IRONMAN 70.3 Duisburg

Focus on arriving calm and seeded so you’re not forced to surge in the first minutes. Get a quick warm-up in the water (or just before) that matches race effort—short easy strokes into a few controlled build intervals. At the start, take your first strokes efficiently and find clean water quickly; if you’re in contact, prioritize rhythm over power and avoid sprinting out of the gate. Once you’re approaching the last portion, settle into a sustainable cadence so you can stand up and transition without feeling “empty.”

Your swim is 1916m in freshwater, with water temperature varying, so treat the opening stretch as a temperature-and-rhythm acclimation. The course is designed for a fast day, but river/lake conditions can change how straight you swim—aim to keep your line consistent and use small course corrections rather than big sidesteps. With the overall day set up as moderate heat, you’ll want to avoid overshooting early; instead, keep strokes smooth and breathing steady so you can transition effectively. Fuel during the swim typically isn’t a primary target—use this leg to save your stomach for the bike and run.

Your T1 should be efficient and calm: get your wet-to-dry rhythm, secure everything before you fully commit, and do a brief sanity-check that your bike fit and shoes are ready to lock in immediately. Off the mount, focus on smooth cadence and controlled acceleration for the first few minutes—flat/fast courses punish sudden spikes. Use the early kilometers to settle your breathing and lock into your fueling schedule so you’re not behind once the ride fully gets going.

You’ll cover 89.2km with 142m of elevation gain on a flat/fast profile, so the bike will feel strong and “easy” early—resist the temptation to chase speed. Wind is 4.6 m/s from the SW, so expect most of the ride to include some crosswind/headwind components that can push you off your line; keep a steady position and make small steering corrections rather than reacting to every gust. In moderate heat, prioritize consistent sipping and planned intake—your target is about 90g carbs, 750mg sodium, and 650ml fluid per hour, spread across the ride. Use the flatter terrain to hold steady power and cadence, and take fueling opportunities even if the pace feels good; staying ahead on carbs and fluid is what keeps your run from slipping later.

Your T2 is where your legs tell the truth. Expect the first 1–2km to feel stiff as the flat/fast run begins after a steady bike; keep strides controlled and let turnover build naturally. Get your first drink/aid intake rolling early so you don’t chase hydration later. Mentally decide what you’ll do if the wind picks up or if you feel good early—your plan should keep effort steady rather than spiking.

You’ll run 21.3km with 15m elevation gain on a flat/fast profile, so it’s mostly about pacing, temperature, and staying fueled. With moderate heat and SW wind (often felt in bursts), focus on maintaining a consistent effort rather than chasing pace when conditions feel favorable. Keep your fueling consistent with your race target—about 90g carbs, 750mg sodium, and 650ml fluid per hour—using aid stations to hit the numbers instead of relying on thirst. If you start to feel heavy in the later kilometers, reduce intensity slightly and tighten your running mechanics (shorter stride, relaxed shoulders) while sticking to intake to prevent the “blow-up” feeling.