IRONMAN 70.3 Westfriesland

Get to the water early so you can find your sighting reference and settle into a rhythm before the start. Swim smart on day-of Westfriesland crowds: go with your seed/expected pace, keep breathing calm in the first scramble, and avoid sprinting the first 100–200 m. For the first few minutes, focus on clean entry, smooth body position, and consistent strokes—once you’re clear of feet, then build to your planned effort. Plan your T1 flow: cap/goggles off quickly, run to your bike with controlled footing, and take a second to check helmet on, shoes ready, and any nutrition you’ll start consuming immediately on the bike within reach.

You’ll cover 1,902 m of freshwater with conditions that vary, so treat this as a “control the effort” swim rather than a race for distance. Expect to be drafting at first due to traffic; once you find open water, lock in a repeatable cadence and sight only as needed to stay on line. With freshwater that can change day to day, prioritize breathing comfort and smooth turns/rolling where the course guides you, rather than chasing every surge. Fueling during the swim is minimal—save your calories and fluids for the bike, but be ready to transfer effort to the pedals immediately after T1 without blowing your heart rate.

In T1, transition efficiently but stay controlled: mount the bike calmly, find your cadence immediately, and start your fueling routine early. The legs will feel “springy but heavy” after running off the swim—settle your hips and keep the first 10 minutes smooth, letting your breathing match your target power/effort. Focus on getting your nutrition and drinking organized from the start of the ride so you don’t fall behind once the wind settles in.

The 91.4 km bike is flat/fast with only 52 m of elevation gain, so the opportunity is to ride fast without over-cooking it. Wind is a key factor: with wind from the W around 5.6 m/s, expect the headwind stretches to feel disproportionately harder and the tailwind sections to tempt you into surges—hold a steady effort and let your speed fluctuate. Stay aerodynamic and position-aware; if you use the pack/lines of riders, do it deliberately and avoid sudden moves when gusts hit. Start consuming your target fueling on the bike and keep it consistent: aim for 90 g carbs per hour, 750 mg sodium per hour, and about 650 ml fluid per hour, adjusting only slightly for how your thirst and stomach respond in the moderate air (14–21.8°C). On a flat course, your best defense against fatigue is even pacing and continuous hydration—don’t wait until you feel thirsty to drink.

In T2, expect your legs to feel stiff and your heart rate to jump—commit to a smooth first 1–3 km and let the stride loosen up. Keep your cadence high and form tall; don’t sprint out of the gate even though the run is flat/fast. Re-check your plan for fluids and carbs so you’re already consuming at a steady rate immediately once you’re running.

You’ll run 21.2 km with a flat/fast profile and only 17 m of elevation gain—so conditions and pacing matter more than hills. The moderate heat (air temp roughly 14–21.8°C) can still add up over time; use aid stations to prevent a “slow burn” instead of waiting for late-race cramping. With wind from the W and a generally breezy feel, you may not notice dehydration early—keep drinking to your plan rather than by thirst alone. Keep your intake steady through the run; your bike targets (90 g carbs/hr, 750 mg sodium/hr, ~650 ml/hr) are the baseline for total fueling strategy—if you don’t have a separate run plan, carry the same consistency mindset so your engine stays fed. Flat courses reward controlled pacing: early “slightly controlled” usually turns into a strong mid-race and a faster finish, especially after a wind-affected bike.