From Gottfried Bammes book “Der Nackte Mensch”.

Gosh this is going to be a very useful reference for me in the future. I always tend to mess up poses like these ones.

And to be honest, it feels like there’s way too little references over the flexibility of the spine… And I think some *cough* comic artists *cough* should consider this before they break the spine on the superheroines in their comics, stylization is one thing - using exaggerated pin-up poses on every drawing is another.