IRONMAN 70.3 Les Sables d'Olonne
Sunday, 5 July 2026
IRONMAN 70.3 Les Sables d’Olonne is a 1.9 km freshwater swim followed by a rolling 93 km bike and a flat/fast 21.1 km run—your success will come from steady fueling through the bike and disciplined pacing into a windy, moderate-heat day.
- 👍 Conditions are kind — the 650 ml/h fluid, 750 mg/h sodium and 90 g/h carbs baseline should hold. Fine-tune to your own thirst and sweat rate.
Typical 10-year conditions, not a forecast. The official wetsuit ruling is set on race morning — check the IRONMAN race guide →
Worlds qualification — slots TBAsee who qualified →Arrive seeded and ready to move quickly at the start. Spend the warm-up getting your shoulders and hips loose and practicing a few controlled accelerations so you can lock into rhythm fast. In the first minutes, find clean water early (don’t fight the front wave if it’s congested) and aim for smooth, repeatable strokes rather than sprinting for position.
You’ll swim 1903 m in freshwater where the temperature varies, so treat the first 5–10 minutes as adjustment time—focus on breathing calm and consistent while you settle into your pace. The biggest day-to-day variable is how the water feels: if it’s cooler, go slightly easier initially to avoid oxygen debt and early arm fatigue. If there’s any chop or current (common with coastal locations), keep your sighting frequent and let your pace be driven by effort, not perfect speed. Fuel isn’t a priority in the water—once you hit your race fueling routine after the swim, start targeting your carb and sodium plan promptly during the bike.
As you approach the final stretch, look for a clean line to the exit and keep your cadence steady to avoid turning over too hard. Transition smoothly—your goal is to be ready to ride rather than to “win” the last 50–100 m.
Your T1 flow should be: control breathing on the beach/exit, remove wetsuit if you have one (official ruling is set on race morning—confirm in the IRONMAN athlete guide), then secure nutrition, glasses/helmet, and start drinking early. Don’t oversprint leaving T1; get clipped in efficiently and settle for a controlled ramp-up during the first part of the ride. Because the course is rolling, plan to stay balanced through small rises—stand only briefly if needed to smooth out power delivery.
On the 93 km rolling bike with 418 m of gain, the wind matters: you have 6.1 m/s from the NW, so expect it to influence stability and comfort depending on how sections line up. On headwind portions, smooth power and higher cadence (rather than mashing) will keep fatigue from building; on tailwind sections, avoid riding too hard just because speed rises—stay on your effort targets. Aim to hit your fueling target consistently: 90 g carbs per hour, 750 mg sodium per hour, and about 650 ml fluid per hour. With moderate heat, prioritize drinking to stay ahead of thirst, and use the rolling terrain to take carbs/sips during easier moments so you don’t force intake during every climb hard moment.
As you near the end of the bike, focus on arriving at T2 with steady legs and an intake rhythm still intact—don’t let fueling slip just because the run is close. Shift into run mode mentally: calm breathing, light but confident cadence, and set up your transition so you can start the 21.1 km without hesitation.
T2 is about converting bike effort into repeatable running mechanics. Expect your legs to feel “reloaded but not free” off the bike—stay tall, shorten your first steps slightly, and let your heart rate settle for the first few kilometers. Take a moment early to confirm you’re moving comfortably before you start chasing pace; this is where many athletes overcook it after the bike.
The run is 21.1 km with 64 m of gain and a flat/fast profile, so you’ll be tempted to push early. With moderate heat and a NW wind that can show up as headwinds or crosswinds at different points, keep your pacing effort-based: if the wind makes one section feel harder, don’t automatically compensate with surges. Since you’re already trained into your full-race fueling, start maintaining your intake strategy during the run (carbs and fluids), adjusting by how your stomach feels rather than by the clock. Use the flat terrain to maintain efficiency—smooth stride, relaxed shoulders, and steady breathing—so you can finish strong in the final third rather than fading from early speed.
The two things that win the back half: hold your effort steady when the course feels “too easy,” and keep drinking and taking carbs even if you feel good. In the final kilometers, gradually increase your cadence and commit—this is a run designed to reward control plus late push.
Confirm official race-day equipment guidance (including wetsuit rules) in the IRONMAN athlete guide, since conditions can vary and the call is made on morning-of.
Results by year
Every edition of this race in our database. The course and conditions can shift year to year — see who qualified and the World Championship slot rolldown for each.
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Weather is a 10-year climatology (typical, not a forecast). Course tracks are approximate, derived for planning — verify against the official course. Maps © OpenStreetMap. Not affiliated with or endorsed by the IRONMAN Group.