AI synthesis with sources · 4 min · edition 2026
The Run at Busselton: 21 Flat Kilometers, Two Laps and Nowhere to Hide
A fast coastal course with the jetty at its center: how to pace yourself when the course never slows you down and the weather can change everything.
Two flat laps along the coast
The run leg is a half marathon over two laps, flat profile, along the Busselton coastline with the famous jetty at the center of the course. You pass through the crowds twice per lap: four total passes through high-energy zones, with plenty of support at the key points. Visually, it's one of the most beautiful runs on the oceanic circuit. Tactically, it's a trap for anyone who runs by feel.
The flat-course paradox
On a flat course there's nothing to slow you down: no climb to force a pace, no descent to let you recover, no change in muscle use. It's the exact same motion for 21.1 km, after 90 km spent in the aero position. The physical demand is clear: the ability to hold an even pace for hours. If your pace drifts by 20-30 seconds per km on your long runs without you noticing, you'll pay for it here.
Weather: be ready for two different races
Race date is December 6, peak Australian summer, with a typical range of 16-23°C. But race reports from the full-distance event on the same courses tell of opposite editions: rain and a strong headwind on the run in 2024, intense heat in 2022. The run is along the coast and exposed: if you draw the hot year, there's no shade to save you; if you draw the windy year, half of every lap will be into a headwind. The decision to make now: build two race plans, one for heat and one for wind, and choose which one to activate only after checking the week's forecast.
Pacing: four 5 km blocks
The simplest method that works here: split the half into four 5 km segments plus the finish. In the first block, check your pace on your watch, not by feel: after the bike your legs always lie, and the crowd at the jetty will make you speed up without noticing. First block at goal pace or slightly under; second and third steady; the last one is the only place you're allowed to push. Rough benchmarks (our estimates): 2:30 for the relaxed finisher, 2:05 for the mid-pack goal, 1:45 for fast runners, 1:28 for top age-groupers.
Aid stations, salt and the hot scenario
Common sense from trained athletes, not medical advice: if the forecast points to the hot year, carry salt tablets. On a flat, exposed run your sweat rate climbs and the aid stations alone may not be enough for heavy sweaters. Test your strategy on long bricks: everything you take on race day must have already gone through your stomach in training. A recurring tip from race reports: keep a spare gel in T2 and use a race belt, so you start the run without thinking about anything.
Cut-offs and what to do now
The overall time limit is 8h30 from your start with a rolling start: if you're inside the bike cut-off, you have plenty of margin to finish the run even walking the aid stations. Test to do in the coming weeks: a brick with a long bike ride in aero followed by 12-15 km of running split into 5 km blocks at controlled pace. If the third block holds the pace of the first, you're ready for this course. If it falls apart, that's where the work is, not on speed.