This podcast will train you to dramatically increase your visualization skills in exactly the time it takes to listen to it. About 17 minutes.
It’s based off this ancient article from 1994 written by some fossil named Wynne, another curmudgeon/fossil (and brilliant trainer and training commentator for over twenty years) named Ralph Mroz discovered it in his archives and was kind enough to share it as a PDF here:
Go here to listen — do the exercises along with listening and improve. Or not. Up to you.