IRONMAN 70.3 Les Sables d'Olonne

Arrive early, get a quick ocean warm-up if possible, and practice your first 6–10 strokes so you settle into the feel of the water before you go hard. In the start area, seed based on your current swim pace and comfort with chop—if you’re between groups, choose the slightly slower cluster so you can focus on rhythm rather than contact. In the first few minutes, prioritize controlled breathing and even effort; treat it like “get to the first buoy calmly,” not a sprint for position.

You’ll swim 1903 m in typical wetsuit-legal conditions (confirm the official wetsuit ruling on race morning in the IRONMAN athlete guide). Expect 19.9°C water to feel firm at first—stay relaxed for the first few hundred meters so you don’t over-breathe. With ocean surface variability and wind influence coming from the NW, sight frequently and keep your line stable; the goal is to avoid zig-zagging that costs time and energy. Fueling on the swim is minimal—save the carb/sodium intake for the bike and be ready to transition smoothly when your pace settles.

Plan a clean T1: get your wetsuit off efficiently (if wetsuit is allowed), set yourself up to mount without rushing, and organize shoes/gear before you enter the chute. On the first minutes of the bike, keep cadence smooth and effort controlled while the wind and rolling terrain start to stack up. Treat the early rolling sections as a warm-up for your nutrition rhythm so you don’t chase power immediately after leaving T1.

Ride 93 km with 421 m of rolling elevation—this is a course where surges are easy and endurance fatigue is real, especially if you overcook the climbs. With NW wind around 6.3 m/s, expect it to nudge pacing: use the wind to your advantage on exposed stretches, but don’t spike power when the bike feels fast; hold a steady, repeatable effort through the ups and downs. Your fueling target is 90 g carbs per hour, 750 mg sodium per hour, and about 650 ml fluid per hour—start early enough that you’re not “catching up” later, and take it consistently across the whole ride rather than in big chunks. Keep fluid going even if the heat feels moderate; cool-down control helps your run legs. On rolling terrain, focus on smooth power through each rise and recover by staying seated or using a light cadence rather than coasting long on fatigued legs.

In T2, prioritize quick but deliberate transitions: secure your shoes, tighten/adjust anything that could rub, and immediately settle into a controlled first kilometer. The key is how the legs feel off the bike—expect stiffness and a “delayed” burn at the start, so start slightly easier than you think you should. Mentally pick an effort target based on feel (not the stopwatch) for the first few minutes so you don’t overrun the flat/fast profile.

Run 21.1 km with 64 m of mostly flat/fast terrain—once you get past the initial shakeout, this course rewards disciplined pacing and good temperature management. In moderate heat and with NW wind, you may feel cooler when the wind hits you, then heat back up when you’re in sheltered stretches; use that to regulate effort rather than letting sensations dictate your pace. Because the run is fast on paper, the biggest risk is going out too hard—stay controlled early so you can build later instead of paying with cramping or slowing in the final third. Continue fueling and hydration from the race’s aid stations in a way that matches your earlier bike rhythm; the goal is to maintain steady carbohydrate availability and avoid dehydration that saps form. If aid stations are frequent, take small, consistent sips/amounts; if they’re spaced farther, commit to taking more at each stop to smooth absorption.