I love this so much! I'd suggest if you can't take a walk (say in winter) walk around your house with your ear buds in, and pace. The music will help stimulate your walking pace and increase blood flow to your brain to keep you thinking! I do this all the time and it helps! ☺
George Lucas based Star Wars on Joseph Campbell's comparative work on the parallels among the heroes/mystics/teachers/founders of the major world religions and world mythologies. This is a diagram of those parallels as presented in his book "The Hero with a Thousand Faces." A more readable version can be found in Christopher Vogler's "The Writer's Journey" -- a text for screenwriters.