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How to Prepare for 100 Miles of Ultra Running: Ultimate Training Guide

Updated: 5 days ago

Introduction to Ultra Running

Ultra running is a form of endurance running that exceeds the marathon distance of 26.2 miles. Typically, ultra races start at 50 kilometers (31 miles) and extend to distances like 50 miles, 100 kilometers, and 100 miles. For many, the 100-mile race is seen as the pinnacle of ultra running. These events test both physical endurance and mental resilience.


To succeed in a 100-mile race, preparation is key. It goes beyond just being fit; it requires structured training, proper nutrition, mental toughness, and careful planning. Whether you're a seasoned runner or tackling your first ultra marathon, understanding how to prepare for 100 miles of running can make the difference between reaching the finish line and dropping out early.


James Gibson running off of Beinn Rephisol
Running in the mountains in Scotland

Understanding the 100-Mile Challenge

Running 100 miles is unlike anything else in endurance sports. The sheer distance presents unique challenges. While traditional marathons demand physical stamina, ultra running stretches beyond that, requiring mental fortitude, proper pacing, and recovery management.


The Physical and Mental Demands of Ultra Running

James Gibson running 100 miles
James Gibson feeling knackered on The Lakes, Meres and Waters 100 Mile Ultra Run

Ultra running places significant stress on your body. The wear and tear from such distances mean that training for a 100-mile race must focus on not only building endurance but also on avoiding injury. You will be running for 20, 30, or even more hours, which involves mastering how to manage fatigue, maintain your pace, and overcome discomfort.


Mentally, the race will test your perseverance. You’ll likely experience low points where you feel like stopping, but pushing through these moments is part of the ultra running journey. Many ultra runners say that mental preparation is as important—if not more important—than physical readiness.


Common Myths about 100-Mile Races

There are plenty of misconceptions about ultra running. One common myth is that you need to run the entire race. In reality, walking is an essential part of many ultra running strategies. It’s often more about time on your feet and energy management than maintaining a continuous running pace.

Another myth is that you have to be an elite athlete to complete a 100-mile race. While it’s true that the top competitors are exceptionally fit, ultra running is about endurance, and anyone with the right mindset and training plan can achieve their goal of finishing.


Importance of a Training Plan and a Guide to Running 100 Miles

Training for a 100-mile race involves far more than simply running long distances. Developing a comprehensive training plan that balances running, strength training, rest, and nutrition is critical for success.


How to Create a Training Schedule

When preparing for a 100-mile race, you’ll need to gradually build up your weekly mileage. Most ultra running coaches recommend starting at a manageable base and increasing mileage slowly to avoid injury. Typically, you’ll aim to reach peak weekly distances of 50-60 miles before tapering closer to race day.


Balancing Work, Life, and Training

Training for ultra running can feel like a full-time job. However, with the right planning, you can balance training with work and family commitments. Scheduling long runs on weekends and prioritising key workouts during the week can make it easier to fit everything in.


Role of an Ultra Running Coach

Working with an ultra running coach can provide you with tailored guidance on how to prepare for 100 miles of running. Coaches like James Gibson Coaching offer customised training plans, advice on nutrition, and strategies to avoid burnout. A coach can also provide valuable mental support, helping you push through the toughest parts of your training and race.


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Building Endurance for Ultra Running

Endurance is the foundation of ultra running. Without it, running 100 miles is impossible. Building your endurance involves incorporating long runs, maintaining consistency, and balancing rest with intense training.


Long Runs and Weekly Mileage

The backbone of your ultra training will be long runs. You should aim to do these every weekend, gradually increasing the distance to mimic the demands of your race. A good goal is to complete several back-to-back long runs, such as 20-25 miles on consecutive days, to simulate race fatigue.


Improving Cardiovascular Fitness

In addition to long runs, incorporating tempo runs, hill work, and interval training will help boost your cardiovascular system. These workouts increase your stamina and help prepare your body for the varied terrain you’ll encounter during a 100-mile race.


Running away from Scafell
Steve Hopwood on a Wainwright Recce in 2021

Strength Training for Ultra Running

Strength training is a vital component often overlooked by ultra runners. Building muscle strength helps protect joints, improve posture, and enhance overall running efficiency.


Key Strength Exercises

Focus on compound movements like squats, lunges, deadlifts, and planks. These exercises target key running muscles—quads, hamstrings, glutes, and core. Strength training sessions can be performed 2-3 times per week, ensuring they are balanced with your running schedule.


Building Lower Body and Core Strength

Your legs and core do the bulk of the work in ultra running. Strengthening these areas can improve your form and delay fatigue. Incorporate exercises like leg presses, calf raises, and Russian twists to build a strong foundation for long-distance running.


Nutrition Strategies for 100 Miles

Proper nutrition is one of the most critical aspects of preparing for a 100-mile race. The food you consume in training and during the race itself directly affects your energy levels and recovery.


Pre-Race Nutrition

In the weeks leading up to your race, you should focus on maintaining a balanced diet rich in carbohydrates, proteins, and healthy fats. Carb-loading in the days before the event can help increase glycogen stores in your muscles, giving you the energy to sustain long distances.


Fueling Strategies During the Race

During a 100-mile race, you will need to consume calories regularly to prevent bonking (running out of energy). A mix of gels, bars, bananas, and electrolyte drinks can help sustain your energy levels. Aim for about 200-300 calories per hour to keep your body fueled.


Hydration and Electrolytes

Hydration is equally important. Your body loses salts through sweat, so drinking water combined with electrolytes will help you stay hydrated and prevent muscle cramps. Monitoring your hydration levels at aid stations is crucial to avoiding dehydration.


Mental Preparation for Long-Distance Races

Running 100 miles requires just as much mental strength as physical ability. You will encounter moments of doubt and fatigue, so mental preparation is key.


Staying Motivated During Training

Long runs can be monotonous, but keeping your end goal in mind helps maintain motivation. Visualisation techniques, focusing on small milestones, and keeping a training journal can help you stay on track.


Managing Mental Fatigue

During the race, fatigue will inevitably set in. Learning how to push through tough sections is a valuable skill. Breaking the race into smaller segments, taking short walking breaks, and reminding yourself why you started can help you overcome mental exhaustion.


Sunset on Grey Knots
Sunset in The Lake District

Role of Sleep and Recovery

Recovery is just as important as training. Without proper recovery, your body won’t be able to perform at its best come race day.


Rest Days and Active Recovery

Rest days should be an integral part of your training plan. These allow your muscles to repair and grow stronger. On active recovery days, light activities such as walking, swimming, or yoga can help maintain mobility without putting undue stress on your muscles.


Importance of Sleep for Muscle Repair

Sleep is when your body does most of its repair work. Aim for at least 7-8 hours of sleep per night, especially during the peak of your training. Prioritizing sleep will help reduce the risk of injury and improve overall performance.


Tapering Before the Race

Tapering is a crucial step in the weeks leading up to your 100-mile race. It involves gradually reducing your training intensity and mileage to allow your body to recover and prepare for race day.


What Is Tapering and Why It Matters

Tapering is the process of scaling back your workouts to give your muscles time to rebuild and recharge before the big event. It’s essential for ultra running because it helps prevent overtraining and reduces the risk of burnout. During this period, your body’s glycogen stores replenish, muscles repair, and overall fatigue diminishes.


Tapering Strategies for Ultra Runners

A good tapering strategy typically starts two to three weeks before race day. In this phase, reduce your weekly mileage by 20-30% per week, while keeping some intensity in your runs. Include light tempo runs or intervals to maintain sharpness, but avoid any long runs or high-impact workouts. Rest becomes the priority during this time, as you prepare to handle the physical demands of 100 miles.

Cloud Inversion in the Lake District
Sunrise with a tempruture inversion in The Lake District

Choosing the Right Gear for Ultra Running

The right gear can make or break your ultra running experience. You’ll be out on the trails or hilla for hours, so comfort and functionality are key.


Selecting Shoes and Apparel

Choosing the right shoes for a 100-mile race is vital. Look for trail running shoes with plenty of cushioning, good traction, and enough durability to last the entire race. Comfort is more important than style, as poorly fitted shoes can lead to blisters and other foot issues. I use a range of INOV8 shoes, which have been perfect for 100 mile runs such as The Lakes, Meres & Waters (a 100 mile route, linking every Lake, Mere & Water in the Lake District)


INOV8 Mudtalon Speed
INOV8 Mudtalon Speed, The Best Fell Running Shoe Around!

For apparel, opt for moisture-wicking materials that will keep you dry and prevent chafing. Many ultra runners wear compression shorts and shirts to reduce muscle fatigue and improve circulation. A lightweight jacket or windbreaker is also essential in case of unpredictable weather conditions. Again, I have used INOV8 gear for years and their kit has never failed me, even on 24 hour technical running ultra's like The Cuillin Round, which involves lots of scrambling and also climbing.


Must-Have Accessories for 100 Miles

Key accessories for ultra running include hydration vests, hats, and anti-chafing creams. A hydration vest allows you to carry water, snacks, and gear without the need for frequent stops at aid stations. Running hats and buffs can protect you from the sun, while anti-chafing creams are a must for avoiding discomfort during long distances.


Head torches are also crucial, especially for night running. In most 100-mile races, you’ll be running in the dark at some point, so a reliable head torch with long battery life is essential.


Race Day Strategy

On race day, having a well-planned strategy can make the experience more manageable and enjoyable. It’s about pacing, nutrition, and knowing how to handle the unexpected.


Pacing for 100 Miles

Pacing is everything in ultra running. Starting too fast can lead to burnout, while starting too slow could leave you playing catch-up later on. A general rule is to maintain a pace that feels comfortable, especially in the first half of the race. You can always speed up later if you feel strong. This 100 mile training guide will help you understand what is needed to pace yourself for the ultra runnning distance of 100 miles.


Many ultra runners use a run-walk strategy, alternating between running and brisk walking to conserve energy. This method is particularly useful on hilly terrain, where walking uphill can save strength for the flatter sections.


James Gibson on his Wainwright Round
James Gibson finishing his second Wainwright Round in April 2022

Managing Aid Stations and Checkpoints

Aid stations are a lifeline during 100-mile races. They provide food, drinks, and sometimes medical support. Plan your stops carefully—take the time to refuel, check your hydration levels, and adjust your gear if necessary. However, avoid spending too long at aid stations, as lingering can break your rhythm.


Prepare for emergencies by packing a small first-aid kit with blister bandages, electrolyte tablets, and any medications you may need.


Dealing with Common Injuries

Injuries are a part of long-distance running, but with proper precautions, you can minimize the risk and handle any issues that arise during the race.


Preventing Blisters and Chafing

Blisters and chafing are among the most common issues ultra runners face. Prevent blisters by wearing moisture-wicking socks and well-fitted shoes. Some runners apply foot powders or lubricants like petroleum jelly to reduce friction.


Chafing can occur around the thighs, arms, or any area where skin rubs against skin or clothing. Use anti-chafing balms and wear clothing designed to reduce friction.


Recognising and Managing Muscle Cramps

Muscle cramps, often caused by dehydration or an electrolyte imbalance, can stop you in your tracks. To prevent cramps, make sure you’re properly hydrated and consuming electrolytes throughout the race. Stretching and gentle massage can help alleviate cramps when they arise.

If cramps become severe, slow down your pace, drink fluids, and give your muscles time to recover before pushing forward.


Post-Race Recovery

The race doesn’t end when you cross the finish line. Proper post-race recovery is essential to help your body heal and reduce soreness after the grueling 100-mile challenge.


Immediate Steps After the Race

After completing a 100-mile race, your priority should be rehydration and replenishing your energy stores. Start by drinking water and electrolyte drinks, followed by a meal rich in carbohydrates and protein. This helps to rebuild glycogen stores and repair muscle damage.

It’s also important to cool down with gentle stretching or walking to reduce muscle stiffness. Avoid sitting down immediately, as this can lead to cramps or delayed-onset muscle soreness (DOMS).


Long-Term Recovery Strategies

Recovery doesn’t stop after the first 24 hours. In the days following the race, focus on light activities like swimming, yoga, or walking to keep your muscles loose. Sleep and proper nutrition are also key components of recovery, helping your body repair the wear and tear from running 100 miles. Many ultra runners schedule massages or use foam rollers to aid in muscle recovery and reduce soreness.


Working with an Ultra Running Coach

Whether you’re a beginner or an experienced ultra runner, working with a coach can enhance your performance and help you reach your goals.


Benefits of Personalised Coaching

An ultra running coach provides tailored training plans based on your fitness level, goals, and race schedule. A coach helps you focus on areas that need improvement, from building endurance to refining your pacing strategy. They can also offer support during the mental challenges that come with training for a 100-mile race.


How James Gibson Coaching Can Help You Succeed

James Gibson Coaching specializes in ultra running and has helped countless runners prepare for ultra races, including 100-milers, Bob Graham's, Dragons Back Race, Race Across Scotland, UTS 100, Lakeland 100 and many more. With personalised guidance and expert advice on both physical and mental aspects of training, James Gibson Coaching offers invaluable support for those looking to complete the ultimate challenge in ultra running.


James Gibson’s approach emphasises sustainable training that prevents injury and burnout while focusing on building mental resilience. Whether you need help with structured training sessions, or accountability or are simply unsure how to prepare for long-distance ultra running, then working with a seasoned ultra running coach like James Gibson can give you the confidence and skills you need to succeed.


James Gibson Coaching Logo

FAQs about Running 100 Miles


How long should I train for a 100-mile race?

Most ultra runners train for 6 to 12 months to prepare for a 100-mile race. The exact timeline depends on your experience level and current fitness. Beginners may need closer to a year of structured training, while seasoned runners might require less.


What should I eat during a 100-mile race?

During a 100-mile race, aim to consume 200-300 calories per hour. This can come from energy gels, bars, bananas, trail mix, or electrolyte drinks. It’s important to find foods that work well with your stomach, as eating during long races can sometimes cause digestive issues.


How do I prevent injury during ultra marathons?

Preventing injury involves proper training, strength work, and recovery. Build mileage gradually, incorporate strength training, and listen to your body. If you feel pain or discomfort, address it early to prevent more severe injuries.


Is it possible to run 100 miles without walking?

While some elite runners can run the entire 100 miles, most ultra runners use a run-walk strategy, especially on uphill sections. Walking allows you to conserve energy and reduce the risk of burnout, making it a smart strategy for finishing strong.


How do I stay motivated during a 100-mile race?

Staying motivated during such a long race can be tough. Break the race into smaller segments, focus on reaching the next aid station, and remember your reasons for running. Mental tricks like visualisation and positive self-talk can also help. Listening to music can also help loads too.


What type of terrain should I train on for a 100-mile race?

Train on terrain that closely matches the race you’re preparing for. If the race is on trails, focus on trail running. If it involves lots of elevation, incorporate hill training into your workouts. The more you simulate race conditions in training, the better prepared you’ll be.


Conclusion

Running 100 miles is an incredible challenge that requires meticulous preparation, both physically and mentally. From building endurance and strength to mastering nutrition and recovery, every element plays a crucial role in reaching the finish line. With the guidance of an ultra running coach like James Gibson Coaching, your training can be structured to give you the best chance of success.


Preparing for a 100-mile race might seem daunting, but with determination, a smart training plan, and a support system in place, it's a challenge you can conquer. Happy running, and remember: the journey is just as important as the destination.

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