The document discusses Nideffer's theory of four attentional styles based on the dimensions of width (broad or narrow) and direction (internal or external). It provides examples of each attentional style, such as a squash player using narrow-external focus, and a footballer using broad-external focus. When the environment changes, an individual may need to shift between styles, such as using narrow-internal focus for mental rehearsal of a football corner, then narrow-external focus for the execution. Sprinters in a video are using narrow-external focus to maximize their performance.