It might be -- What Are The Fundamentals? Draftsmen S1E04 --Stan mentions Glenn Vilppu´s Drawing Manual. Maybe that´s the one? Or maybe Andrew Loomis´s Figure drawing for all it´s worth. I´m not a master, but maybe this answers your question about the process: I start with gesture, trying to feel the pose, the energy and the effort the figure has to make. BUT, I am feeling it, drawing it, in space. I am not really constructing but I am aware that the gesture lines belongs to 3d forms. I am aware that what I draw takes place in space.  When working from reference it´s easier to make proportional corrections when you only have a few gesture lines. And when working from imagination this is a great way to establish a natural pose. And to make it more 3D, yet still being at a very gestural stage I like to start sculpting the volumes. Wrapping energy lines around them, trying to feel the mass. This might be enough for a quicksketch. But if it´s tricky perspective I then redraw it, now starting with boxes to figure out perspecitve. This order is not set in stone. Sometimes starting with a boxy robo bean is the best way, or a cylinder for the leg. Though, even if I´m drawing structural forms i try to make them gestural, either by bending them to follow the gesture or just be aware that there is a rythm between the boxes. I recommend watching Mike mattesi´s 3 part series https://prokolab.com/lesson/improving-line-quality-and-rhythm-force-series-part-1/discussions And this Glenn Vilppu video might help too https://www.youtube.com/watch?v=pa_2rL1K1mg Hope this helps!