Having dislocated both my knees over the years, plus other injuries, I had been told running was not a good idea but I didn't want to admit defeat..! Having read "born to run" I thought a complete re-think of my running technique was a do-or-die solution; and it worked!! I completed my 1st triathlon 1 month after I started using the Vibrams with a personal best in the run!! The REALLY important thing to remember is that your feet are not used to having to work this hard so, no matter how fit you are, you have to begin with short distances - just 1 mile or so. Or you will risk stress fractures & your calves will really struggle. The correct technique is also vital; if you heel strike you will damage yourself so read into it & look on youtube etc... This is like learning a new sport!! A personal trainer friend was very sceptical but she is a complete convert now and wears them EVERYWHERE! I'm never looking back. Some people already have a great running style, even in trainers, but if you struggle or hurt when you run this could be the answer you're looking for - running is FUN again!!