Select an exercise pattern to suit your life style. All f us have different life styles and professions so there is no sense in trying to follow the book strictly. Try and follow an exercise routine that is suitable for you. You have to understand that even more important than the exercise itself is sticking to it. So unless you choose something that can suit your life style, you are not going to stick on to it.
Don’t stand, walk. If you can walk about then do so. Do not stand in a fixed position. Pacing about is a good thing to do. If you are thinking deeply about something, try pacing about, it will aid in your thinking.