IRONMAN 70.3 Michigan

Do a short, temperature-appropriate warm-up before you get in the water, then focus on controlled breathing and staying relaxed as you find your pace. Get into the start area early and seed yourself so you’re not stuck surrounded by faster swimmers or repeatedly getting boxed in. For the first few minutes, aim to settle into a steady rhythm rather than sprinting—let the pace come to you as traffic spreads out.

You’ll swim 1,940 m in freshwater with temperature varying, so treat the first stretch as a calibration period—smooth strokes and consistent breathing will keep your heart rate from spiking. Expect some churn early as swimmers converge, but once you’re established, your job is to hold form (stable head position, steady catch) and avoid overreaching. With moderate air temperatures later in the day and typical race pacing, your best advantage is swimming efficiently so you can transition well and start the bike under control. During the swim itself, prioritize oxygenation and body position; for fueling targets, plan to come off the swim ready to execute the bike nutrition plan right away.

In transition (T1), keep it mechanical: exit cleanly, grab your helmet first, then glasses/hat if you use them, and get your shoes on without rushing. As you mount, focus on smooth pedaling to settle your legs—don’t chase watts for the first minute, especially while traffic clears. Use the opening stretch to set nutrition and hydration timing for the race: take your first planned fluids and carbs early rather than waiting until you feel thirsty.

The bike is 90.4 km with 257 m of elevation gain on a flat/fast profile, so the course rewards steady power and efficient aerodynamics. Wind is 5.4 m/s from the S, so expect crosswind/counterwind changes as the course orientation shifts—stay composed on any gusty sections and avoid unnecessary steering corrections. Because the elevation is low, it’s easy to overcook early; aim for consistent output and smooth cadence, using controlled surges only when you truly need them. Fueling target is carbs 90 g/hour with sodium 750 mg/hour and fluids 650 ml/hour—start hitting that rhythm once you’re settled, and keep it even rather than front-loading. If you feel yourself drifting high on effort, reduce power slightly and let your fueling catch up; on a fast course, that’s often the difference between a strong second half and blowing up.

In T2, focus on getting up to speed gradually without jolting your system—your first steps should be light, not punchy. Tighten transitions mentally: shoes on, then commit to a consistent first-kilometer rhythm. Once you’re rolling, think “spin to settle” rather than “spring to sprint”—your legs will feel heavy early even on a flat/fast course.

The run is 21.3 km with only 30 m of elevation gain on a flat/fast profile, which means pacing and gut management matter as much as fitness. Temperatures are moderate with air temperatures ranging from 15.1°C to 22°C, so avoid starting too hot—your pace should feel sustainable early and build from the middle on. With a S wind during the day, expect it to come and go along the course lines; keep your stride relaxed and use your arms to maintain rhythm rather than letting the wind shorten your steps. Continue your fueling with the race’s offered plan and stay on your target: carbs 90 g/hour, sodium 750 mg/hour, and fluids 650 ml/hour (adjust in real time to what you’re able to take from aid stations). If you’re behind on fluids, prioritize drinks early in each aid-station window—don’t wait until you’re already cramping or overheating.