I’m a Walker and DFW is one of the best domestic airports for walking. I’ve had two hour plus layovers where I can easily get a five mile walk in simply going from A to B to C To D. It’s really easy to walk the airport (except to E) and I rarely use the sky train unless I’m super jammed for time, or E.
I think you also acknowledged the obvious in your last post. It’s going to be close to 100 for the summer almost daily. Sometimes we’ll above. Maybe you like running in oppressive heat? I don’t even like driving n it.