quick drawing

During a practical session in class we were set a task to do quick drawing studies of people going about their daily life these drawings consisted of only a couple of seconds to get an overall idea of human shape and form and also to try and capture their expressions. I found this task really difficult because its vastly different from life drawing as the models would be constantly moving and to capture motion of people walking or staying in one pose for a couple of seconds was difficult to grasp and is an area that I

can greatly improve on.