Thanks again for the comments and suggestions Phil, SevenShips, B&A, Lawrence, and everyone else, whether directed towards me, others, or put out there as general info. I don't know if I always agree with the single-variable approach, but in this case, yes, as I've said above, I'm going to start with the knee drive, and then possibly look into the idea of extension. When I look at Lawrence and B&A run, they look pretty similar to Dr. Mark (although the Pose technique does seem to differ with respect to the 'lean'), and I'm with BarefootGburg on the idea of using mental imagery as inspiration and guide. That semi-mindless approach can work too I think. It'll be fun to have 7ships have a look in a few weeks too. And maybe when I start to up the speed a bit I'll set up a video cam and do a little gait analysis on my own. Maybe even post it for feedback. Anyway, it's been a great discussion. I've come around to the idea that thinking about technique is a good idea, but also aware of the fact that I may already be doing things just fine by feel. To paraphrase a certain barefoot (or was it minimalist?) Greek, "an unexamined gait is not worth running."