IRONMAN 70.3 · Jonkoping · 11 Jul 2027
How to train for IRONMAN 70.3 Jonkoping
Expect fast times, the organiser says, and then in the same breath warns you not to underestimate the climbs. Most people hear only the first half. They see a race in Småland with a flat run and a bike tagged rolling, and they plan a quick day on quiet roads.
The file has more to say. The bike climbs 814 m in a single loop of 90 km, and it does so in 25 separate climbs of 3 percent or steeper, with 24 descents of the same order between them. None of them is long. The longest is 2 km. What decides the race is how many there are, and where half of them sit.
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 kmDistance only
- Bike90 km814 m upCourse file
- Run21.1 km165 m upCourse file
A cannon starts the day. The swim is one loop of 1.9 km in lake Munksjön, an out-and-back the organiser calls easy: swim out, take two turns to the left, come back. From the swim exit you run to transition at Östra torget in central Jönköping, far enough that the organiser offers an optional bag with a spare pair of shoes for the trip.
The bike heads out through the lakes and villages around Jönköping, and the organiser's description has you passing lakes and forests along Lake Vättern. The run is two loops through the centre of Jönköping and around Munksjön, 21.1 km and 165 m of climbing in the file. The town hosted the 2025 European Championship of this series.
The bike profile is not rolling in the gentle sense. The first 28 km hold 12 of the 25 climbs and 10 of the descents, including the longest climb, 2 km at 5.1 percent from kilometre 7, and the steepest, 203 m at 8.4 percent at kilometre 14. Then comes the longest flat stretch of the ride, 10.6 km from kilometre 28. After that the pattern repeats in smaller doses, a cluster of rises, a flat stretch, another cluster, until a flat 6.3 km from kilometre 80 and one last short rise before transition. The run is quieter: two rises of about 440 m at 2.5 percent, at kilometres 4 and 13, and a short 3.6 percent kick near the end.
Course shape by distance
- Flat 85%
- Climbing 8%
- Descending 7%
The longest stretches
- Bike, climbing0.2 km1% of the bike
- Run, flat8.79 km41% of the run
- Run, flat5.37 km25% 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.
More than the word fast suggests. The demand model puts aerobic endurance at 85 and muscular endurance at 82 on the bike and the run, with threshold capacity at 70 on every leg. Weighted by time the bike owns the top seven places in the ranking, because it fills 53 percent of a Trained athlete's day.
Two bike scores tell you what kind of course this is. High-intensity capacity reads 58 on the bike, against 42 on the run and 40 on the swim. Strength and force reads 49 on the bike and 36 on the run. Those are the 25 climbs speaking. Give the engine this bike file and ask for a session, and it hands back a dozen 45-second surges in Zone 5, each followed by 2 minutes 45 seconds of easy spinning, on the thesis that the course keeps changing gradient and the surge is its basic unit.
The bands fill in the rest. A Trained athlete swims 38:12, rides 3:08:53 at 182 W and runs 1:59:46, for 5:56:51. The Competitive band finishes in 5:11:54 from 4.15 W/kg at 75 kg. It is about 22 minutes quicker on the bike and 18 on the run, and none of that comes from surging harder. It comes from riding 249 W over the climbs as well as between them.
July in Jönköping is mild by day and cool overnight. The organiser logged highs of 25 C in 2026 and 20 C in 2025, lows of 9 C in both years, and the lake at 18 C in 2025.
- Aerobic endurance85
- Muscular endurance80
- Threshold capacity70
- Aerobic durability65
- Threshold durability65
- Fueling resilience55
- Technical skill55
- High-intensity capacity40
- Anaerobic capacity25
- Strength / force20
- Environmental resilience15
- 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
On the other side of every demand on this page sits a score for the athlete, on the same twelve dimensions. The course's scores come from the organiser's files, where there are files. The athlete's come from thresholds and connected training history, each with a note on its source and on how firmly it stands. A dimension is a gap only where the course asks for more than the athlete can show, and gaps are ranked by the share of the day they fill. On a course where the bike is more than half the day, bike gaps go to the front of the queue.
This page has no athlete, so it knows no gaps. Its season takes the plainest assumption, that the gaps fall where the demands are biggest, and lays out 24 weeks as 5 developmental blocks and a two-week taper. Aerobic endurance leads the first and the last block in every sport. The second block puts threshold durability at the front for the bike and the run, and aerobic durability for the swim. Threshold capacity leads the third and muscular endurance the fourth. A member's season comes from their own numbers, and it 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%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 Jonkoping 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
- SupportBike threshold capacity
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportBike threshold durability
- SupportRun threshold durability
- SupportSwim aerobic durability
- Weeks 6 to 9Foundation 2Closes with a recovery week
- PriorityBike threshold durability
- PriorityRun threshold durability
- PrioritySwim aerobic durability
- SupportBike aerobic endurance
- SupportRun aerobic endurance
- SupportSwim aerobic endurance
- SupportBike muscular endurance
- SupportRun muscular endurance
- SupportSwim muscular endurance
- SupportBike threshold capacity
- SupportRun threshold capacity
- SupportSwim threshold capacity
- Weeks 10 to 13Foundation 3Closes with a recovery week
- PriorityBike threshold capacity
- PriorityRun threshold capacity
- PrioritySwim threshold capacity
- SupportBike aerobic endurance
- SupportRun aerobic endurance
- SupportSwim aerobic endurance
- SupportBike muscular endurance
- SupportRun muscular endurance
- SupportSwim muscular endurance
- SupportBike threshold durability
- SupportRun threshold durability
- SupportSwim 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
- SupportBike threshold capacity
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportBike threshold durability
- SupportRun threshold durability
- SupportSwim 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
- SupportBike threshold capacity
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportBike threshold durability
- SupportRun threshold durability
- SupportSwim 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
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, 2.8 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
- 64 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 | 0:45:05 | 3:27:18 | 2:24:02 | 6:46:25 |
| Trained1:51 /100m critical swim speed · 3.03 W/kg at 75 kg · 5:06 /km threshold pace | 0:38:12 | 3:08:53 | 1:59:46 | 5:56:51 |
| Competitive1:36 /100m critical swim speed · 4.15 W/kg at 75 kg · 4:20 /km threshold pace | 0:33:03 | 2:47:05 | 1:41:46 | 5:11:54 |
| Elite1:26 /100m critical swim speed · 5.27 W/kg at 75 kg · 3:50 /km threshold pace | 0:29:36 | 2:32:36 | 1:30:01 | 4:42:13 |
Pacing plan
- 0 km0.8%26.9 km/h7:50
- 3.52 km-3.8%49 km/h0:11
- 3.67 km-0.5%33.3 km/h6:15
- 7.14 km5.1%12.7 km/h9:20
- 9.11 km0%30.8 km/h0:23
- 9.31 km7.6%9.2 km/h1:02
- 9.46 km0%30.8 km/h0:18
- 9.62 km7.1%9.7 km/h1:23
81 more segments in the full plan.
- Run: reach 4:20 /km and this course gives back 44:57.
Where it is decided
In the first 28 km of the bike, while everything still feels easy.
This is where the course is busiest and the rider is freshest, which is the worst combination on the day. Twelve climbs, ten descents, the longest ramp and the steepest one, all inside the first hour or so for a Trained rider. None of them costs much time. The 8.4 percent pitch takes 0.9 percent of the bike leg. That is exactly why they cost so much power: each one is over before it hurts, so riders stand up on every one of them. Twelve surges in the first hour is the session the engine prescribes for training, not the plan for race day.
Then the road hands you 10.6 km of flat, and a rider who has been surging uses it to recover rather than to ride. The rest of the loop keeps offering the same trade, a few rises, a flat stretch, a few more.
The run shows the result. Two flat stretches carry 41 and 25 percent of the run leg, and on them a Trained athlete from an input of 5:06 /km threshold pace either holds pace or does not. There are no hills to explain it away. The two 2.5 percent rises are gentle, and a runner who rode the first 28 km at 182 W barely notices them.
Getting it wrong
The first mistake is believing the headline. Fast times come to riders who meter the climbs, and the 25 climbs are the part of the organiser's sentence people skip.
The second is the swim exit. The run to Östra torget is long enough for the organiser to offer a spare pair of shoes. Treat it as part of the race and not a sprint to the bike, because the first 28 km are waiting at the end of it.
The third is the morning. Lows of 9 C in 2025 and 9 C in 2026, a lake at 18 C, and then the busiest stretch of the bike straight after. Riders who start the bike cold ride the first climbs harder to warm up, which is the one habit this course punishes most.
Conditions on the day
- 2026high 25 C, low 9 C
- 2025high 20 C, low 9 Cwater 18 C
- 2024high 22 C, low 13 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 Jonkoping 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
- 5:56:51
- 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 Jonkoping bike course?
- The organiser calls it rolling and warns riders not to underestimate the climbs. Its file measures 814 m of climbing over one 90 km loop, with 25 climbs and 24 descents of 3 percent or steeper. The longest climb is 2 km at 5.1 percent from kilometre 7, and the steepest is 203 m at 8.4 percent.
- Where is the swim at IRONMAN 70.3 Jonkoping?
- In lake Munksjön, one loop on what the organiser calls an easy out-and-back layout, with two turns to the left before you head back. The organiser publishes no swim file, and it logged the water at 18 C in 2025. Transition is at Östra torget in central Jönköping.
- Is the IRONMAN 70.3 Jonkoping run flat?
- Mostly. The organiser calls it flat, and its file measures 165 m of climbing over two loops through the centre of Jönköping and around Munksjön. The steepest rise is 193 m at 3.6 percent, close to the finish.
- How long is the season built on this page?
- It runs 24 weeks, with five developmental blocks and then a two-week taper. The course is its only input. A member's season takes their own numbers as its starting point and can be longer.
Course data from the organiser’s published files, analysed 23 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 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.