Done as part of a practice session with poses of 5 minutes in length.
My current goal is: Better understand human anatomy, so I can render imagined poses
I'd suggest learning about the structure of the head first and doing some specfic untimed studies on the planes of the face as this'll help you level up your 5 minute studies way more.
https://www.artstation.com/artwork/GX3Ax1 <-- this is an excellent tool to not only study the places of the face but also the lighting and shadow of each plane depending on where the light is coming from.
once you get the planes memorised, you'll be able to spend not even 30 seconds sketching out the structure then can go in with the details of the model.
I'd suggest learning about the structure of the head first and doing some specfic untimed studies on the planes of the face as this'll help you level up your 5 minute studies way more.
https://www.artstation.com/artwork/GX3Ax1 <-- this is an excellent tool to not only study the places of the face but also the lighting and shadow of each plane depending on where the light is coming from.
once you get the planes memorised, you'll be able to spend not even 30 seconds sketching out the structure then can go in with the details of the model.
good luck :D