When is the 2027 Chtriman?

On Sunday 27 June 2027 in Gravelines for the 226 (7 am start), the Swim Bike L (8 am), the duathlon (9 am) and the 113 (from 11:30 am); on Saturday 26 June for the S, XS and youth races.

When does registration open for the 2027 Chtriman?

The long distances have been open since Monday 14 September 2026 at 8 pm, on Prolivesport. As of 17 October 2026, 110 places were left on the 226 and 12 on the 113. The S and XS open in December 2026, the youth races on Saturday 3 April 2027 at 10 am.

How much is the Chtriman 226?

€240 until 30 November 2026, €260 from 1 December to 28 February 2027, then €280 until 13 June 2027. Without an FFTri licence, add the €40 day licence.

Is the Chtriman an IRONMAN race?

The 226 covers the full distance (3.8 km swim, 180 km bike, 42 km run), but it is not an IRONMAN-branded race: it is organised in Gravelines by the Chtriman team, under the French Triathlon Federation, whose rules apply.

Is the Chtriman bike course hilly?

No: it is a 90 km loop in the Flemish countryside, with no notable climb published by the organisers.

Chtriman Gravelines: how many weeks of preparation?

For an athlete at intermediate level, Endu builds a 25-week preparation. If your race is closer, the plan compresses phases while keeping the taper; if it's further away, it lengthens the preparation, and when the gap is large the preparation starts right away, gently and at your current volume, before building up.

How many sessions per week?

This example has 7 sessions per week. You choose 6 to 7 training days and the exact days (e.g. Tue, Thu, Sat, Sun): the plan sticks to them.

I'm a beginner, is this plan for me?

Not as a first long race: if you declare a beginner level, Endu flags it. Aim for a shorter race of the same kind first; Endu builds that preparation too.

Can I follow sessions on my watch?

Yes, on Garmin and COROS. On Garmin, the Endu app (Connect IQ Store) shows today’s session and starts it as a guided workout. On COROS, link your account from your profile: your running, trail and cycling sessions land in the watch calendar. Other brands are not supported yet.

How much does it cost?

14-day free trial, then €7.99/month with no commitment or €59.88/year (€4.99/month). Unlimited objectives and sports.

Chtriman Gravelines 2027: date, course and training plan

226 km · swim 3.8 · bike 180 · run 42Gravelines2027 edition: 27 June 2027

The Chtriman takes place at the end of June at the PAarc des Rives de l’Aa, in Gravelines (Nord). The 226 is a full Ironman distance: a 3.8 km swim in the lake, 180 km of cycling in the Flemish countryside and a marathon in four loops on site, in front of the crowd. The 113, the duathlon and the Swim Bike L are raced the same Sunday, the short races the day before.

A demanding distance: it is wiser to have finished a shorter race of the same kind first.

Your plan for Chtriman Gravelines

34 weeks to go: your plan starts this week, set to your level and free days, then adapts to your feedback after each session.

Your level?

14-day trial, cancel anytime.

Chtriman Gravelines at a glance

Date: 2027 edition: 27 June 2027
Formats: Chtriman 226Plan below — 3.8 km swim (2 loops), 180 km bike (2 × 90 km), 42 km run (4 laps). Sunday 27 June 2027, 7 am start. Cut-offs: swim by 9 am, bike km 141 by 3:30 pm and km 163 by 4:30 pm, last run lap started by 8:30 pm. No drafting.
Chtriman 113 — 1.9 km swim (1 loop), 90 km bike (1 lap), 21 km run (2 laps). Sunday 27 June 2027, wave starts: women at 11:30 am, licensed men at noon, unlicensed men at 12:15 pm. No drafting.
Duathlon 111 et Swim Bike L — Duathlon: 10 km run, 90 km bike, 10.5 km run, 9 am start. Swim Bike L: 1.9 km swim and 90 km bike, 8 am start. Sunday 27 June 2027.
Chtri'S, Chtri'XS et courses jeunes — On Saturday 26 June 2027: XS at 3:50 pm, women’s S at 5 pm, men’s S at 6:30 pm, and races for 6 to 13-year-olds.
Registration: Registration on Prolivesport. The long distances (226, 113, duathlon, Swim Bike L) have been open since Monday 14 September 2026 at 8 pm. As of 17 October 2026, the platform showed 110 places left on the 226 and only 12 on the 113. 2027 prices for the 226: €240 until 30 November 2026, €260 until 28 February 2027, then €280; 113 and duathlon: €125, €140 then €155; Swim Bike L: €75, €85 then €105. Without an FFTri licence, add the day licence (€40 on the 226 and 113). A cancellation option gives a full refund before 1 June. The S and XS open in December 2026 (the organisers announced 14 December at 8 pm, the platform shows 5 December at 10 am), the youth races on 3 April 2027 at 10 am. A waiting list may open once a race is full.
Official website: chtriman.com

The 2026 course

Everything happens at the PAarc des Rives de l’Aa, in Gravelines. The 226 swims two loops in the lake (3.8 km), then rides a 90 km loop through the Flemish countryside twice, with aid stations at Zuytpeene (km 141 on the second lap) and Millam (km 163), and a special-needs station at the PAarc at km 90. The marathon is four laps of about 10.5 km winding around the PAarc site, with new paths in 2026. The 113 swims one 1.9 km loop, rides a single bike lap (Zuytpeene at km 51, Millam at km 73) and runs two laps.

What the race asks of your training

A flat, windy bike course

No climbs, but the Flemish countryside is flat and exposed: you pedal all the time, with no descents to recover. Long rides in the aero position, at steady power, prepare you better than mountain rides.

The bike cut-offs

You must reach km 141 by 3:30 pm, about 20 to 22 km/h on average on the bike depending on your swim time (22 km/h if you leave the water at the 9 am cut-off). Checking your real speed on a 5 to 6-hour ride late in the build-up avoids discovering the cut-off in the race.

The 113 starts late morning

The 113 starts between 11:30 am and 12:15 pm: you run the half in the middle of the afternoon. Testing your morning meal and getting used to running in the heat of the day are part of the build-up.

Late June heat

In 2026, the Saturday races were banned by prefectoral order during a red heatwave alert; the Sunday races went ahead. The longest sessions fall in May and June: doing a few of them in the heat of the day, at easy endurance pace, prepares your body for a marathon run in the afternoon.

The plan below prepares the Chtriman 226 format, for an athlete at intermediate level with 7 days available per week, with race day on 27 June 2027. Aiming for another format? Enter its distance when you create your plan, which will be calibrated on your level, your available days and your feedback after every session.

weeks: 25
sessions: 173
sessions / week: 7
peak week: 14.1 h

Plan structure

Periodised in phases: build the base, move to race-specific work, then taper before the race.

General preparation
Weeks 1–2 · 2 wk
Base
Weeks 3–10 · 8 wk
Build
Weeks 11–16 · 6 wk
Specific
Weeks 17–21 · 5 wk
Taper
Weeks 22–24 · 3 wk
Race week
Weeks 25–25 · 1 wk

Volume progression

Week by week: lighter recovery weeks are built in to absorb the load.

Wk	Phase	Hours	km
1	General preparation	8.8 h	30
2	General preparation	9.1 h	32
3	Base	9.9 h	29
4	Base	10.2 h	30
5	Base	10.5 h	31
6	Baserecovery	8.5 h	24
7	Base	10.7 h	32
8	Base	11 h	33
9	Base	11.3 h	34
10	Baserecovery	9.1 h	26
11	Build	11.7 h	35
12	Build	12 h	36
13	Build	12.2 h	36
14	Buildrecovery	9.7 h	30
15	Build	12.4 h	37
16	Build	12.6 h	37
17	Specific	13.3 h	39
18	Specificrecovery	10.4 h	31
19	Specific	13.4 h	39
20	Specific	13.7 h	40
21	Specific	14.1 h	41
22	Taper	10.3 h	37
23	Taper	8.7 h	30
24	Taper	7.4 h	25
25	Race week	4.1 h	8

Sample week — week 15 (Build)

Real sessions from the plan with their targets. Each session is detailed step by step, and can be sent to a Garmin or COROS watch.

TuesdayRunningVery hard
3 × 1.2 km at MAS
2 min 30 s jog recovery
48 min · 8.8 km
TuesdaySwimmingEasy
1 h 14 continuous swim
1 h 14 · 3.4 km
WednesdayCyclingEasy
30 min at endurance pace
30 min
ThursdayBrickHard
1 h 34 bike + 24 min run
including 3 × 10 min at threshold on the bike
2 h 06
FridaySwimmingHard
9 × 300 m at threshold
20 s recovery
1 h 12 · 3.5 km
SaturdayCyclingEasy
4 h 23 at endurance pace
4 h 23
SundayRunningEasy
Long run 2 h 11
2 h 11 · 21.2 km

Example generated for a intermediate-level profile (MAS 15 km/h, 7 days available per week). Your plan will depend on your level, availability and feedback.

This plan’s check-up

Pass

A 25-week build (recommended minimum: 16); a longest run never more than 4% above the previous month’s; volume rising at most 8% from one week to the next; 85% of the time at easy effort; the longest session 4 weeks before the race; a taper cutting volume by 71% in race week.

4 worth knowing · 21 checks passed

Remarks

Lighter weeks — 5 loading weeks in a row without a lighter week (up to week 5).
Long run after the long ride — The long run falls the day after the long ride in 9 weeks.
Strength training — No strength session.
Fueling — Long sessions (up to 300 min in this plan) are where race fueling is rehearsed.

The 21 checks passed, in detail

Length of the build — 25 weeks: enough for this race (recommended minimum: 16).
Sessions per week — 7 sessions a week: the minimum for this race is met.
Volume progression — Running volume rises at most 8% from one week to the next (a signal appears beyond 20%).
Long run increase — Each week, the longest run is at most 4% longer than the longest of the previous month (benchmark: 10%).
Intensity distribution — About 85% of the time at easy effort: the most common distribution among trained endurance athletes.
Demanding sessions — No more than 3 demanding session(s) a week: suited to the level.
Hard days back to back — Demanding sessions are separated by easy days.
Rest days — At least one rest day a week.
Timing of the longest session — The longest session falls 4 weeks before the race: the right time.
Bike-run bricks — 9 bike-run bricks over the last 12 weeks.
Taper — Volume drops 71% in race week.
Intensity during the taper — Short race-pace efforts remain in the last two weeks.
Frequency during the taper — The number of sessions stays close to usual (86%).
Swim / bike / run balance — Swim 19%, bike 53%, run 28%: within coaches’ benchmarks.
Frequency per discipline — Each discipline comes back at least 2 times a week.
Sessions per week — 7 sessions a week: enough for a long format.
Open water — 5 open-water session(s) before the race.
Longest ride — The longest ride lasts 300 min (benchmark: 300 to 390 min).
Longest run — The longest run lasts 150 min (benchmark: 120 to 180 min).
Swim distance — The longest swim covers 92% of the race distance.
Long ride increase — The long ride grows in small steps.

Endu runs its own plans through the plan check open to everyone: same public rules, same thresholds, same sources. The rules and their sources, and a check of your own plan.

Why this plan works

Science-based periodisation

Base → build → specific → taper, with a recovery week every 3 to 4 weeks. Load goes up, but never two hard weeks in a row without a breather.

Paces, not vague feelings

Every session has target zones (pace, HR) computed from your MAS or a reference performance. A MAS test is built into the plan if you don't know yours.

Three disciplines, one load

Swim, bike and run are planned together: brick sessions, key sessions spread out, and a coherent total load week after week.

A plan that listens

After each session you rate how it felt (RPE). Too hard? The plan eases what follows. Skipped a session? It reschedules or absorbs it.

On your watch

On Garmin with the Endu app, on COROS by direct sync: the guided workout shows up on your wrist, step by step.

Reviews

What our users say.

4.8/5

“For triathlon, having all three sports in the same schedule really makes my life easier. I spend less time organising my training and I still enjoy following it just as much.”
Maxime · Triathlon
“At first I just wanted to try it. Now checking the next day’s session has become my little evening ritual 😊”
Sarah · Triathlon
“I used to spend more time looking for a plan than following one. Now I have my sessions, I know what to do and I stick to it. Really glad I tried it.”
Thomas · Running
“Training for my first half marathon and honestly, I’m getting into it! I even look at my next sessions ahead of time, when before I was mostly looking for an excuse not to go out 😂”
Camille · Running
“Simple to follow and really handy with the watch. I start my session and off I go.”
Julien · Running
“I took Endu to prepare a trail race with friends. I really like having my week already organised: it motivates me and I enjoy my runs more.”
Émilie · Trail
“What I like is no longer asking myself a thousand questions before going for a run. I follow the plan and I enjoy training.”
Nicolas · Trail
“With work and the kids, I thought I’d struggle to follow a plan. In the end, having a structure helps me a lot. Running has found a real place in my week again, and it feels good!”
Julie · Trail
“A good find to prepare my swimrun! It’s nice to find a plan for this sport. I’ve recommended it to my teammate.”
Antoine · Swimrun
“I run more regularly and, above all, with more desire. For that alone, I’m delighted.”
Laura · Swimrun

Your plan, not a template athlete's

This plan is generated for an athlete at intermediate level with 7 days available per week. Yours will be calibrated on your MAS, your available days and your feedback after every session. 3 minutes. 14-day trial, cancel anytime.

Create my plan for Chtriman Gravelines