How to Train for Your First Ultramarathon?

Training for your first ultramarathon is about building durability, not just fitness. An ultramarathon is any race longer than the marathon distance, typically starting at 50km and extending to 100km or more. Success depends on endurance, pacing, fueling, and the ability to manage fatigue over long periods. Unlike shorter races, performance is limited by how well you sustain effort, not how fast you can go.

What Changes When You Go Beyond the Marathon?

Ultramarathons shift the focus from speed to resilience. Glycogen depletion, muscle breakdown, and mental fatigue become primary limiting factors. Running economy matters, but durability and energy management matter more. Training volume increases, but intensity decreases. Most sessions are performed at low aerobic effort to allow accumulation of time on feet without excessive fatigue.

Build an Aerobic Base First

The foundation of ultramarathon training is aerobic development. This means consistent easy running that improves endurance and efficiency. Most weekly mileage should be done at an easy pace where breathing is controlled and sustainable. This builds the physiological base required for long-distance efforts. Heart rate typically stays in a low aerobic zone, allowing you to accumulate volume without breakdown.

Long Runs: The Core of Ultra Training

Long runs are the most important sessions in ultramarathon preparation. They build endurance, mental resilience, and fueling tolerance.
Unlike marathon training, ultramarathon preparation often includes back-to-back long runs. This simulates fatigue and prepares the body for running on tired legs.
Example structure:

• Day one: long run
• Day two: medium-long run
  This approach builds durability without requiring extreme single-session distances.

Time on Feet vs Distance

Ultramarathon training prioritises time on feet over strict mileage targets. Terrain, elevation, and conditions all affect effort.
Running for three to six hours at an easy pace is more relevant than hitting a specific distance. This better reflects race conditions.
Hiking is also part of training, especially for trail ultras with elevation.

Weekly Structure for Ultra Training

A typical training week balances volume, recovery, and specificity.

• Easy runs: majority of weekly mileage
• Long runs: one or two per week
• Back-to-back sessions: used strategically
• Recovery days: essential for adaptation

Speed work is limited but still useful in small doses to maintain efficiency. This structure becomes even more important as race duration increases, especially when preparing for extreme formats like training for a 24-hour ultramarathon with race-specific strategies and long-duration fatigue management.

Do You Need Speed Work?

Speed is not the priority, but some structured intensity improves running economy. Short intervals and tempo efforts can be included once per week to maintain efficiency and prevent stagnation. These sessions should not compromise recovery or long-run quality.

Nutrition Training Is Essential

Fueling is a key part of ultramarathon success. You must train your gut to tolerate carbohydrates over long durations. During long runs, practice consuming 60 to 90g of carbohydrates per hour along with fluids and electrolytes. Test different products and strategies. What works in training is what you use on race day.

Hydration and Electrolytes

• Hydration needs increase with duration and environmental conditions.
• You need to replace fluids and sodium consistently to avoid dehydration and performance decline.
• Sweat rate varies, so hydration strategy should be tested during long runs.

A hydration strategy for runners is a planned approach to fluid and electrolyte intake before, during, and after running to maintain performance and prevent fatigue. It matters because even mild dehydration reduces endurance, increases heart rate, and accelerates fatigue.

Terrain-Specific Training

• If your race includes trails, hills, or technical terrain, your training must reflect that.
• Trail running requires different muscle engagement and pacing strategies compared to road running.
• Include elevation gain, downhill running, and technical sections in training.
• This improves strength, coordination, and confidence.

Gear and Equipment Practice

• Ultramarathons often require carrying nutrition, fluids, and gear.
• Train with the same equipment you’ll use on race day, vest, shoes, and nutrition setup.
• This reduces risk of discomfort and improves efficiency during the race.

Recovery Becomes Critical

• Higher training volume increases the need for recovery.
• Sleep, nutrition, and easy days are essential to allow adaptation.
• Ignoring recovery leads to fatigue accumulation and increased injury risk.
• Easy runs should feel genuinely easy to support this process.

Common Mistakes

• Increasing mileage too quickly leads to injury.
• Ignoring fueling during training results in race-day failure.
• Running long runs too fast reduces adaptation and increases fatigue.
• Not practicing terrain-specific skills limits performance.
• Skipping recovery days prevents progress.

Practical Checklist

• Build aerobic base before increasing volume
• Prioritise long runs and back-to-back sessions
• Train fueling and hydration strategies
• Include terrain-specific training
• Use consistent, easy pacing
• Practice with race-day gear
• Prioritise recovery

What You Should Do:

• Start by increasing your weekly mileage gradually. Focus on consistency rather than intensity.
• Introduce long runs progressively, then add back-to-back sessions as your capacity improves.
• Test everything in training, nutrition, hydration, gear, and pacing.
• Keep effort controlled. The goal is to finish strong, not start fast.
• Ultramarathon success comes from execution, not speed.

FAQ