I've been leading a second Gesture Drawing Class supplementary to Alex's. I'm not as experienced as Alex or Louis or Tom Gately but it's a beginners class and allows me to draw with folk from other departments and learn with them.
There's nothing like teaching to force one to distill and condense drawing principals & technique.
These are some of the notes I made in class-basic tips and tricks to strengthen drawings.
And some fun stuff from the sessions . . .