IRONMAN 70.3 Duisburg

Aim to arrive early so you can get your suit on and settle your body before call-up. Do a short, controlled warm-up focusing on relaxed strokes and breathing rhythm, then get into your seeded position based on your swim pace so you spend less time punching through traffic. For the first few minutes, start at effort you can hold for the whole 1.9 km—smooth cadence beats rushing—then progressively find your target rhythm once the field strings out.

You’ll cover 1,944 m in freshwater with temperature varying race to race, so treat the start as “controlled,” not “all-out.” Expect a mass start environment where the first stretch is crowded; settle quickly into clean water and avoid repeated sprinting to pass swimmers. Because the bike and run are flat/fast, your best move is to keep swim effort steady and finish feeling like you could still turn over smoothly for transition. Fueling during the swim isn’t the priority—focus on breathing, body position, and keeping the stroke efficient so you can execute T1 cleanly and get on the bike strong.

Your T1 goal is speed with control: exit the water, secure your gear efficiently, rack your bike without rushing, and start your first pedal strokes immediately with a smooth ramp. After you mount, give yourself a few minutes to settle—find your cadence and start building toward your target power/effort without spiking too early. With a flat/fast 89.1 km course, manage “breezy speed” by keeping your effort consistent rather than chasing speed on every gust; if you’re between gears, choose stable cadence early.

The bike is 89.1 km with 189 m of elevation gain and a flat/fast profile, so it’s designed for steady output. Wind is from the SW at about 4.6 m/s, which typically means cross/headwind effects on various stretches—stay composed and don’t let gusts trick you into overeating effort on the early sections. During the ride, execute your fueling consistently: target 90 g carbs per hour, 750 mg sodium per hour, and about 650 ml fluid per hour, adjusting only for what you can comfortably absorb. Keep drinking regular sips rather than waiting until you’re thirsty, and take in carbs on a schedule so your run legs feel prepared. Because the course is fast, you’ll likely be tempted to push the “easy” parts—prioritize smooth power and aerobic steadiness so you’re not paying for it on the 21.7 km run.

Your T2 (bike→run) plan is to protect the first 10–15 minutes. As you rack your focus off the bike, expect your legs to feel heavy at first—settle into a slightly shorter stride and focus on smooth, quick turnover rather than forcing pace immediately. Rehydrate if you need it from your run setup, but don’t dilute the effort plan—start the run controlled so you can open gradually on a flat/fast 21.7 km course. Mentally, treat the early miles as a “launch phase” toward a steady rhythm rather than a sprint.

The run is 21.7 km with 16 m of elevation gain and a flat/fast profile, so the limiting factor becomes pacing and how well you fueled on the bike. In moderate heat (air temp ranging roughly from 14.7°C to 22.8°C), watch for the trap of running by feel—if it warms up, your speed can drop even if you try to hold it. With the prior SW wind influence still in your legs, keep your cadence relaxed and consistent; don’t overstride into any gusty sections. Continue your race-day hydration and carb intake plan (you’ll have been targeting 90 g carbs/hr on the bike); on the run, prioritize steady intake and small, frequent drinking so you stay even through the late stages. Since the course is designed to move fast, your job is to keep form crisp—shoulders relaxed, steady breathing—and gradually increase effort only if you’re still absorbing fluids effectively.