Has anyone tried any of the new types of shoes designed to feel like you bare feet? Supposedly, there have been studies release saying the way we are walking heel to toe is the reason people have problems with knees, backs, etc. I have read a couple of good articles. There seems to be a few companies who have designed some interesting stuff, Vibram five fingers has some outdoors styles. Just wondering if anyone has any experience. We did walk barefoot for thousands of years before we had cross traininers.