IRONMAN 70.3 · Jesolo · 24 Apr 2027
How to train for IRONMAN 70.3 Venice-Jesolo
Jesolo is sold by its organiser as the fastest course in Europe, and the profile does not argue. An easy Adriatic swim, a bike with no climb at all, a run beside the beach. So people come here to chase a personal best and train for speed. What the course actually asks for is harder to train and much less exciting: one steady effort, held for three hours, with nothing on the road to warn you when it has become too much.
Read the file. 149 m of gain across 89.8 km of road, and the engine cannot find a single segment worth splitting off. A Trained athlete's 5:42:12 is decided by the number held from the lagoon to Eraclea and back, and by what that number leaves for the run.
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 km2 m upCourse file
- Bike89.8 km149 m upCourse file
- Run20.9 km63 m upCourse file
The swim is one counterclockwise loop of the Adriatic, 1.9 km from the beach in front of the lighthouse that marks the border between Jesolo and Cavallino. The organiser logged the water at 17 C in 2026 and 19 C the year before. Out of the sea you run 250 m and cross a bridge before transition even begins, and T1 itself, on Viale Gorizia/Udine, is about 300 m long.
The bike is one loop of 89.8 km on long straight roads. It sets off beside the Venetian lagoon toward Cavallino, comes back through Jesolo to Cortellazzo and its bridge of boats, and carries on to Eraclea and its canals before turning for home in the same direction it came.
Three 7 km loops make the run. A shady avenue, a right turn onto the promenade on the lighthouse beach, a turnaround, and back again. After the third lap a footpath takes you off the loop to the finish line on the sand.
That is 214 m of climbing in 113 km, and the engine's reading of where the time goes has almost nothing to say. The bike is one flat segment carrying more than 99 percent of the leg. The run is one flat segment carrying all of it.
Course shape by distance
- Flat 100%
- Climbing 0%
- Descending 0%
The longest stretches
- Bike, flat89.8 km100% of the bike
- Run, flat20.9 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, then muscular endurance, and that order holds on every leg. Threshold capacity sits third on the bike and on the run, with aerobic durability and threshold durability level behind it. Because the bike fills 51 percent of a Trained athlete's day, the five largest demands on the course all belong to the bike, and the run's aerobic endurance only arrives in sixth.
The swim breaks the pattern. Technical skill ranks third there, ahead of threshold capacity, and it falls a long way down the list on land. At the other end, strength and sprint power sit near the bottom for the bike. Nothing on this road pays you for a jump.
Now the bands. A Trained athlete swims 38:10, rides 2:55:39 at 182 W and runs 1:58:23, for 5:42:12. The Competitive band finishes in 4:58:59, riding 2:35:23 at 249 W from 4.15 W/kg at 75 kg and running 1:40:35. Neither of those days contains a hard minute. They differ in how high the one steady number sits, and in whether it survives until the footpath to the beach.
- Aerobic endurance85
- Muscular endurance80
- Technical skill73
- Threshold capacity70
- Aerobic durability65
- Threshold durability65
- Fueling resilience55
- 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
Nymiva puts the course and the athlete on one scale. The twelve dimensions scored above for Jesolo are scored again for you, from your thresholds and your connected training history, and every score carries a note on what it was read from. A gap exists only where the course asks for more than you can show. Gaps are then weighted by the share of the day they fill, and here that share is lopsided: the bike is 51 percent of a Trained day and the swim 11 percent.
Nobody's numbers sit behind this page. The season below takes the plainest assumption on offer, that the gaps fall where the demands are largest, and lays out 24 weeks in 5 developmental blocks before a taper. Aerobic endurance leads the first block in all three sports. The second hands the swim to threshold capacity and the bike and run to aerobic durability. In the third, technical skill leads the swim while threshold capacity leads the other two. Muscular endurance takes over everywhere in the fourth, and aerobic endurance comes back for the last. A member's season is built from their own data 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, 51% of the day85 × 51%44
- 02Muscular enduranceBike leg, 51% of the day80 × 51%41
- 03Threshold capacityBike leg, 51% of the day70 × 51%36
The bike takes 51% 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 Venice-Jesolo 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
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportBike aerobic durability
- SupportRun aerobic durability
- Weeks 6 to 9Foundation 2Closes with a recovery week
- PrioritySwim threshold capacity
- PriorityBike aerobic durability
- 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 capacity
- SupportRun threshold capacity
- Weeks 10 to 13Foundation 3Closes with a recovery week
- PrioritySwim technical skill
- PriorityBike threshold capacity
- PriorityRun threshold capacity
- SupportBike aerobic endurance
- SupportRun aerobic endurance
- SupportSwim aerobic endurance
- SupportBike muscular endurance
- SupportRun muscular endurance
- SupportSwim muscular endurance
- SupportSwim threshold capacity
- SupportBike aerobic durability
- 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
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportBike aerobic durability
- 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
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportBike aerobic durability
- 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
Sustained course race pressure
60 min at Zone 4
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
- 85 min
- Trains threshold durability
- Supports aerobic durability
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 | 3:10:40 | 2:22:22 | 6:28:05 |
| Trained1:51 /100m critical swim speed · 3.03 W/kg at 75 kg · 5:06 /km threshold pace | 0:38:10 | 2:55:39 | 1:58:23 | 5:42:12 |
| Competitive1:36 /100m critical swim speed · 4.15 W/kg at 75 kg · 4:20 /km threshold pace | 0:33:01 | 2:35:23 | 1:40:35 | 4:58:59 |
| Elite1:26 /100m critical swim speed · 5.27 W/kg at 75 kg · 3:50 /km threshold pace | 0:29:34 | 2:21:54 | 1:28:59 | 4:30:27 |
Pacing plan
- 0 km0%30.8 km/h2:54:54
- Run: reach 4:20 /km and this course gives back 43:13.
Where it is decided
In the second hour of the bike, on road that looks exactly like the first hour.
A Trained athlete spends 2:55:39 out there at 182 W, and the road never forces a change. No climb pushes the power up. No descent lets it fall. On long straight roads the number on your head unit is the only feedback you get, and it drifts upward when you feel good and nobody is watching. Ask the engine for a session built from this file and it returns sixty minutes of continuous Zone 4 inside an 85 minute ride. No repeats, no surges. That is the leg, honestly described: one sustained pressure, held without negotiation.
The run is where you find out whether you held it. Three laps of the same avenue and the same promenade, 1:58:23 for a Trained athlete from an input of 5:06 /km threshold pace. The Competitive band's 1:40:35 is not a different kind of running. It is the same flat loop, run off a bike that cost what it was supposed to cost and no more.
Getting it wrong
The first mistake happens on foot. From the water it is 250 m and a bridge to T1, then a transition about 300 m long, and athletes reach the bike breathing hard and ride the first kilometres beside the lagoon at whatever their heart rate dictates. The power they set in that state is not the power they planned, and on this course nothing later corrects it.
The second is taking the organiser at its word. The fastest course in Europe invites a bike split target, and riders who chase one ride Cortellazzo to Eraclea as if the run were optional. It is not, and on a course with this little terrain the bike leaves nowhere to hide an overspend. It all shows up on the promenade.
The third is the calendar. This race falls in late April, and the 2024 edition reached a high of only 13 C, with a low of 7 C and water at 17 C. Three hours on the bike after a swim in that water is a long time in kit chosen for the forecast high. Plan the bike around the low.
Conditions on the day
- 2026high 19 C, low 9 Cwater 17 C
- 2025high 22 C, low 13 Cwater 19 C
- 2024high 13 C, low 7 Cwater 17 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 Venice-Jesolo 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
- 5:42:12
- Of the day on the bike
- 51%
- Dimensions scored per leg
- 12
- Season runway shown
- 24 wk
Questions people ask
- Is the IRONMAN 70.3 Venice-Jesolo bike course flat?
- Completely. The organiser describes a single 90 km loop with no climb at all, and the file they publish measures 149 m of gain. It runs beside the Venetian lagoon to Cavallino, back through Jesolo to Cortellazzo and its bridge of boats, on to Eraclea, then home the way it came.
- What is the water temperature for the swim at Jesolo?
- The organiser logged 17 C in 2026 and 19 C in 2025. It is one counterclockwise loop of the Adriatic from the beach in front of the lighthouse. The wetsuit decision is not on the organiser's course page, so check it in race week.
- How many loops is the IRONMAN 70.3 Venice-Jesolo run?
- Three 7 km loops. Each one takes a shady avenue, turns right onto the promenade on the lighthouse beach and reaches a turnaround. After the third lap a footpath leads to the finish line on the beach.
- How long is the season on this page?
- The illustrative season runs 24 weeks, with five developmental blocks and a taper. It is built from the course alone. A member's season starts from their own numbers and can run 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.