This is one of the simplest mind exercises ever. Take the newspaper, pick an article and start counting the number of word in the first paragraph of the article. Redo it once again to ensure the figure is correct. Go on to the next paragraph. In this fashion, cover the entire page. You can also use a book or magazine for this purpose. There is only thing that you should ensure; do not count with your fingers. The whole exercise should be done with the eyes alone.

Please refer to the book for more details on this activity.