33 Faces

I've recently read on a interest concept.
ART GYM, mentioned by Mike Manley (in a great interview to Steve Rude) in Draw magazine #11.
It's like a routine, something you can do everyday to improve your skills, or before your fight with the white paper..(some kind of warming exercises)
I sometimes do something like that. Pick a newspaper or mag, look at your watch, and draw (in a crazy-speed way) all the faces you can find in the next 15 minutes.