I'm about halfway through my marathon training and it is AMAZING how my level of endurance has grown. Just this week when I was running I thought about the longest I had ever run prior to the start of training was 6 miles - Saturday I will run 14 miles. What is even more AMAZING is that it doesn't seem that long. It is only 2 more miles than the 12 I've already run a couple of times. It is AMAZING what one can do if they just try.