How many weeks to prepare for ÖtillÖ Isles of Scilly?

For an athlete at intermediate level, Endu builds a 18-week preparation. If your race is closer, the plan compresses phases while keeping the taper; if it's further away, it extends the base phase.

How many sessions per week?

This example has 4.9 sessions per week. You choose 5 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?

The plan adapts to your declared level (beginner to semi-pro): starting volume, progression and intensity change. Endu also offers a "Discovery" mode without a race to build a base first.

Can I follow sessions on my watch?

Yes: every session exports as .fit, the format read by Garmin, Coros, Suunto, Polar and Wahoo. Import it in your watch app and the guided workout appears on your wrist.

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.

ÖtillÖ Isles of Scilly 2027: training plan

42 km · 6.5 km swim · 35.5 km runÎles ScillyUsual date: 7 June 2027

ÖtillÖ Isles of Scilly — 42 km · 6.5 km swim · 35.5 km run · Îles Scilly. Here is the preparation structure Endu generates for an athlete at intermediate level training 5 times a week, with race day on 7 June 2027. Your plan will be calibrated on your VMA, your available days and your feedback after every session.

Create my plan for ÖtillÖ Isles of Scilly

weeks: 18
sessions: 88
sessions / week: 4.9
peak week: 7.7 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 3–7 · 5 wk
Build
Weeks 8–11 · 4 wk
Specific
Weeks 12–15 · 4 wk
Taper
Weeks 16–17 · 2 wk
Race week
Weeks 18–18 · 1 wk

Volume progression

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

Wk	Phase	Hours	km
1	General preparation	4.5 h	35
2	General preparation	4.7 h	37
3	Base	5.4 h	34
4	Baserecovery	4 h	22
5	Base	5.5 h	35
6	Base	5.8 h	37
7	Base	6.3 h	38
8	Buildrecovery	4.9 h	29
9	Build	6.4 h	37
10	Build	6.5 h	37
11	Build	6.8 h	39
12	Specificrecovery	5.2 h	10
13	Specific	6.9 h	12
14	Specific	7.2 h	13
15	Specific	7.7 h	13
16	Taper	5.2 h	33
17	Taper	4.3 h	25
18	Race week	2 h	15

Sample week — week 10 (Build)

Real sessions from the plan with their targets. Each session is detailed step by step and exportable as .fit.

TuesdayModerate
🏊🏃 Swimrun brick 3×(8'+12') (plaquettes/pull-buoy)
1 h 15
WednesdayEasy
🏊 Open water endurance 59min (paddles/pull)
59 min
ThursdayHard
🏊 Swim threshold 8×300 m
58 min · 3.2 km
FridayVery hard
Intervals 5×1.2km
1 h 03 · 12.1 km
SundayEasy
Long run 137min
2 h 17 · 22.1 km

Example generated for a intermediate-level profile (VMA 15 km/h, 5 sessions/week). Your plan will depend on your level, availability and feedback.

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 VMA or a reference performance. A VMA test is built into the plan if you don't know yours.

Transitions and gear

Swim / run transition sessions with paddles and pull-buoy, so your body gets used to switching effort and running wet.

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

.fit export compatible with Garmin, Coros, Suunto, Polar: the guided workout shows up on your wrist, step by step.

Your plan, not a template athlete's

This plan is generated for an athlete at intermediate level training 5 times a week. Yours will be calibrated on your VMA, your available days and your feedback after every session. 3 minutes. 14-day trial, cancel anytime.

Create my plan for ÖtillÖ Isles of Scilly

Frequently asked questions

How many weeks to prepare for ÖtillÖ Isles of Scilly?: For an athlete at intermediate level, Endu builds a 18-week preparation. If your race is closer, the plan compresses phases while keeping the taper; if it's further away, it extends the base phase.
How many sessions per week?: This example has 4.9 sessions per week. You choose 5 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?: The plan adapts to your declared level (beginner to semi-pro): starting volume, progression and intensity change. Endu also offers a "Discovery" mode without a race to build a base first.
Can I follow sessions on my watch?: Yes: every session exports as .fit, the format read by Garmin, Coros, Suunto, Polar and Wahoo. Import it in your watch app and the guided workout appears on your wrist.
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.

Useful calculators

CSS calculator (critical swim speed)Effort-kilometre calculator VMA calculator Race fuelling calculator

By distance

Sprint swimrun Swimrun Long swimrun

Programmes without a race

Getting started Maintenance Return from injury

By race

Swimrun Côte Vermeille SWIMRUNMAN Gorges du Verdon Swimrun de Marseille Swimrun des Calanques Swimrun Nice Swimrun du Lac d'Annecy SWIMRUNMAN Grands Lacs de Laffrey Anjou Swimrun