IRONMAN 70.3 · Krakow · Last raced 2 Aug 2026
How to train for IRONMAN 70.3 Krakow
The organiser calls this bike course rolling, and people hear the word and picture a hill. There is no hill. There are more than twenty little ones, and not one of them lasts a kilometre.
That is the whole story of Kraków. The swim is a quarry, the run is flat, and in between sits a bike that asks the same small question every few minutes for three hours. A Trained reference athlete finishes in 5:55:20, and how they answered that question decides how the last hour feels. The race was last held on 2026-08-02, and the organiser has not yet published the next date.
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 km0 m upCourse file
- Bike88.9 km840 m upCourse file
- Run21.1 km in 3 laps140 m upCourse file
The swim is one pass of Zakrzówek Reservoir, 1.9 km in a former limestone quarry with rock formations around it and water the organiser calls exceptionally clear. They logged it at 23 C in 2025 and have no reading for the two years before.
The bike leaves Kraków for the Lesser Poland countryside, runs out through Wieliczka and Bochnia, and comes back into the city centre, where T2 waits. On a clear day you can see the Tatra Mountains from it. The run is three 7 km loops through the historic streets, then a last stretch to the finish on the Old Town Market Square.
The profile is where the word rolling earns its keep. The engine cuts the bike file into 86 segments. More than twenty of them are rises of 3 percent or steeper, the longest only 868 m. The whole leg stays between 199 m and 279 m above sea level, and 840 m of climbing comes from going up and down inside that band again and again. The run, 140 m in total, reads as one flat stretch for its first 19.4 km.
Course shape by distance
- Flat 85%
- Climbing 8%
- Descending 7%
The longest stretches
- Bike, climbing0.34 km1% of the bike
- Bike, flat4.35 km5% of the bike
- Run, flat19.4 km92% 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 all three legs, and above all on the bike. The demand model scores them at 85 and 82 for the bike and the run and at 85 and 80 for the swim. Threshold capacity follows at 70 everywhere. Because the bike fills more than half of a Trained athlete's day, bike demands take the top eight places in the cross-leg ranking.
Two scores make this course its own. High-intensity capacity reads 58 on the bike against 40 on the run and the swim, and strength and force reads 49 on the bike against 30 on the run. Both come from the rises. Each one is short enough to take with a surge and steep enough to make the surge feel necessary. Ask the engine for a session built from this file and it gives back a dozen efforts of forty-five seconds, well above threshold, each followed by nearly six minutes of easy riding. That is the rhythm of the leg, drawn as a workout.
The third is heat. Environmental resilience scores 60 on every leg here, where a mild course reads 10. The organiser logged highs of 27 C in 2025 and 27 C in 2024, and a low of 13 C that year. A Trained athlete starts the run close to four hours after the gun.
Put the bands beside all this. A Trained athlete swims 38:10, rides 3:07:11 at 182 W and runs 1:59:59. The Competitive band finishes in 5:10:33 from 4.15 W/kg at 75 kg, about 22 minutes quicker on the bike and 18 on the run. It is not quicker because it attacks the rises. It holds 249 W across them and across the flat road between, and then it still has a run.
- Aerobic endurance85
- Muscular endurance80
- Technical skill80
- Threshold capacity70
- Aerobic durability65
- Threshold durability65
- Environmental resilience60
- Fueling resilience55
- High-intensity capacity40
- Anaerobic capacity25
- Strength / force20
- 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 scores twelve dimensions for the course, read from the organiser's file, and the same twelve for the athlete, read from their thresholds and connected training history, each score marked with what it was read from. A dimension counts as a gap only where the course asks more than the athlete can show, and the gaps are weighted by how much of the day they fill. With the bike at more than half the day, a bike gap here outweighs a swim gap of twice the size.
This page carries no one's data. So the season under it takes the plainest assumption, that the gaps sit where the demands are largest, and lays out 24 weeks in 5 developmental blocks and a two-week taper. Aerobic endurance leads the first block in every sport. Threshold work leads the next two on the bike and the run, while the swim moves from threshold capacity to muscular endurance. Muscular endurance takes over the bike and the run in the fourth block, with swim technique beside it, and aerobic endurance returns to lead the last block before the taper. A member's own season starts from their numbers and will disagree with 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%43
- 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 Krakow 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 threshold durability
- Weeks 6 to 9Foundation 2Closes with a recovery week
- PriorityBike threshold durability
- PrioritySwim threshold capacity
- PriorityRun threshold durability
- SupportBike aerobic endurance
- SupportRun aerobic endurance
- SupportSwim aerobic endurance
- SupportBike muscular endurance
- SupportRun muscular endurance
- SupportSwim muscular endurance
- SupportSwim technical skill
- SupportBike threshold capacity
- SupportRun threshold capacity
- Weeks 10 to 13Foundation 3Closes with a recovery week
- PrioritySwim muscular endurance
- PriorityBike threshold capacity
- PriorityRun threshold capacity
- SupportBike aerobic endurance
- SupportRun aerobic endurance
- SupportSwim aerobic endurance
- SupportBike muscular endurance
- SupportRun muscular endurance
- SupportSwim technical skill
- SupportBike threshold durability
- SupportSwim threshold capacity
- SupportRun threshold durability
- Weeks 14 to 17Event shaping 1Closes with a recovery week
- PriorityBike muscular endurance
- PriorityRun muscular endurance
- PrioritySwim technical skill
- SupportBike aerobic endurance
- SupportRun aerobic endurance
- SupportSwim aerobic endurance
- SupportSwim muscular endurance
- SupportBike threshold capacity
- SupportBike threshold durability
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportRun threshold 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 threshold 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
12× rolling-course surges
0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, then 0.8 min at Zone 5, 5.8 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
- 97 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 | 0:45:03 | 3:23:59 | 2:24:18 | 6:43:20 |
| Trained1:51 /100m critical swim speed · 3.03 W/kg at 75 kg · 5:06 /km threshold pace | 0:38:10 | 3:07:11 | 1:59:59 | 5:55:20 |
| Competitive1:36 /100m critical swim speed · 4.15 W/kg at 75 kg · 4:20 /km threshold pace | 0:33:01 | 2:45:35 | 1:41:57 | 5:10:33 |
| Elite1:26 /100m critical swim speed · 5.27 W/kg at 75 kg · 3:50 /km threshold pace | 0:29:34 | 2:31:14 | 1:30:11 | 4:40:59 |
Pacing plan
- 0 km0.4%28.8 km/h6:56
- 3.33 km4.1%14.9 km/h0:42
- 3.51 km0.5%28.4 km/h5:18
- 6.01 km-4.3%51.2 km/h0:44
- 6.64 km0.5%28.4 km/h2:45
- 7.95 km4.2%14.6 km/h0:58
- 8.18 km-0.7%34.3 km/h3:17
- 10.1 km3.2%17.4 km/h1:25
78 more segments in the full plan.
- Run: reach 4:20 /km and this course gives back 44:47.
Where it is decided
Nowhere in particular, and that is the problem.
Most courses give you a place. Kraków gives you a pattern. The steepest ramp on the bike, 344 m at 8.1 percent near kilometre 19, takes 1.4 percent of the leg. The longest unbroken flat stretch takes less than 5 percent. No single piece of this course is worth fighting over, which means every piece gets fought over by somebody. A rider who stands up for each rise has gone above threshold twenty times before the road turns back for the city, and the average power afterwards will look innocent.
The bill is paid on the run. The engine reads 92 percent of the run leg as one flat segment, and flat is exactly where tired legs have nowhere to hide. A Trained runner needs 1:59:59 from an input of 5:06 /km threshold pace, 3 laps of the same streets, four hours into the day. The athlete who rode 182 W over every rise and every flat reaches the Old Town Market Square running. The one who surged arrives walking the last loop.
Getting it wrong
Training for a hilly race. Rolling reads as climbing, so people spend the spring on long climbs and arrive with power they never get to use. Strength and force scores 49 on the bike, a long way behind aerobic endurance at 85. What this course rewards is holding steady power through constant small changes of gradient, and a long hill does not teach that.
Riding the descents as rest. There are about as many short drops as rises, and a rider who freewheels every one of them and then surges the next ramp to win the time back ends up with a leg of intervals and no steady riding at all.
Pacing the run for spring. The organiser's highs sit at 27 C in two of the last three editions, and a Trained athlete is four hours into the day before the first loop starts. Run the first 7 km at the pace the day allows, not the pace you rehearsed.
Conditions on the day
- 2025high 27 C, low 15 Cwater 23 C
- 2024high 27 C, low 13 C
- 2023high 25 C, low 15 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 Krakow 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
- 5:55:20
- 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 Krakow bike course?
- Rolling. The organiser's file climbs 840 m, spread over more than twenty short rises of 3 percent or steeper, and the longest of them is 868 m at 4 percent. The steepest is 344 m at 8.1 percent, near kilometre 19. There is no long climb anywhere on it.
- What is the water like at Zakrzówek Reservoir?
- It is a former limestone quarry, which the organiser describes as exceptionally clear and ringed by rock formations. The water was 23 C in 2025, the only year the organiser records. The wetsuit decision is not on the course page, so check it in race week.
- Is the IRONMAN 70.3 Krakow run flat?
- Yes. The organiser calls it flat, and the engine reads the first 19.4 km as one flat stretch. It is three 7 km loops through the historic streets and a final stretch to the Old Town Market Square.
- When is the next IRONMAN 70.3 Krakow?
- The organiser has not yet published the next date. The course, the conditions and the season on this page stand on their own, and the illustrative season runs 24 weeks.
Course data from the organiser’s published files, analysed 25 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.