We may be comparing apples and oranges here. The practice of "prayer walking," as I understand it, is going on-location to walk in or around an area and pray for it, often aiming at particular targets in that geographical locale. What I wrote about is merely walking while I'm having my daily or a special prayer time. The former is always about a specific situation or location, while the latter relates to one's "general" prayer life. The former is deliberately done at a specific location, while the latter is done wherever one happens to be—at home, at work, while traveling, on vacation, etc. The former is a one-time event or temporary practice, while the latter is an ongoing practice.