OK, here's a second video and the results of the exercise. I decided to try brown and white colored pencil on brown paper (read cut-up TJoes bags) and to create a video with 30 second poses of dogs in motion. Dogs have great lines and volumes, but I don't know, when I'm drawing, how the legs work.

If you have never tried drawing with white and black media on a colored paper, I would recommend it. It is a nice way to get a feeling of volume.

Let's be clear - I don't think these are great drawings, that's not why I'm posting them. I want to encourage people to post theirs, because I think you can learn things about drawing that are difficult to verbalize by looking at the results of this kind of exercise. It can help to be less self conscious and less precious about drawing, too.