@sweber_de For this study, I use https://quickposes.com/en ( the sitting collection) I skip the one I don't want, and 'open in a new tab' the picture I want to study, so I don't have to deal with the clock.

I change the proportion, I make my drawing a bit more athletic. An exaggeration just to train muscle groups.

> can you do it just by imagination?

Yes, I can but with more errors or area sometime I don't really know how to solve it precisely. Having a ref' helps me to spot these issues.

@kranzkrone I can't talk for all fictional characters or authors, of course, but for my study here, I use exaggerated athletic dry muscle for drawing muscle groups and shapes. A bit like an écorché study.

Showing this anatomy should result in a dynamic set of lines (usually, because in my studies, I still have a lot of stiffness).

Being able to play with a mass of fat in the body, their locations, and the way they behave, is another level skill, difficult. I hope I can reach it one day.