" Focus is not achieved by staring hard at something. It is not trying to force focus, nor does it mean thinking hard about something. Natural focus occurs when the mind is interested. When this occurs, the mind is drawn irresistibly toward the object (or subject) of interest. It is effortless and relaxed, not tense and overly controlled. "

― W. Timothy Gallwey , The Inner Game of Tennis: The Classic Guide to the Mental Side of Peak Performance