When is the 2027 T24 Île de Ré?

Start on Saturday 12 June 2027 at 11 am, on the Plage de la Loge, for 24 hours of racing: finishes begin on Sunday 13 June at 11 am. Bib collection on Friday from 4 pm to 10 pm.

How does the T24 ranking work?

On points: 15 per km swum, 1 per km cycled, 4 per km run, with possible bonuses. Every participant must complete at least one loop of each discipline. In a tie, the team that finished its last run lap earliest ranks ahead.

Can you do the T24 without being an experienced triathlete?

Yes, in a team: the organisers recommend relays of 4, 5 or 6 for beginners. The solo and pairs categories call for a good level and a sound knowledge of your limits.

T24 Xtreme Île de Ré: 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.

T24 Xtreme Île de Ré 2027: date, course and training plan

226 km · swim 3.8 · bike 180 · run 42.2Île de Ré2027 edition: 12 June 2027

The T24 has no fixed distance: it is a 24-hour triathlon, with 4 hours of swimming, 12 hours of cycling and 8 hours of running, solo or in relay teams of 2 to 6. Rankings are on points, based on the kilometres covered. On the Île de Ré, where the concept was born in 2020, everything is flat, never above 5 m of altitude. The start is on Saturday 12 June 2027 at 11 am, on the Plage de la Loge, with finishes from 11 am on the Sunday.

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

Your plan for T24 Xtreme Île de Ré

31 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.

T24 Xtreme Île de Ré at a glance

Date: 2027 edition: 12 June 2027
Formats: T24 individuelPlan below — From 11 am to 3 pm, as many laps as possible of a roughly 1 km sea loop, with a beach exit on every lap. From 3 pm to 3 am, cycling on a 21 km day loop (27 m of climbing) until 9 pm, then a 16 km night loop (23 m of climbing). From 3 am to 11 am, running on a 6.75 km loop (track, sand, road). You must complete at least one loop of each discipline. Scoring: 15 points per km swum, 1 per km cycled, 4 per km run.
T24 en relais — Teams of 2, 3, 4, 5 or 6, men’s, women’s or mixed. Only one team member on course at a time; changeovers happen in a dedicated zone, with a wristband as the baton. The organisers describe relays of 4, 5 or 6 as the most accessible for beginners.
Registration: Online registration from the official website. 2027 prices per person: solo, €430 until 25 October 2026, then €484 and €538 depending on the date; relays, from €348 (pairs) down to €178 (teams of 6) at the first price tier. Licence Expérience at €10 for non-licensed athletes, T24 cover at €19 for more flexible cancellation, deferral or replacement terms, 10% off for 18 to 25-year-olds and for clubs of at least 10 members.
Official website: t24-triathlon.com/t24-ile-de-re

The 2027 course

Swim: a roughly 1 km sea loop from the Plage de la Loge, from 11 am to 3 pm. Bike: a 21 km day loop (27 m of climbing) from 3 pm to 9 pm, then a 16 km night loop (23 m of climbing) until 3 am. Run: a 6.75 km loop of track, sand and road, from 3 am to 11 am. The organisers may change the routes for safety reasons.

What the race asks of your training

An Ironman plan as the base

The sample plan below is an Ironman plan (3.8 / 180 / 42 km): it is the right volume base for a solo T24, but the goal is different. It is not about speed but about lasting 24 hours: 4 hours of swimming, 12 of cycling and 8 of running. The island records are 902 points for men and 704 for women in the solo category.

Riding and running at night

Night falls around 10 pm and day returns around 6 am: much of the bike and the start of the run happen in the dark. A few long evening sessions with your race-day lights, and a plan for sleep and fuelling, which the organisers name as key, prepare you for the all-nighter.

Flat, but full of bends

No climbs, but many bends to accelerate out of, on a bike loop ridden dozens of times. Holding a comfortable position for hours matters more than speed; a road bike is recommended, although time-trial bikes are allowed.

Sea swimming and running on sand

The swim is in the sea (water announced at 20 °C, wetsuit compulsory below 16 °C), with a beach exit on every lap. The run loop mixes tracks, sand and road: a few runs on soft ground and open-water sessions with repeated exits get you used to these changes.

The plan below prepares the T24 individuel format, for an athlete at intermediate level with 7 days available per week, with race day on 12 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: 172
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	3.4 h	7

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 76% in race week.

5 worth knowing · 20 checks passed

Remarks

Lighter weeks — 5 loading weeks in a row without a lighter week (up to week 5).
Frequency during the taper — The last two weeks keep only 79% of the usual sessions.
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 20 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 76% in race week.
Intensity during the taper — Short race-pace efforts remain in the last two weeks.
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 T24 Xtreme Île de Ré