IRONMAN 70.3 · Omaha · 6 Jun 2027
How to train for IRONMAN 70.3 Omaha
Omaha is new. The race made its debut in 2026, so nobody arrives with years of local lore, and most people read the organiser's summary and prepare for hills. The hills are real. They are also split in two, with 20 km of flat road between them, and that flat road is where most riders set up their own trouble.
A Trained athlete finishes in 5:56:43 here. More than half of it is the bike, and the bike rewards the rider who treats every part of it the same way, hills and flats alike.
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.
- Swim1.89 km2 m upCourse file
- Bike90.1 km708 m upCourse file
- Run21.4 km in 2 laps93 m upCourse file
You start in Lake Cunningham, a 390-acre reservoir that is closed to swimmers for the rest of the year. The swim is a single loop of 1.9 km, in and out near the boat ramp, with spectators walking the trail that circles the lake. The organiser publishes no water temperature for any year.
From transition at the lake the bike heads into Douglas County farmland, 90.1 km and 708 m of climbing. The organiser describes challenging climbs and fast descents, and the file agrees. The first 25 km carry ten rises of 3 percent or steeper. Then the road levels out for almost 20 km. From kilometre 44 the rolling starts again with thirteen more rises, the steepest of them 379 m at 7.4 percent near kilometre 74. The last 15 km drop gently and then flatten into the City of Omaha, finishing near the Missouri River.
The run is the organiser's showpiece. 2 laps on paved trails along the Missouri River, over the Bob Kerrey Pedestrian Bridge into Council Bluffs, past Tom Hanafan River's Edge Park and back across to finish near downtown. You cross a state line four times. The file measures 93 m of gain, and apart from a few short ramps of about 4 percent the engine reads it as flat.
Course shape by distance
- Flat 85%
- Climbing 7%
- Descending 7%
The longest stretches
- Bike, flat19.9 km20% of the bike
- Bike, climbing0.38 km1% of the bike
- Run, flat6.46 km30% 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 first, muscular endurance a close second, and on the bike above all. The demand model scores those two at 85 and 82 for the bike leg, with threshold capacity at 70 and threshold durability at 68. The bike fills 52 percent of a Trained athlete's day, so the seven largest demands in the cross-leg ranking all belong to it.
Two scores set Omaha apart from a flat race. High-intensity capacity reads 58 on the bike against 42 on the run, because 23 short ramps each invite a hard half minute. Environmental resilience reads 60 on every leg. The organiser logged a high of 32 C at the first edition in 2026, with 26 C and 28 C in its table for the two years before, and the demand model has taken that seriously.
The bike turns into a clear session when the engine compiles it: a dozen efforts of about 45 seconds in Zone 5, each followed by roughly four minutes of easy spinning. That is the rhythm of the two hilly sections, compressed into a little over an hour.
Look at the bands next to it. A Trained athlete swims 38:04, rides 3:07:01 at 182 W and runs 2:01:38. Of that ride, around 37 minutes are spent climbing. The Competitive band finishes in 5:11:42 from 4.15 W/kg at 75 kg and 4:20 /km threshold pace, about 22 minutes quicker on the bike and 18 quicker on the run. The difference is a higher steady number over three hours, not a harder attack on any single ramp.
- Aerobic endurance85
- Muscular endurance80
- Threshold capacity70
- Technical skill67
- 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
At the start of every Nymiva plan, two readings sit side by side. The course gets twelve demand scores from its file. The athlete gets the same twelve from thresholds and connected training history, each labelled with what it came from and how reliable it is. Only where the course asks for more than the athlete can show is there a gap, and those gaps are ranked by the share of race time they touch.
Nobody's data sits behind this page, so its season makes the plainest assumption available: your gaps are where the demands are biggest. On that basis it lays out 24 weeks in 5 developmental blocks and a two-week taper. Aerobic endurance leads the opening block in all three sports. The second block puts threshold durability first on the bike and the run, and technical skill first in the water. Threshold capacity and muscular endurance lead the next two, and aerobic endurance returns before the taper. A member's season comes from their own numbers and will read differently.
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, 52% of the day85 × 52%45
- 02Muscular enduranceBike leg, 52% of the day82 × 52%43
- 03Threshold capacityBike leg, 52% of the day70 × 52%37
The bike takes 52% 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 Omaha 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
- SupportSwim technical skill
- SupportRun threshold durability
- Weeks 6 to 9Foundation 2Closes with a recovery week
- PriorityBike threshold durability
- PrioritySwim technical skill
- PriorityRun threshold 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
- SupportSwim technical skill
- SupportRun threshold 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
- SupportSwim technical skill
- 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
- SupportBike threshold capacity
- SupportRun threshold capacity
- SupportSwim threshold capacity
- SupportBike threshold durability
- SupportSwim technical skill
- 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, 4 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
- 78 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 | 0:44:55 | 3:26:33 | 2:26:17 | 6:47:45 |
| Trained1:51 /100m critical swim speed · 3.03 W/kg at 75 kg · 5:06 /km threshold pace | 0:38:04 | 3:07:01 | 2:01:38 | 5:56:43 |
| Competitive1:36 /100m critical swim speed · 4.15 W/kg at 75 kg · 4:20 /km threshold pace | 0:32:55 | 2:45:26 | 1:43:21 | 5:11:42 |
| Elite1:26 /100m critical swim speed · 5.27 W/kg at 75 kg · 3:50 /km threshold pace | 0:29:30 | 2:31:05 | 1:31:25 | 4:42:00 |
Pacing plan
- 0 km-1.5%38.2 km/h0:32
- 0.34 km-3%45.4 km/h0:13
- 0.5 km-0.7%34.3 km/h0:47
- 0.96 km5.6%11.8 km/h3:33
- 1.65 km-5%54.1 km/h0:26
- 2.05 km-0.8%34.8 km/h0:41
- 2.45 km-3.7%48.5 km/h0:22
- 2.75 km1.3%24.6 km/h1:56
82 more segments in the full plan.
- Run: reach 4:20 /km and this course gives back 45:01.
Where it is decided
On the flat middle of the bike, between kilometre 25 and kilometre 44.
This stretch is the largest single block of time on the course, 20 percent of the bike leg. It arrives right after ten climbs, when your legs have warmed up and your average speed looks disappointing. Flat road feels like the place to fix that. Riders drop their heads, push well past 182 W, and watch the speed come back.
The bill arrives at kilometre 44. Thirteen more climbs are waiting, including the 7.4 percent ramp near kilometre 74, and every one of them is steeper when you reach it already fatigued. The steepest climb takes only 1.4 percent of the bike leg. It still decides a lot of runs, because by then the riders who spent the flat have nothing left for it.
The run exposes whatever the bike left behind. Its longest flat stretch covers about 30 percent of the leg, and a runner holding the Trained band's 2:01:38 needs even pacing along the river more than anything else. A run in 32 C with a second crossing of the bridge still to come is no place to discover you rode the middle too hard.
Getting it wrong
The classic error is riding the first hills like a warm-up and the flat like a time trial, and it is covered above. There are two others.
One is training for a hilly race. Strength and force score only 48 on the bike and 36 on the run, well behind aerobic endurance. Omaha's climbs are short, most under 400 m, and they reward riders who can climb at steady power and recover on the next descent. Long seated efforts across rolling terrain prepare you better than steep repeats do.
The other is the heat. The first edition reached 32 C. The run is two laps with a bridge crossing out and back on each, and the second lap is where heat that was ignored on the first comes due. Council Bluffs is a long way from the finish when you are walking.
Conditions on the day
- 2026high 32 C, low 21 C
- 2025high 26 C, low 16 C
- 2024high 28 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 Omaha 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
- 5:56:43
- Of the day on the bike
- 52%
- Dimensions scored per leg
- 12
- Season runway shown
- 24 wk
Questions people ask
- How hilly is the IRONMAN 70.3 Omaha bike course?
- Rolling. The organiser promises challenging climbs and fast descents through Douglas County, and the file measures 708 m of gain over 90 km. The steepest sustained ramp is 379 m at 7.4 percent near kilometre 74, and there are 23 rises of 3 percent or steeper in all.
- Where is the IRONMAN 70.3 Omaha swim?
- Lake Cunningham, a 390-acre reservoir that is not open to general swimming during the year. It is a single loop, entering and exiting near the boat ramp, and spectators can follow from the trail around the lake.
- Does the IRONMAN 70.3 Omaha run really cross into Iowa?
- Yes. The two-lap run follows paved trails along the Missouri River, crosses the Bob Kerrey Pedestrian Bridge into Council Bluffs, passes Tom Hanafan River's Edge Park and comes back over the bridge to finish near downtown Omaha.
- What water temperature should I expect at Lake Cunningham?
- The organiser has not published one. Its weather table has no water reading for 2024, 2025 or 2026, so the wetsuit question waits for the athlete guide.
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.