One of the big changes for the 2010 Ironman season is that there are no more official open water sponsored swims in the mornings before the race. Triathletes will be on their own to get in some swimming before the race. On one hand, the swim is really the least important part of your day. It’s really the price of admission to the rest of the race: it’s the shortest leg time-wise, it’s the shortest leg distance-wise. But all that said, if you measure the stress levels associated with the different legs of an Ironman Triathlon, the swim would probably rank the highest.