It is a comforting moment when we suddenly realize that our commitment to race, to participate in something so important to us-our dream-will be actualized. We have made it to the starting line. In this moment, the probability that we will do the event reaches 100 percent. The hundreds of things that can go wrong leading up to an Ironman have been cleverly averted, and the thousands of things required to get to the start are all now officially history.