IRONMAN 70.3 Duisburg: Course, Elevation & Route Profile

Course & Elevation

The swim takes place in the regatta course of the Sportpark Duisburg, a rowing and canoeing venue opened in 1935 that has hosted world championships in both. For the 1.9 kilometres that means calm, current-free water in a straight artificial basin, without chop and without navigation problems. The start is rolling, inside a morning time window, so you do not enter the water in a mass wave.

The bike course leaves the inner harbour over the Brücke der Solidarität and follows the Rhine towards Baerl and Moers, twice around the same roughly 44 kilometre loop. It moves within an elevation band of 23 to 38 metres, 77.7 per cent of it is level, and the only registered climbs are two 300 metre ramps at 4.7 per cent, one per lap. What matters is something else: the course is closed to car traffic entirely on race day, which is unusual in a conurbation like Duisburg and allows an uninterrupted time trial with no braking. Drafting remains banned.

The half marathon is three laps of roughly 7.1 kilometres each along the regatta course and through the green Sportpark. At 90.1 per cent level and two metres of climbing per kilometre it is a pure speed run; in 2022 participants voted it the third-best 70.3 run course in Europe. But three laps also mean running past the same spot three times, each time slower than the last.

Pacing Strategy

The rolling start and the calm regatta basin take away two classic excuses: there is no scrum to explain the first 400 metres and no chop to justify a slow swim. So swim the 1.9 kilometres to plan rather than to feel, and use the calm water to settle into an economical stroke early.

The race is decided on the second bike lap. A closed, flat course without braking allows an almost constant output, which is exactly why it is usually set too high. Across 90 kilometres without climbs there is no hill on which an over-ambitious average power reveals itself; it shows up instead over the first five kilometres of the run. Set your target output clearly below what this course would allow, and accept that your speed drops in the headwind stretch along the Rhine.

The main trap is the lap structure of the run. Three laps of the same path mean every split is directly comparable, and the course offers neither rise nor fall to explain a collapse. Run the first lap deliberately around ten seconds per kilometre slower than target race pace. Then the conditions: mid-August in the Ruhr, a start between 8 and 9:15, and a half marathon that consequently runs into the early afternoon; on an open regatta course without shade, the fuelling strategy becomes part of the pacing question.

Training plan for IRONMAN 70.3 Duisburg: 12-week build

The middle distance at Duisburg takes an age-group athlete roughly four and a half to six and a half hours. For long stretches the demand is unusually uniform: a sustained aerobic effort well below threshold on bike and run courses that offer neither climbs to over-cook nor descents to recover on.

That is exactly what makes the preparation specific. On a closed, flat course it is not climbing ability that sets your time but how long you can hold an aerodynamic position without losing output, and how well your nutrition works across two and a half to three hours of constant load. Both are trainable and both are routinely neglected in favour of intervals.

What decides the race is the change into the half marathon. After 90 flat kilometres without any change of rhythm, many athletes need several kilometres to find a clean running stride, and three identical laps make every loss of pace visible. The training emphasis therefore belongs on long rides of three to four hours containing 2 to 3 times 30 minutes at race effort in the aero position, each followed by a brick run of 20 to 40 minutes on flat ground.

Add a rehearsed race nutrition plan with a fixed carbohydrate intake per hour, neck and trunk work for the aero position, and heat adaptation for an August run. The swim is the technically simplest part of the day: in a current-free regatta basin, even pacing across 1.9 kilometres matters more than open-water tactics, so long controlled continuous swims are the appropriate preparation.