IRONMAN Knokke-Heist

Get to the venue early enough to settle your breathing in the river environment and identify your entry point. If seeding is available, start near swimmers with a similar pace so you don’t fight for space in the first stretch. In the first minutes, keep strokes efficient and calm—focus on body position and avoiding hard surges while you find clear water. Set your sighting routine immediately and treat the opening few hundred meters as control, not a sprint.

This is a 3801 m river swim where water temperature varies, so expect some fluctuation in comfort and don’t let that push you into overreaching. The river setting can mean currents and changing water texture/sight lines; stay patient with your line and sight often enough to keep your effort steady. Plan to drink nothing during the swim—your job is to exit controlled and ready to remount quickly for the bike. Aim to keep your stroke rate smooth and your breathing rhythm consistent through the distance so you can transition well rather than arriving to T1 exhausted. If conditions feel choppy or visibility drops, shorten your sighting intervals and focus on maintaining forward momentum with minimal extra energy.

Use T1 to set up the bike cleanly: rack your gear so you can move efficiently, tighten anything you can before you fully commit to riding, and start with smooth leg turnover. When you mount, focus on controlled power for the first segment—your legs will feel “soft” coming off the swim, so settle into cadence before you push. Because wind comes from the SW, be ready for gusty crosswinds/side pressure—stay relaxed in your upper body and keep your line predictable. Hydrate early in the ride; don’t wait until you feel thirsty.

Wind is 5.7 m/s from the SW, which can affect stability and comfort—expect some aerodynamic penalty and plan for smooth steering inputs, especially on any crosswind or exposed sections. With moderate heat, prioritize cooling through fluid intake and don’t let perceived effort climb due to rising body temperature. Fuel for the full ride using the targets: 90 g carbs per hour, 750 mg sodium per hour, and 650 ml fluid per hour, adjusted only to keep you consistent with those targets across the day. Drink and eat regularly from the start, aiming for a steady rhythm rather than occasional large intakes.

In T2, expect your legs to feel heavy at first—your job is to get circulation back quickly without forcing pace. Spend a few steps re-finding your cadence and posture: tall but relaxed, short quick strides to re-activate the calves/feet. As you exit the transition area, take the first section by feel and build gradually into your target effort rather than reacting to early adrenaline.

The run is 42.2 km after 180 km of riding, so the biggest factors are heat management and staying on top of fueling. Air temperature spans 14 to 21.6°C with moderate heat, but don’t assume it will stay cool—use fluid to manage body temperature before you feel overwhelmed. The SW wind can still be felt on the course and may change how steady your effort feels from lap to lap; keep your pacing disciplined and avoid chasing “fast” segments that cost you later. Use your fueling plan consistently throughout the run; target 90 g carbs per hour, 750 mg sodium per hour, and 650 ml fluid per hour to maintain performance and reduce the risk of late-race depletion. Eat/drink regularly at aid stations as needed to match the same hourly targets, and prioritize fluids earlier than you think you need—especially if the wind and sun combine to dry you out.