How to Actually Race an Olympic Triathlon: Pacing, Carb Loading, and Fueling
Olympic distance is roughly a two to four hour event. It doesn't need the aggressive three-day depletion-and-load protocol people use for marathons or Ironman. What it needs is arriving with topped-off glycogen and an empty, comfortable gut.
Carb loading: the 48-hour version
As training volume drops during taper, carbohydrate intake goes up. Not total calories necessarily, the carbohydrate share of them. You're burning less and storing more. Increase carbs while reducing fat and fiber so the total volume of food stays manageable.
Two days out: about 7 g of carbs per kg of bodyweight. Normal eating shifted toward carbs. Nothing dramatic. Cut fried food and heavy sauces. Training very light.
One day out: 8 to 10 g per kg. The main loading day. Carbs at every meal and snack, low fiber, low fat. White rice, white pasta, bagels, potatoes without skin, pancakes, Gatorade, juice, bananas, honey, jam.
The night before: large carb portion, modest protein, minimal fat and fiber. Eat early, by 6 or 7 PM. Familiar and boring. No new restaurants, no big salad, no celebration meal.
For a 75 kg athlete that's roughly 525 g two days out and 600 to 750 g the day before. Scale to your actual bodyweight.
The non-negotiables
Nothing new. Not one food, drink, gel, or supplement you haven't used in training. Race week is not the time to try the free sample from the expo.
Expect the scale to go up 1 to 2 kg. Every gram of stored glycogen binds about 3 g of water. That's the point, not a problem, know it in advance so it doesn't rattle you the night before.
Cut fiber hard. Skip salad, beans, broccoli, bran, skins. Fiber's job is to move things through your gut. That is precisely what you don't want at 7:30 AM.
Hydrate steadily, don't flood. Urine pale yellow. Clear means over-diluted. Two liters at 9 PM just buys you a broken night's sleep.
Add sodium the day before. It helps retain the fluid you're loading, and it matters more in summer heat.
Little and often. Five or six feedings hits the target without gut distress.
Pacing the swim
Warm up properly, banded activations (Rival Instagram shows a good warm-up), 200 to 400 m including a few short accelerations, so the first 200 m of the race isn't a shock. Then go out deliberately controlled. The most common Olympic-distance mistake is starting at 110%, spiking your heart rate, and spending the next 400 m recovering.
Settle at about 6 out of 10. Long, relaxed, rhythmic. The swim is roughly 12 to 15% of your day and 100% of your ability to ruin the bike. Nobody wins the race here. In the last 100 m, pick up your kick to redirect blood to the legs before you stand up.
Pacing the bike
For an Olympic, roughly 92% of FTP for about an hour is demanding but appropriate, for newer athletes you may want to shoot for about 85%. It should feel strong and controlled, not heroic. Structure it in three parts: ease into the opening 5 km while the legs are cold from the swim, hold the target through the main body, then back off very slightly in the last 5 km and raise cadence to prep for the run.
The real failure mode is surging. Chasing a wheel that passes, then coasting, then chasing again. That variability is what wrecks the 10 km. Some rules:
Judge by lap average power, not 3-second power. 3s power is noise. Don't chase every number.
Target a variability index under 1.05. If normalized power is meaningfully above average power, you surged too much, and you'll feel it at km 3 of the run.
Cadence 85 to 95 rpm. Grinding a big gear loads the quads and steals the run.
Pass decisively at about 110% of target for 10 to 15 seconds, then settle straight back. Don't ride 30 watts over for two minutes to make a point.
Pacing the run
Your legs will feel like concrete for the first five to eight minutes. That's normal and it passes, short quick strides, high cadence, and do not judge the day by how the first kilometre feels.
Then settle at about 8 out of 10 and hold it. That means comfortably hard: you can speak in short phrases but don't want to. Roughly threshold or just under. If you're gasping and can't get three words out early on, you're at 9 out of 10 and you'll pay for it later.
In heat, the same effort produces a slower pace, sometimes 10 to 20 sec/mile slower. That's expected and correct. RPE is the instruction; pace is an outcome. Chasing a training pace in race heat is how athletes blow up. In last years race my estimated pace was a 7:20/mile, however with the heat of the day (and over biking), I ended up holding a 7:39/mile average pace for the run. Adjust for what the day brings you.
Why the bike carries the whole nutrition plan
Target 60 to 90 g of carbohydrate per hour of racing, realistically if you can go higher on the bike… do it. You’re going to need those carbs on the run.
At steady power on the aerobars, your gut has blood flow and your body is stable, so absorption works. At 8 out of 10 on the run, blood is shunted away from the digestive tract and everything is bouncing. Anything you haven't absorbed by T2 is a liability, not a resource. Front-load the bike and treat run nutrition as a bonus.
Check whether your race has bottle exchange on the bike course. Plenty of Olympic courses don't, meaning everything you drink for 65+ minutes leaves transition with you.
Nutrition guidance here is general sports-nutrition practice for a trained athlete, not individual medical or dietetic advice. If you have a medical condition or specific dietary needs, speak to your physician or a registered dietitian.
Want this handled properly?
I build race-specific plans like this for the athletes I coach. Course breakdown, power and RPE targets off your actual FTP, and a fueling plan in grams. If you've got a race on the calendar, let's talk.
Dr. Mike Blanco, PT, DPT, Cert. DN — USAT Level 1 Certified Coach. Rival Physical Therapy, 681 Lawlins Road, Unit 110, Wyckoff, NJ. Call or text 201-220-9049.
This article is general education, not a diagnosis or individual medical advice. If pain is severe, worsening, or present at rest, get assessed in person.
Comments