Ironman Racing - Your First Race
My buddy, Ian Brownlee, was kind enough to add some MOP thoughts. These are in italics. The normal print is my own ideas.
These thoughts are intended to help first timers with their pacing over the distance. I wrote the original article close to ten years ago. I updated it a bit but left the structure the same as it reflects how my first year of IM racing went.
Every one is different and somebody else's plan may not work for you. My comments are for those who just want to finish.
 Increase the salt in your diet for the two days in advance of the race. Soup is great.
 Drink a diluted bike bottle of sport drink five to fifteen minutes before the swim start. I assume that you don't get seasick. If there is a chance that you will get sick then I would be cautious on this one. Make sure that your drink concentration is a correct. Better to err on the side of weakness.
The start can be crazy with so many people so close. IMAus they have a grading system based on speed with slowest at the back and it works. IMNZ was all mixed up, and after 300 meters I had blown up, heart rate over the top and gasping for breath thinking my whole day was gone in the first five minutes. Backstroke for a while, controlled freestyle away from aggressive swimmers and then concentrating on picking up a good draft of someone faster helps. I got a good draft for about 3ks and was five minutes faster than expected. Take it real easy and enjoy floating in the wetsuit as it's the best part of the day.
 In a hot race, I will drink a fair amount of fluids (about 1.5 bottles per aid station). I was very well hydrated and therefore didn't need the water. I used one Succeed! Electrolyte cap every hour for the whole race. On the bike, water only went on my head and clothes. In a hot race, it is important to keep your clothing wet on the bike to stay cool. On the run, I tried to get one glass of Gatorade and one glass of water at every aid station. Early in the marathon, slow to let your system absorb fluids and take on calories -- it only gets tougher as you progress! If I am feeling bloated and peeing then I reduce my hydration. If I am feeling bloated and not peeing then I slow down.
 Your food/fluid needs may vary but it is probably best to err (slightly) on the side of too many calories early in the bike. It is normal for your appetite weakened during the day. I have modifed some of my thoughts on nutrition. See Ironman Race Nutrition.
6.15 to 6.30 on the bike is a long day, especially if it is raining and cold. Take more clothes than you think you need if it looks like rain. In NZ I didn't and was really cold for the last hour. In Aussie I wore every thing I had -two tops, arm warmers, gloves, leggings, sox - and never sweated. If its hot wear sun screen and UV protective clothing in NZ/AUS as the sun is so fierce. There was a hailstorm in NZ in 1998.
Don't over do the bike. If you don't rely on a heart-rate monitor (I never get into zone) then trust your legs. Least effort cycling sees you use all the gears up the hills and ride the flat at one gear easier than you need. Don't actually feel that you are pushing the bike. Down hill coast and stretch if your speed is around 40kph.
Drink and eat constantly, stop and pee at least twice. Ian has had trouble with gels as your stomach may say enough like mine did and you will throw up all around the run. Take something you like such as soft buns, bagels, donuts. Wiktor saw a guy with a Big Mac in his special needs bag. Your stomach will love some real food in the last three hours.
In the last 10km of the bike, Ian eats and drinks very little as his stomach is better without it when the run starts. First time in Australia, I had gels and drink before the end of the bike and threw it all up within 2km.
 Obey your HRM, don't hammer. The race will feel very easy for the first 3-4 hours. Don't be fooled. It will get tough later. By conserving on the bike, you will put yourself in a position to run-the-run. The mental benefit of passing people on the run far outweighs the 10-15 minutes that you will save by pushing on the bike.
 Obey your HRM, don't slack. About four hours into the bike on both races I started to feel very tired. Use your HR to tell you to push it up a bit. No need to crank but be sure that you are close to your target HR. It is a race after all, and you don't want to spend any time at the bottom of your aerobic zone.
Not true! I agree with being tired at 4-5 hours, but I relax for a while, eat a bit, drink a bit, stop, pee and stretch. Stuff the HR zone as I probably haven't got into it anyway, do what your legs tell you and don't pretend that you haven't got the marathon to go.
 If you do not pee by the three hour mark of the race then slow down and focus only on hydration. That strategy salvaged my IMC. Even with this plan, I didn't pee until T2. If it had been a hot day then I would have been toast!
The rest of the day was easy! My first and last hours are usually great - it's the bit in the middle when trouble happens. Take your own drink mixed to your strength if there is any doubt about whether you can handle the supplied drink. I seem to need two toilet stops, and by then my stomach is not working right anyway, so they are a challenge in themselves. Eat real food - biscuits, bananas, bars but don't eat acidic oranges and don't rely on gels alone.
Run it in 2km pieces if it gets hard, with the next aid station being the objective and walk through it eating and drinking. Drink Coke in the last 20k as the sugar really helps.
Wear clothing that will see you through the heat of the late afternoon and keep you warm in the evening. I took my own drink in a Camelback last year as I couldn't drink Maxim, plus a light jacket, and used them. Cold is a problem in Australia and New Zealand.
John Brewer on the run, "The fact is that your first IM isn't a race - it's a test of how much patience you're prepared to exercise so that you don't expire or explode before the second half of the marathon - which is where the real ironman just begins. After pacing yourself on the bike, divide the marathon into 26 separate carefully-paced jogs from one mile marker to the next. Getting from the 16th to the 19th will be tough but after that point you'll be cruising."
Sometime you will feel terrible, even on a good day something goes wrong. Even if the last race was good, the next one could be really bad. Start with a series of objectives in mind and if one is not achievable drop down to the next. But don't worry as the ultimate objective is to finish, and you have heaps of time. Even if you throw up during the marathon as I did, and think you have to drop out, don't. Just sit down for half an hour, eat real food and drink electrolyte and coke until you feel better.
Just keep moving. There is enough time to finish by walking the marathon - but that's not really a race is it?
 As Dave Scott says, "Pain is temporary, Pride is forever."