IRONMAN 70.3 · St. Polten · 23 May 2027
How to train for IRONMAN 70.3 St. Pölten
St. Pölten has more than 20 years of history, and the organiser now sells it as the step before a mid-season full-distance race. Plenty of athletes treat it that way: a May hit-out on a course the organiser calls rolling, with a flat run to finish. That reading is half right. The run is flat. The bike saves its hardest work for the part of the day when a warm-up race has usually stopped being one.
The climbing on this course is packed into two places, and the big one starts at kilometre 62, after about an hour of flat road. A Trained athlete's day of 6:02:53 is set by what is left in the legs when the road turns up there, and it is read out on a run with nowhere to hide.
By Kian Briel, founder. Analysed by engine 1, updated
What is actually on the road
The organiser's own course files, drawn the way the Event Analyzer draws a member's race.
- Swim1.9 km3 m upCourse file
- Bike89.5 km769 m upCourse file
- Run21.6 km75 m upCourse file
The race opens with a two-lake swim, 1.9 km, laid out so spectators can stand close from the first strokes. The organiser calls the swim unique, and the demand reading agrees.
The bike is one loop of 89.5 km through vineyards, open landscapes and along the river, with 769 m of climbing. The first 20 km are flat. Then comes a short hilly block to about kilometre 31, with pitches of 6.1 and 5.8 percent and a steep drop of more than a kilometre at 8.6 percent. Then flat again, for about 31 km. At kilometre 62 the road climbs 3.1 km at 7.5 percent and keeps rising to the course's high point of 556 m near kilometre 67. From there it falls away, climbs once more for 1.9 km at 4.7 percent, plunges down a 539 m pitch at 9.8 percent, and runs flat for the last 11 km.
The run is 21.6 km through the baroque old town and into the modern part of the city, with 75 m of climbing. The engine reads it as one flat segment from start to finish.
Course shape by distance
- Flat 85%
- Climbing 8%
- Descending 7%
The longest stretches
- Bike, flat20.3 km19% of the bike
- Bike, climbing3.09 km12% of the bike
- Run, flat21.6 km100% of the run
Each row is one unbroken stretch of the course that keeps the same shape the whole way. The number is how much of that leg you spend inside it, and it comes out the same whether you are fast or slow.
What this course asks of each leg
Twelve training dimensions scored for each leg against its own course, the way the Event Analyzer scores a member's race.
Aerobic endurance and muscular endurance, on the bike first. The demand model scores them at 85 and 82 for the bike leg, with threshold capacity and threshold durability level at 70, and because the bike fills more than half of a Trained athlete's day, the first six demands in the cross-leg ranking are all bike demands. The run's pair reads 85 and 81.
Two readings are specific to St. Pölten. Technical skill scores 76 for the swim, far above the 38 it scores on the bike, and that is the two-lake swim. The other is the climbing. High-intensity capacity reads 54 on the bike against 40 on the run, and strength and force 48 against 30. Give the engine this bike file and it compiles eight hard efforts of a minute and a quarter, with five minutes of easy riding after each. That long gap between efforts is the course's shape: climbing arrives in lumps, with plenty of flat road around it.
Weather is a small part of the story. Environmental resilience scores 10 on every leg. The organiser logged a high of 26 C in 2026 and 24 C in 2024, but in 2025 the high was 16 C and the low 9 C. In late May, cold is the likelier problem.
Now the bands. A Trained athlete swims 38:11, rides 3:12:26 at 182 W and runs 2:02:16, for 6:02:53. The Competitive band finishes in 5:12:27 from 4.15 W/kg at 75 kg and 4:20 /km threshold pace, 27 minutes faster on the bike and 18 on the run. Most of that bike gap is made on flat road, not on the climb, because the flat roads are most of the ride.
- Aerobic endurance85
- Muscular endurance80
- Technical skill76
- Threshold capacity70
- Aerobic durability65
- Threshold durability65
- Fueling resilience55
- High-intensity capacity40
- Anaerobic capacity25
- Strength / force20
- Environmental resilience10
- Sprint power5
Nymiva reads what you can already show, from your own data
Connect your training history and the Focus Lab scores the same twelve dimensions this course demands against where you sit today. The gap between the two is what you train.
- MeasuredFrom your thresholds and testsThreshold power, threshold pace, critical swim speed and field tests you have done. The dimensions they can carry are scored directly.
- EstimatedFrom your training historyConnected activities are read for what they prove: long efforts, late-session fade, repeated hard work, fueling on long days. Each score says how it was read.
- ProxyFrom a stand-in, and named as oneWhere only an indirect signal exists, the score carries the proxy it came from and a lower confidence, never a number dressed as a measurement.
- UnmeasuredHonestly blankA dimension nothing in your data can answer stays unmeasured. It is never a zero, and the plan does not pretend to know it.
Every dimension ends in one word
- Develop the course asks more than you can show
- Maintain close enough to hold at the minimum dose
- Covered nothing to build here
- Unmeasured the course needs it, your data cannot say yet
Nymiva reads twelve dimensions off the course and the same twelve off the athlete. The course side comes from the file on this page. The athlete side comes from thresholds and connected training history, and every score says where it came from and how far it can be trusted. A gap exists only where the course asks more than the athlete can show, and gaps are weighted by the share of the day they fill. The bike fills more than half of it here, the swim about a tenth.
This page has no athlete, so the season beneath it cannot know anyone's gaps. It takes the plainest assumption, that they fall where the demands are largest, and lays out 24 weeks in 5 developmental blocks with a two-week taper. Aerobic endurance leads the first block in all three sports. Threshold capacity leads the second on the bike and in the water while the run works on aerobic durability. The third block puts swim technique at the front, for the two lakes, with threshold durability leading the bike and threshold capacity the run. Muscular endurance leads the fourth, and aerobic endurance returns before the taper. A member's season starts from their own numbers and will not look like this one.
Train the bike to protect the run
Which demands matter most across the whole race. A leg's demand counts for as much of the day as that leg takes, so a score of 85 on the bike outweighs the same score on the swim.
- 01Aerobic enduranceBike leg, 53% of the day85 × 53%45
- 02Muscular enduranceBike leg, 53% of the day82 × 53%44
- 03Threshold capacityBike leg, 53% of the day70 × 53%37
The bike takes 53% of the Trained reference band’s day, so its demands carry the most race weight. What the bike leaves in the legs is what the run gets.
Which demand gets a block, and when
The engine freezes one lead focus per sport on every developmental block, holds the rest at maintenance, and verifies before it reprioritises.
An illustration, not your plan. This page has none of your data, so the season below is the engine’s answer to one stated assumption: that your gaps line up with what IRONMAN 70.3 St. Pölten demands. Your own season is built from your history, your thresholds, the days you can train and the races you have entered, and it will differ from this in its priorities, its sessions and its load.
- 01Run muscular endurance, a practice block4 weeks
- 02Run aerobic endurance, a development block4 weeks
- 03Bike muscular endurance, a practice block4 weeks
- 04Bike aerobic endurance, a development block4 weeks
In the order the allocator places them, general first, most race-like last.
- Week 1PrepPrep
A lead-in week. It develops nothing by design.
- Weeks 2 to 5Foundation 1Closes with a recovery week
- PriorityBike aerobic endurance
- PriorityRun aerobic endurance
- PrioritySwim aerobic endurance
- SupportBike muscular endurance
- SupportRun muscular endurance
- SupportSwim muscular endurance
- SupportSwim technical skill
- SupportBike threshold capacity
- SupportBike threshold durability
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportRun aerobic durability
- Weeks 6 to 9Foundation 2Closes with a recovery week
- PriorityBike threshold capacity
- PrioritySwim threshold capacity
- PriorityRun aerobic durability
- SupportBike aerobic endurance
- SupportRun aerobic endurance
- SupportSwim aerobic endurance
- SupportBike muscular endurance
- SupportRun muscular endurance
- SupportSwim muscular endurance
- SupportSwim technical skill
- SupportBike threshold durability
- SupportRun threshold capacity
- Weeks 10 to 13Foundation 3Closes with a recovery week
- PrioritySwim technical skill
- PriorityBike threshold durability
- PriorityRun threshold capacity
- SupportBike aerobic endurance
- SupportRun aerobic endurance
- SupportSwim aerobic endurance
- SupportBike muscular endurance
- SupportRun muscular endurance
- SupportSwim muscular endurance
- SupportBike threshold capacity
- SupportSwim threshold capacity
- SupportRun aerobic durability
- Weeks 14 to 17Event shaping 1Closes with a recovery week
- PriorityBike muscular endurance
- PriorityRun muscular endurance
- PrioritySwim muscular endurance
- SupportBike aerobic endurance
- SupportRun aerobic endurance
- SupportSwim aerobic endurance
- SupportSwim technical skill
- SupportBike threshold capacity
- SupportBike threshold durability
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportRun aerobic durability
- Weeks 18 to 21Event shaping 2Closes with a recovery week
- PriorityBike aerobic endurance
- PriorityRun aerobic endurance
- PrioritySwim aerobic endurance
- SupportBike muscular endurance
- SupportRun muscular endurance
- SupportSwim muscular endurance
- SupportSwim technical skill
- SupportBike threshold capacity
- SupportBike threshold durability
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportRun aerobic durability
- Weeks 22 to 23PeakPeak
The taper. Load comes down toward the race, content stays specific.
- Week 24RaceRace
Race week.
Held at maintenance between blocks
- Runmuscular endurance, aerobic endurance, aerobic durability, threshold capacity, threshold durability
- Bikemuscular endurance, aerobic endurance, aerobic durability, threshold capacity, threshold durability
- Swimaerobic endurance, aerobic durability, threshold capacity, threshold durability, muscular endurance, technical skill
Touches scheduled by each capability’s own decay, at a fraction of its development dose, so earlier work is still there on race day.
The sessions the blocks are built from
One entry per kind of work the block trains, at the intensity that work is meant to be done at. Where the same work runs at several lengths, the entry shows the span it grows across rather than one entry per length.
- Foundation 1 · Weeks 2 to 575 to 240 min
150 to 210 min at Zone 2
BikePower, Zone 2Trains aerobic capacity - Foundation 1 · Weeks 2 to 540 to 270 min
180 to 210 min at Zone 3, then 30 min at Zone 4
BikePower, Zone 3Trains aerobic capacity - Foundation 1 · Weeks 2 to 535 to 120 min
90 min at Zone 2
RunPace, Zone 2Trains aerobic capacity - Foundation 1 · Weeks 2 to 550 min
4 x 1.5 min at Zone 3, 6 min easy between
RunHeart rate, Zone 3Trains aerobic capacity - Foundation 1 · Weeks 2 to 545 to 51 min
4 x 8 min at Zone 2, 1 min easy between
SwimPace, Zone 2Trains aerobic capacity - Foundation 1 · Weeks 2 to 547 to 81 min
3 x 1000 m at Zone 3, 0.3 min easy between
SwimPace, Zone 3Trains aerobic capacity
8× rolling-course surges
1.3 min at Zone 5, then 1.3 min at Zone 5, then 1.3 min at Zone 5, then 1.3 min at Zone 5, then 1.3 min at Zone 5, then 1.3 min at Zone 5, then 1.3 min at Zone 5, then 1.3 min at Zone 5, 5 min easy between
Compiled by the deterministic course compiler from the organiser’s file: the course’s one repeatable requirement, rehearsed at a dose the progression allows.
- Bike
- 70 min
- Trains threshold durability
- Supports muscular endurance
- Supports high intensity capacity
24 weeks, laid out backwards from race day
The shortest runway Nymiva builds for this event type, with its blocks, recovery weeks, taper and race week in place.
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- Prep
- Foundation
- Event shaping
- Peak
- Race
- Recovery week
Your own season carries these same phases on your own dates, with the load solved from your fitness and the days you can train, and it changes when your data does.
What each level does on the day
Reference finish times per peer band, the pacing plan the model holds each band to, and where the day is decided.
| Band | Swim | Bike | Run | Finish |
|---|---|---|---|---|
| Recreational2:11 /100m critical swim speed · 2.47 W/kg at 75 kg · 6:08 /km threshold pace | 0:45:04 | 3:33:50 | 2:27:02 | 6:55:56 |
| Trained1:51 /100m critical swim speed · 3.03 W/kg at 75 kg · 5:06 /km threshold pace | 0:38:11 | 3:12:26 | 2:02:16 | 6:02:53 |
| Competitive1:36 /100m critical swim speed · 4.15 W/kg at 75 kg · 4:20 /km threshold pace | 0:33:02 | 2:45:32 | 1:43:53 | 5:12:27 |
| Elite1:26 /100m critical swim speed · 5.27 W/kg at 75 kg · 3:50 /km threshold pace | 0:29:35 | 2:31:11 | 1:31:54 | 4:42:40 |
Pacing plan
- 0 km-0.3%32.3 km/h37:38
- 20.3 km3.5%16.5 km/h0:44
- 20.5 km-0.9%35.3 km/h1:29
- 21.3 km-3.5%47.6 km/h0:19
- 21.6 km1%26 km/h3:10
- 23 km6.1%11 km/h10:25
- 24.9 km-1.1%36.3 km/h0:43
- 25.3 km5.8%11.5 km/h1:48
35 more segments in the full plan.
- Run: reach 4:20 /km and this course gives back 50:26.
Where it is decided
At kilometre 62, and in the hour before it.
The climb itself is honest. It is 3.1 km at 7.5 percent, the steepest sustained climb on the course, and the engine puts 11.6 percent of the bike leg on it. Nobody gets that climb wrong by choice. They get it wrong on the 31 km of flat road that lead to it, where the road is fast, the legs feel fine after the hills near kilometre 20, and holding a little over plan costs nothing you can feel. Arrive at kilometre 62 on the right number and the climb is five kilometres of steady work to 556 m. Arrive over it and it is where the day falls apart.
Then the steep drop, the flat ride home, and a run the engine reads as one flat segment, all of the run leg. There is no hill on it to blame and no descent to recover on. Whatever the climb at kilometre 62 took, the old town gives it back to you as pace, one kilometre at a time.
Getting it wrong
The opening 20 km invite the first mistake. They are flat, the field is fresh out of the water, and the engine puts 18.9 percent of the bike leg on that one stretch. It is the largest single block of time on the bike. Riders spend their best power here, then meet the pitches near kilometre 20 already above plan.
The second is treating St. Pölten as a warm-up in May and dressing for the calendar. The 2025 edition topped out at 16 C. A cold morning and a descent at 9.8 percent do not care how early in the season it is.
The third is the run. Flat roads, a lively atmosphere, spectators close by. Every one of those things says go. The run is 21.6 km long on this file, a little over the half-marathon distance, and a pace that feels easy through the baroque streets is the pace that fades before the finish.
Conditions on the day
- 2026high 26 C, low 13 C
- 2025high 16 C, low 9 C
- 2024high 24 C, low 14 C
From the organiser’s own records. Not a forecast.
Every session is a claim, every block is a test
A plan is not a calendar. Each key session states what it trains and how that is checked, and each block ends with a public verdict before the next one is chosen.
What a block promises
Bike aerobic endurance moves from your baseline to a stated target by the end of Foundation 1
- The baseline is your measured score when the block starts. The target is the score the model predicts for it.
- Verified at the block’s recovery week, by a field test or a refresh of the supply read from your history.
- Confidence rises by agreement between independent signals, never by one metric crossing a line.
- A block that misses its target is a public miss. The next block is chosen from what was proven, not from what was planned.
- 01Stimulus achievedThe work landed in the zone the session named, for the dose it named.
- 02Partially achievedSome of the work landed. The session banks what it can prove.
- 03Not achievedThe load may have been there. The stimulus was not, so nothing is banked.
- 04Data insufficientNo usable stream. The session is neither credited nor blamed.
- Session verified
- Progression banked
- Block verified
- Priority reassessed
- Plan adapted
Your numbers, this course
Analyze IRONMAN 70.3 St. Pölten against my fitness
The same simulation and the same Focus Lab read, on your thresholds instead of a band’s. Three numbers give a finish estimate and a partial read. A connected history gives the whole table.
The first 14 days are free.
- Trained band finish
- 6:02:53
- Of the day on the bike
- 53%
- Dimensions scored per leg
- 12
- Season runway shown
- 24 wk
Questions people ask
- How hilly is the IRONMAN 70.3 St. Pölten bike course?
- The organiser calls it both rolling and hilly, and both are fair. The one-loop ride climbs 769 m, but most of it is flat. The climbing sits in two places, a short hilly block from about kilometre 20 to 31 and one long climb from kilometre 62 that starts with 3.1 km at 7.5 percent and tops out at 556 m.
- Is the IRONMAN 70.3 St. Pölten run flat?
- Yes. The run climbs 75 m in total, and the engine reads the whole leg as one flat segment. It runs through the baroque old town and into the modern part of the city, with spectators close by.
- What is the swim at IRONMAN 70.3 St. Pölten like?
- A two-lake swim of 1.9 km, laid out so spectators can stand close from the first strokes. The wetsuit decision is not on the organiser's course page, so check it in race week.
- What weather should I expect in St. Pölten in May?
- The organiser recorded highs of 26 C in 2026, 16 C in 2025 and 24 C in 2024. The 2025 edition had a low of 9 C. Heat is not the concern here. A cold start is the one to prepare for.
Course data from the organiser’s published files, analysed 24 Sept 2026 by engine 1, demand model 4. Reference times are simulated for a peer band at a stated reference athlete and are not a prediction for anyone. Nothing on this page is medical advice.
IRONMAN® and IRONMAN 70.3® are registered trademarks, and 5150 is a trademark, of World Triathlon Corporation. Nymiva is an independent training platform and is not affiliated with, sponsored by or endorsed by World Triathlon Corporation. Course data is read from the organiser’s public course pages for the purpose of describing the event.