I don't think JG is *evil* as some folks do, I just think that he's misleading people. He's talking about folks running 2:30 marathons and improving by walking. Gee, imagine what KK, Tergat, or Geb could do if they started walking! Why, sub 2:00's just around the corner! The icing on the cake is his claim that folks who don't go for the walking bit are just jealous because the run/walkers aren't out there puking or feeling bad. I defy anyone to tell me that they put their body on the edge for over two hours and they felt just great the whole time. Sorry, but pushing the envelope hurts. It's that simple. Having said that, I think it's perfectly OK for someone to run a marathon (or any race distance for that matter) at less than 10/10ths effort (so long as you're not part of a competitive team). That's a personal choice.
I think the real telling part of it all is his quote concerning how difficult his program can be: "These are largely people who had been very sedentary before getting involved in the program." Right. He's dealing with people that aren't UNDER trained, he's dealing with people that are UN trained. Walking makes perfect sense for them. I think, however, that it is foolish and short-sighted to put untrained people on a MARATHON program. If you're really interested in getting folks off the couch and helping them get into a healthy lifestyle, then get them motivated to run CONSISTENTLY first. The consistent application of a modest running program in these folks lives is what will make all the difference in the long term. Eventually, they can work up to the marathon distance, and do so in a safe and effective manner. These crash marathon programs remind me too much of the "check off the box" lifestyle: Went to Paris, check; Saw the great wall of China, check; Ran a marathon, check.... You know, we always hear about all of the people who "made it" through their marathon. I wonder how many of these folks stick with running over the years, how many folks suffered needless injury, and how many folks-in spite of their "success"- would've been better served and happier with a non-marathon run/walk program.
My final thought on this run/walk topic: At what point can you no longer say that you "ran" a marathon? Suppose I took a helicopter up to a 20,000 foot base camp on Everest, acclimated, and then did the final push to the summit over the course of several weeks. Is that sufficient to say "I climbed Everest" vs. starting at Katmandu? For that matter, what if I was dropped off at 25,000 feet or 27,000 feet? Certainly you could say that I stood on the top of Everest, but just as certainly the journey would've been altogether different.