First, rundown is a series of steps or procedures that all lead to a goal that is defined. I don't have exact data about Introspection Rundown, so I am not going to talk rubbish like Dr. Bob who answered the same question somewhere else till I get them. All I can is to explain what a rundown is - for now. A series of steps and/or procedures that are done as a program to achieve something. There are many rundowns in Scientology and one of them is Purification Rundown the purpose of which is detoxication of your body. The different steps you do are: taking exact amounts of vitamins, minerals, lecithin, cold pressed oil, raw vegetables, running and sauna. There is much more details but - briefly - this is Purification Rundown - program the purpose of which is to detox your body which affects positively your thinking as well. You do different detox methods in Yoga too.
Well, Dr. Bob says complete nonsense - from the first letter to the last - pure rubbish and I don‘t want to go over all the nonsense he says but let me just mention one fraction of Hubbard’s career and success as sci-fi writer (he wrote also many other genres but these are not mentioned at all by people who want you to believe he was ONLY sci-fi writer who made everything up; why to bother to mention westerns, thrillers, adventures etc.).
“The internationally bestselling Battlefield Earth: A Saga of the Year 3000, for example, not only stands as the largest single volume of science fiction to date, but among the most honored. In addition to both the Academy of Science Fiction, Fantasy and Horror Films’ Golden Scroll and Saturn Awards, the work has earned Italy’s Tetradramma D’Oro Award (in recognition of the story’s inherent message of peace) and a special Gutenberg Award as an exceptional contribution to the genre. Similarly honored was the ten-volume Mission Earth series, each topping international bestseller lists in what amounted to a publishing phenomenon and cumulatively earning both the Cosmos 2000 Award from French readers and Italy’s Nova Science Fiction Award. Then again, one could cite all L. Ron Hubbard represents as the model author in many a university – very much including the L. Ron Hubbard wing of Moscow University’s Gorky Library – and all else he represents to modern fiction as a whole: “...one of the most prolific and influential writers of the twentieth century,” to quote critic and educator Stephen V. Whaley.”