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20-Week Programme

50 MILE
ULTRA
PREP.

The 50-miler is where you cross the line from marathon runner to ultramarathon runner. It demands a completely different mindset — you're not racing, you're managing. Pace, fuel, terrain and time on feet become your tools.

You should have completed a marathon before starting this plan. Peak weekly mileage hits 55–60 miles. Back-to-back long runs are the cornerstone. Walking is a strategy, not a failure.

⏱️ Time on Feet
Train by time, not distance. 6 hours on your feet matters more than the miles covered.
🔁 Back-to-Backs
Long run Saturday, medium-long Sunday. Teaches your body to run on fatigue.
🍌 Eat Early
Start fuelling at 30 minutes. Real food from mile 15. Practice your race-day nutrition in training.
🚶 Power Hike
Walking uphills is faster and more efficient. Train it deliberately every single week.
WeekMonTueWedThuFriSat — LongSun — B2B
01Base buildingRest5 mi easyStrength 45 min6 mi easyRest12 mi easy6 mi easy
02Adding volumeRest5 mi easyStrength 45 min7 mi w/ hillsRest14 mi easy7 mi easy
03Trail focusRest6 mi easyStrength 45 min8 mi trailRest16 mi trail8 mi easy
04RecoveryRest4 mi easyStrength 30 min5 mi easyRest10 mi easy5 mi easy
05Push againRest6 mi easyStrength 45 min8 mi hillsRest18 mi trail9 mi easy
💡 Phase 1 goal: Consistent mileage and back-to-backs. Keep ALL easy runs genuinely easy — Zone 2 heart rate. This phase builds the aerobic base that everything else sits on.
WeekMonTueWedThuFriSat — LongSun — B2B
06Vert introRest6 mi easyStrength 45 min10 mi with 2,000ft vertRest20 mi trail10 mi easy
07Big back-to-backRest6 mi easyStrength 45 min8 mi easy trailRest22 mi trail + gels12 mi tired legs
08RecoveryRest5 mi easyStrength 30 min6 mi easyRest14 mi easy7 mi easy
09Night runningRest6 mi easyStrength 45 min10 mi trailRest24 mi incl. 2 hrs night12 mi tired legs
10Real food focusRest7 mi easyStrength 45 min10 mi hillsRest26 mi trail + real food13 mi tired legs
11RecoveryRest5 mi easyStrength 30 min6 mi easyRest15 mi easy8 mi easy
💡 Phase 2 goal: Introduce night running in week 9 — at least 2 hours of your long run should be in the dark with your head torch. Practice your kit, nutrition and pacing in race-like conditions.
WeekMonTueWedThuFriSat — LongSun — B2B
12Peak loadingRest7 mi easyStrength 45 min12 mi vert dayRest28 mi trail14 mi tired legs
13Longest weekendRest7 mi easyStrength 45 min10 mi trailRest30 mi trail — full race kit15 mi tired legs
14RecoveryRest5 mi easyStrength 30 min6 mi easyRest15 mi easy8 mi easy
15Race sim weekendRest7 mi easyStrength 45 min10 mi trailRest32 mi — race pace effort16 mi tired legs
16High mileageRest8 mi easyStrength 45 min12 mi vertRest28 mi trail14 mi tired legs
17RecoveryRest5 mi easyStrength 30 min6 mi easyRest14 mi easy7 mi easy
💡 Week 13 is your biggest weekend — 30 miles Saturday in full race kit, 15 miles Sunday on tired legs. This is the hardest training block you'll do. Trust the process. The race will feel manageable after this.
WeekMonTueWedThuFriSatSun
18Begin taperRest6 mi easyStrength 30 min8 mi trailRest20 mi easy10 mi easy
19Wind downRest5 mi easyLight mobility6 mi easy + stridesRest12 mi easy6 mi easy
20Race week 🏔️Rest4 mi easy20 min walk2 mi shakeoutRest — prep kitRest — sleep early🏁 RACE DAY — 50 Miles!
💡 Taper madness is real. Your legs will feel heavy, you'll feel unfit, you'll want to run more. Don't. Your body is consolidating 20 weeks of training. Race day tips: start at conversation pace, eat before you're hungry, drink before you're thirsty, walk every uphill from mile 20 onwards, and remember — finishing IS winning.