IRONMAN 70.3 Aix-en-Provence

Get to the water early for a quick warm-up swim (2–3 minutes progressive, then a few strong strokes) so you’re not muscling the first minute. Line up based on your expected pace; for a crowded start, position slightly to the side of the fastest pack to avoid being repeatedly stopped by slower swimmers. In the first few minutes, settle into rhythm—shorten up slightly if you find traffic, and focus on calm breathing rather than sprinting for position.

You’ll cover 1949 m in water around 18.8°C, so expect good buoyancy and the ability to swim continuously without overheating. Breathe to the wind/current as you settle—if the wind is pushing from the W outside the water, use sighting to keep your line stable and avoid drifting wide. Aim for a steady effort you can repeat for the full distance; the temptation is to surge early into the crowd, but that usually costs you on the second half. Fuel isn’t a target on the swim, so use the time to hydrate your routine before you enter T1—your race carbs and sodium start in earnest on the bike.

Plan your T1→bike flow before you enter transition: rack position, helmet on before shoes if that’s your habit, and then shoes on by staying organized. As you remount, prioritize cadence and smooth power for the first 5–10 minutes—don’t chase speed immediately off the line. You’ll want to settle into a steady climbing-ready gear and keep your breathing calm so your legs are fresh for the 908 m of elevation.

The bike is 86.6 km with 908 m of climbing on a hilly profile, so treat it like a power-and-efficiency day rather than a flat-out fitness test. With wind about 4.9 m/s from the W, expect it to make some sections feel deceptively hard (usually into/headwind) and others feel easier (tailwind)—stay disciplined with power on the headwind portions and don’t cash in too aggressively on the tailwind. Your fueling target is 90 g carbs per hour with 750 mg sodium and about 650 ml fluid per hour; start early rather than waiting until you feel hungry/thirsty. Because this course includes repeated climbs, take in fuel consistently on both the uphills and the flats—if you wait for “easy” moments, you’ll under-fuel. Fluid intake should be matched to conditions (moderate heat, air up to mid-20s); if you’re taking in the full volume target, you’ll reduce the risk of getting behind as the bike progresses.

In T2, focus on getting your shoes and posture right: stand tall for the first 10–20 seconds, then let your cadence come up naturally as you transition into running. Off the bike, expect your legs to feel heavy on the first ramps—start slightly conservative so your heart rate doesn’t spike before the rolling 21.1 km settles in. As you run the first aid points, lock in your routine early so you don’t “catch up” later when the effort rises.

You’ll run 21.1 km with 130 m of rolling elevation, which means the course won’t be a pure flat tempo—expect repeated small surges where it’s easy to drift faster downhill/into flats and slower on the ups. With moderate heat (air as high as 24°C) and a wind around 4.9 m/s, aim for controlled effort that you can sustain; fight the urge to sprint early when the legs still feel awkward. Use aid stations to match your fueling plan you executed on the bike—don’t allow the first half of the run to become a “build later” strategy, because the rolling profile makes it harder to recover once you fade. Hydration matters: sip regularly, and if the air feels warmer than expected, increase fluid at the stations rather than cutting pace abruptly. The goal is to keep your mechanics efficient—shorten slightly on the uphills, stay relaxed and quick on the downs, and keep breathing rhythmic.