IRONMAN 70.3 · St. Kilda · 8 Nov 2026
How to train for IRONMAN 70.3 Melbourne
The organiser's pitch is honest. Melbourne is flat and fast, a course to chase a personal best on, with the race village in Catani Gardens and views of the Melbourne CBD from the run. Athletes hear "flat and fast" and translate it as "easy". It is the opposite. A flat course is the one place in triathlon where you never get to stop working.
The engine reads this bike as one segment. Two laps, one segment: 90.3 km of Beach Road with no climb, no descent and no change of gradient worth separating out. A Trained athlete spends 2:59:38 on it at 182 W, pedalling the whole way, and then runs 21.5 km of waterfront that the engine reads the same way. There is nowhere on this course to recover except the course itself.
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
- Bike90.3 km in 2 laps301 m upCourse file
- Run21.5 km in 2 laps30 m upCourse file
The swim starts in front of the St Kilda Sea Baths with a rolling start into Port Phillip Bay. The organiser's route goes 100 m west, left toward St Kilda Marina, right to swim west, right again to head north under the new St Kilda Pier, and a last right into the finish chute in front of Catani Gardens. That is four turns in 1.9 km, and spectators can watch from the pier as you pass beneath it.
The bike is 2 laps of Beach Road. You leave T1 heading north briefly, then turn south along the coast past Half Moon Bay and the southern point of Beaumaris, turn around just before the Mordialloc Life Saving Club, and ride back to St Kilda to turn again just north of Catani Gardens. The file measures 301 m of climbing over both laps, spread so thinly that not one stretch of it registers as a climb.
The run is 2 laps clockwise along the St Kilda and Elwood waterfront, out along the Bay Trail to a turnaround just past Elwood Beach and back to Catani Gardens. On the second lap you turn left twice and run down the palm tree lined finish line. The whole run climbs 30 m.
Course shape by distance
- Flat 100%
- Climbing 0%
- Descending 0%
The longest stretches
- Bike, flat90.3 km98% of the bike
- Run, flat21.5 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 scores 85 on every leg, and muscular endurance sits right behind it, 81 on the bike and 80 on the run. Those are the demands of three hours in one position at one effort. The bike fills 51 percent of a Trained athlete's day, so five of the six largest demands on the course are bike demands, with the run's aerobic endurance the only one to break in.
The more interesting number is on the swim. Technical skill scores 74 there, higher than the swim's threshold capacity, against 39 on the bike. Four turns in open water, a pier to pass under and a crowd above it make the swim the only leg of the day that asks you to think about anything except effort.
What the course does not ask is just as telling. High-intensity capacity reads 40 on every leg and strength and force reads 35 on the bike. Nothing here rewards a surge. Everything here punishes one.
The bands carry the rest. A Trained athlete swims 38:14, rides 2:59:38 and runs 2:01:55, for 5:49:47. The Competitive band finishes in 5:05:34, riding 2:38:55 at 249 W and running 1:43:35 from 4:20 /km threshold pace. With no terrain in the file, every second of that difference is a number held for longer. Nobody gains time on a Beach Road descent, because there is none.
- Aerobic endurance85
- Muscular endurance80
- Technical skill74
- 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 measures both sides of the same scale. The course gets its twelve scores from the files. The athlete gets twelve matching scores from their thresholds and connected training, each one tagged with its source and a confidence. A dimension becomes a gap only where the course outscores the athlete, and a gap counts for as much of the day as its leg fills. That is why a bike gap on this course weighs about five times a swim gap of the same size.
Nothing about the reader is on this page. The season shown here therefore makes one assumption, that the reader's gaps sit where Melbourne's demands peak, and builds 24 weeks from it: 5 developmental blocks and a two-week taper. Aerobic endurance leads the first block in every sport. The middle blocks split by sport, with the swim led by threshold capacity and then technical skill while the bike and run work through aerobic durability and threshold capacity. Muscular endurance leads the fourth block and aerobic endurance leads the last. A member's season starts from their own numbers instead.
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 day81 × 51%42
- 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 Melbourne 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 | 0:45:07 | 3:14:59 | 2:26:37 | 6:36:43 |
| Trained1:51 /100m critical swim speed · 3.03 W/kg at 75 kg · 5:06 /km threshold pace | 0:38:14 | 2:59:38 | 2:01:55 | 5:49:47 |
| Competitive1:36 /100m critical swim speed · 4.15 W/kg at 75 kg · 4:20 /km threshold pace | 0:33:04 | 2:38:55 | 1:43:35 | 5:05:34 |
| Elite1:26 /100m critical swim speed · 5.27 W/kg at 75 kg · 3:50 /km threshold pace | 0:29:37 | 2:25:08 | 1:31:38 | 4:36:23 |
Pacing plan
- 0 km0%30.8 km/h2:55:59
- Run: reach 4:20 /km and this course gives back 44:13.
Where it is decided
On the second lap of the bike, heading south past Half Moon Bay for the second time.
The engine names the whole bike as the decisive stretch, 98 percent of the leg in one flat segment, and the whole run as the other. That is the course telling you there is no single moment to plan for. Ask it for a session from this bike file and it gives back one continuous hour in Zone 4, a warm-up and a cool-down, and nothing else. No intervals, no rest. That hour is the closest rehearsal of Beach Road you can do.
By the second trip to Mordialloc the fresh legs are gone and the power drifts. Nothing on the road tells you it is happening. There is no hill to show you, no descent to cover it. A Trained athlete who holds 182 W all the way back to Catani Gardens starts the run on pace. One who let it slide will not notice until the Bay Trail, and then the flat 21.5 km becomes the longest part of the day.
Getting it wrong
Racing the first lap. The field is fresh, Beach Road is fast, and the crowd at St Kilda sends you out hot. Every watt above your plan on lap one is borrowed from lap two, and on a course this even the loan comes due on schedule.
Sprinting out of the turnarounds. The course turns around before the Mordialloc Life Saving Club on each lap and again north of Catani Gardens, and every U-turn tempts a surge to get back up to speed. A few hard accelerations will not ruin a day. The habit of them, repeated at every turn, eats the run.
Trusting the forecast average. The organiser's three logged editions ran from a high of 15 C to 32 C, and the water from 17 C to 20 C. The engine scores environmental resilience at 10 on every leg, and in a mild year that is right. In 2023 it was not, and a run along the waterfront at 32 C is a different race from the one you trained for.
Conditions on the day
- 2025high 15 C, low 10 C
- 2024high 21 C, low 10 Cwater 17 C
- 2023high 32 C, low 15 Cwater 20 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 Melbourne 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
- 5:49:47
- 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 Melbourne course flat?
- Yes. The organiser calls it flat and fast, and the course files agree. The bike is two laps of Beach Road between St Kilda and a turnaround before the Mordialloc Life Saving Club, and the engine reads the whole bike and the whole run as a single flat segment each. The bike file measures 301 m of climbing over both laps, in rises too small to count as climbs.
- How warm is the water in Port Phillip Bay?
- The organiser expects around 18 C at this time of year and a swim that is likely to be wetsuit-optional. It logged 17 C in 2024 and 20 C in 2023. Check the final wetsuit call in race week.
- How many laps is the IRONMAN 70.3 Melbourne run?
- Two clockwise laps along the St Kilda and Elwood waterfront, out to a turnaround just past Elwood Beach and back to Catani Gardens. On the second lap you turn left twice for the palm tree lined finish line.
- How hot does IRONMAN 70.3 Melbourne get?
- It varies more than the course does. The organiser logged a high of 15 C in 2025, 21 C in 2024 and 32 C in 2023. Prepare for the whole range, not the average.
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.