Learning to draw is really a matter of learning to see. Kimon Nicolaides
Gesture drawing is a great way to warm up for a drawing session. It involves a loose kind of scribbling. But it is much more than that. For many artists gesture is at the core of their work. For some designers it is how they generate ideas. See the gesture drawings of world renowned architect, Frank Ghery.
For students, gesture drawing can seem like pointless scribbling but it is crucial to the way we see and draw.