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100K Ultramarathon Training Plan
Build the endurance, durability, and race-day strategy needed to take on your first—or strongest—100K ultramarathon.
Training for a 100K requires more than just increasing mileage.
It’s about learning how to manage effort over longer durations, staying consistent across multiple days, and building the durability needed to handle fatigue late in the race. This 100K ultramarathon running plan guides you step by step, helping you stay consistent, avoid burnout, and arrive at race day ready to execute.
Delivered through Final Surge. Sync to your watch and follow each workout with built-in coaching guidance.
Who This Plan Is For
This plan is built for runners who have experience with longer ultramarathon distances and are ready to take the next step.
Not sure if you’re ready?
Read: Am I Ready for an Ultramarathon?
If you’re not quite there yet, you may want to start with one of these other training plans first.
What Makes This 100K Ultramarathon Running Plan Different
Most plans focus on how much you run. This plan focuses on how you manage effort, fatigue, and consistency over longer durations.
What To Expect
This 100K ultramarathon running plan builds your endurance while preparing you to handle longer efforts and manage fatigue across multiple days.
What You Get Inside the 100K Ultramarathon Running Plan
The 100 mile running plan follows the following structure and is available for purchase through Coach Andrew Taylor’s Final Surge coaching page. Here’s how the plan is structured to help you build endurance, manage fatigue, and prepare for the demands of a 100K race.
Overview:
- Duration: 24 Weeks
- Runs Per Week: 5 Days
- Weekly Mileage: ~40–75 miles
- Average Weekly Mileage: ~50–65 miles
- Peak Weekly Mileage: ~70–75 miles
Time Commitment:
- Early Phase: 6–8 hours per week
- Build Phase: 8–11 hours per week
- Peak Phase: 10–13 hours per week
Training Structure:
- Easy runs, recovery runs, and medium-long runs
- Long runs building up to 30 miles
- Back-to-back long run progression
- Optional 50K effort during peak phase
- Build weeks, recovery weeks, peak phase, and full taper
Strength, Mobility, and Injury Prevention
Includes guidance for light strength, core, and mobility work to support durability without adding unnecessary fatigue.
- Activation warmups before runs
- Optional strength and core work
- Mobility and recovery routines
How It Works
See What a Week Looks Like in the 100K Ultramarathon Running Plan
Here’s a sample week from the plan so you can see how the training is structured and how each day builds toward race readiness.
Week 14 – Build Phase
This is a key week in your training where everything starts to come together.
You’re building on a strong foundation, and the focus now is on executing longer efforts with control, consistency, and awareness. The goal isn’t just to complete the distance—it’s to manage your effort, fuel consistently, and stay steady as fatigue builds.
This is what 100K training looks like: patient early, controlled throughout, and focused late.
Rest or Cross-Training
Full rest or light cross-training (walking, mobility, easy cycling)
How it should feel:
Unstructured and relaxed
Coaching cue:
Take the pressure off today—this is where recovery supports your next strong effort.
Adjust if needed:
Feeling tired → full rest
Want movement → keep it light and brief
Goal:
Reset physically and mentally before the week builds
Easy Run + Strides
8 miles – Easy (RPE 4–5)
+ 4–6 × 20-second strides after the run
How it should feel:
Smooth and controlled
Strides quick but relaxed
Coaching cue:
Let your stride open naturally—this is about flow, not forcing speed.
Adjust if needed:
Tired → skip strides
Feeling good → keep them relaxed
Goal:
Maintain efficiency and reinforce good movement patterns
Medium Long Run
16 miles – Easy (RPE 4–5)
How it should feel:
Steady effort with a gradual sense of work over time
Coaching cue:
Lock into a sustainable effort early and resist the urge to speed up late.
Adjust if needed:
Fatigue → reduce by 1–2 miles
Busy day → split into 2 runs
Goal:
Build sustained endurance and time on feet
Recovery Run
6–7 miles – Recovery (RPE 2–3)
Optional: include a short 5-minute activation if it helps you loosen up.
How it should feel:
Very easy and relaxed
Coaching cue:
If this feels like effort, slow down or shorten—recovery is the priority.
Adjust if needed:
Legs heavy → run/walk
Still fatigued → shorten
Goal:
Promote recovery and maintain consistency
Rest or Light Movement
Rest day or optional light activity (short walk, mobility work)
How it should feel:
Low demand and relaxed
Coaching cue:
Protect your energy—this day helps you show up ready for the weekend.
Adjust if needed:
Tired → full rest
Feeling restless → short, easy movement
Goal:
Stay fresh for long efforts
Strength & Core (Optional)
10–15 minutes light strength or core work
How it should feel:
Controlled and steady
Coaching cue:
Focus on simple, quality movement—no need to add intensity.
Adjust if needed:
Tired → skip
Feeling good → keep it light
Goal:
Support durability and stability
Long Run
28–30 miles – Easy (RPE 4–5)
How it should feel:
Controlled early, more demanding as the run progresses
Coaching cue:
Stay patient through the first half, then focus on maintaining steady effort as fatigue builds.
Adjust if needed:
Fatigue → reduce slightly
Feeling strong → stay disciplined
Goal:
Extend endurance and practice sustained effort over long duration
Additional focus:
Be intentional with fueling from the beginning of the run. Consistent intake should help you maintain steady energy through the later miles.
Back-to-Back Long Run
13–14 miles – Easy (RPE 4–5)
How it should feel:
Steady with clear fatigue present
Coaching cue:
Focus on efficient movement—short, relaxed steps will help you stay controlled.
Adjust if needed:
Very fatigued → shorten
Overwhelmed → include walk breaks
Goal:
Reinforce durability and simulate late-race fatigue
Every run includes effort guidance, coaching cues, and adjustments—so you always know how to approach your training.
Frequently Asked Questions
This plan is designed for runners who have already completed a 50K or 50 mile race and are comfortable with consistent weekly mileage. You should have experience with longer efforts and be ready to build endurance across multiple days.
Most runners will train between 6–13 hours per week depending on the phase. Peak weeks require more time due to longer runs and back-to-back efforts.
No. This plan is built around effort (RPE), not rigid pacing or exact mileage. You’re encouraged to adjust based on how you feel while staying consistent.
Skip it and move forward. Avoid trying to make up missed mileage—focus on consistency over time.
This plan focuses on managing fatigue and building durability, not just increasing mileage. With structured progression and built-in coaching cues, it prepares you for the demands of longer ultramarathon racing.
Yes, but you should adjust terrain and effort to match your race conditions. Focus on effort rather than pace when terrain varies.
Yes. The plan includes guidance for light strength, core work, and mobility routines to support durability.
Yes. The plan is flexible and designed for real-life schedules. You can shift workouts while maintaining structure.
Reduce volume, shorten runs, or take additional rest. Managing fatigue is a key part of training for a 100K. These cues are built into the training plan to help you understand when and how to adjust.
No. This plan is effort-based, focusing on staying controlled and building endurance over time.
Schedule a 15-minute consultation to get personalized guidance before you start.
Ready to Train for Your 100K Race?
Build your endurance, refine your strategy, and prepare to go the distance with confidence.
Delivered instantly through Final Surge. Sync to your watch, track your progress, and follow your plan day by day.
Includes coaching cues and built-in adjustments in every workout.