictures are from is called "Bodies Are Cool" and it features a lot of body shapes and sizes, only a very few normal weight (most still high body fat percentage though), even less under weight and from the many images on their website exactly 0 muscular bodies are shown, not even a strong woman.
https://www.kinderinwien.at/en/about-us/kiwi-organisational-structure/cpo/cfo