Few weeks back I've started male anatomical study to get better knowledge of all muscles in body. I am switching between different personal projects :), so posting it now in wip state. As a main reference and learning resource I am using book by Gottfried Bammes - https://www.amazon.com/Complete-Guide-Anatomy-Artists-Illustrators/dp/1782213589 really awesome book that my friend Rodolfo Fanti recommended me. I am also using as reference models done by other artists and image references found on internet.