Jeff: In every area of life there are individuals who will tell you that the only way to do something is the way that they do it. According to an original source, all of the marathoners in the first marathon race in Athens (1896 Olympics) walked significant portions of the race. By nature, running is a self empowering activity and each of us can choose how fast, how far and how many walk breaks we use on each run. If anyone says that run/walk/run is not doing it right, ask for the rule book that excludes walk breaks. They cannot, because each of us makes our own rule book.