The most common mistake that new endurance runners make is blowing themselves out early in the race. Without practice, it’s hard to know how hard is too hard. We’ve all gone through variations of this thinking: “It’s a race, right? So I should be in front, right? Okay!” Unless you’re superman, that thinking inevitably leads to that painful feeling near the end of the race that you’re dying and somehow can’t keep on going. For 100 milers, 24+hour events and other big endurance events, this thinking is what causes a good deal of Did Not Finish’es (DNF’s).