Some time ago I mentioned I was revising and improving this guide for publication: here's the improved version! As you can see I've added a few points such as breasts and balance, and more details concerning the foreshortening of the face and men-women differences. I've similarly added to other parts of the book (the catalog of human features, etc) but I'm not going to post everything, gotta leave some for the published version!

You'll have noticed hands are no longer included here – that's because they have their own tutorial here: [link]
As for feet, don't panic, I'm currently making a better tut for them
All my tutorials are listed here: [link]

Note that the tutorial book is not updated with this new version yet. I will do so when I can, but if you want to make a purchase soon please contact me so I do it sooner.

Some advice to use this tutorial:

Use the above guide as a supplement to gesture drawing. Reading and memorizing all this won't help you as much as sketching from life; this guide simply provides the understanding that will make your sketching a learning experience rather than a random process. So, carry a sketchbook around and gesture-draw people around you, especially people in motion. This way you are forced to use fast gesture drawing and not go obsessive over the details, and that is how you can achieve a solid grounding in grasping form and movement before moving on to worrying about surface additions such as clothing and expression. Think of the human body as an assortment of volumes, not as lines put together. This will change your life, trust me.

See also this article: [link]

Now about the tutorial itself. It is large, so if you find it intimidating do start with my much smaller guide right here: [link]

Bibliography:
Drawing the Head and Figure, Jack Hamm
Le dessin anatomique facile, Burne Hogarth
Experience and (believe it or not) martial arts