Rarely do I quote myself, but I found an old college paper on Richard Serra and William Kentridge, which was actually a paper about how much I love drawing:
His [Serra’s] relationship with drawing, essentially a flat piece of paper with a flat floating image, is an intimate one. He burns through drawing pads at a rapid speed. It is beneficial to him in two distinct ways. One being that it keeps him on track with his own work and with his everyday life. Here he maintains a rolling dialogue with drawing, calling it “diaristic,” like a drawn record of the day’s passing and the work’s progression. The second benefit is exercise. “The eye is a sort of muscle. And the more you drawn, the better shape that muscle is in, and the better you see.” Drawing is literally a physical activity that improves the funtion of your own body.