Stepping Up Your Distance: Choosing Your First Ultramarathon

So, you’ve conquered the 26.2 miles. The marathon medal is hanging proudly on your wall, your legs have recovered, and you find yourself wondering a familiar, dangerous thought: what’s next?

For many UK runners, the logical progression is to look past the marathon and step into the world of ultramarathons. Technically, an ultramarathon is any footrace longer than the standard 26.2 miles (42.195 kilometres). But stepping up to an ultra isn’t just about adding more miles, it’s a complete shift in mindset, terrain and pacing.

If you are ready to push your boundaries, here is a guide to choosing your first ultramarathon and how to transition safely.

The 50km: Your Perfect Stepping Stone

While the word "ultramarathon" conjures images of gruelling multi-day treks across deserts, your first foray into the sport doesn't need to be extreme. The shortest recognised ultra distance is typically the 50km (roughly 31 miles), making it the perfect entry point.

A 50km race is only about five miles longer than a marathon. If you can train for and complete a road marathon, you already have the physiological engine to finish a 50k. The difference usually lies in the terrain, as the vast majority of UK 50km races take place on trails, coastal paths or fells.

Going Further: The Classic Ultra Distances

Once you have the 50km under your belt, the ultra world opens up with several distinct milestones:

●      50 Miles (approx. 80km): This is where nutrition and pacing become absolute make-or-break factors. You will spend significantly longer on your feet, often running from dawn until dusk.

●      100km (62 miles): A classic international distance that requires a solid pacing strategy and often a shift towards running in the dark.

●      100 Miles: The holy grail for many ultrarunners. Completing a 100 miler requires running through the night, battling sleep deprivation, and extreme mental resilience.

●      Multi-Day Stages: Events where you run back-to-back marathon or ultra distances over several days, often carrying your own gear.

The Backyard Ultra: A Different Beast Entirely

If you want to push for a personal best in distance, you should strongly consider a "Backyard Ultra". This format has exploded in popularity across the UK in recent years.

Instead of a point-to-point race, a backyard ultra is a looped endurance event. Competitors must run a 4.167-mile loop every single hour. If you finish the loop in 45 minutes, you get 15 minutes to rest, eat, and regroup before the next hour begins. The race only ends when one single runner remains.

Logistically, backyard ultras are brilliant for beginners. You have a central "basecamp" where you can store all your food, changes of clothes, and supplies, meaning you don't need to carry a heavy hydration pack. It is one of the safest environments to discover exactly how far your body can go before it says "no more".

Crucial Tips for the Marathon to Ultra Transition

Moving from road marathons to trail ultras requires a few adjustments to your training and race-day strategy.

1. Leave the Watch Behind (and Walk the Hills!)

Road marathoners are often obsessed with their minute-per-mile pace. In an ultra, terrain dictates your speed. A mile through a muddy Peak District bog or up a steep Welsh fell will take significantly longer than a mile on tarmac. Learn to run-to-effort, not pace. More importantly, embrace the ultrarunning golden rule: walk the hills. Power-hiking steep inclines saves your leg muscles for the runnable flats and downhills.

2. Overhaul Your Nutrition

You can survive a marathon on sugary energy gels and water, but try that for 50 miles and you will likely face severe gastrointestinal distress. Because you are moving at a lower intensity during an ultra but for a longer period of time, your body can digest solid foods. Practise eating "real food" on your long runs. Flapjacks, salted boiled potatoes, sandwiches and salty snacks are all staples at most ultra checkpoints.

3. Prioritise Foot Care and Shock Absorption

The sheer volume of time spent on your feet during an ultramarathon magnifies any minor biomechanical issues. Blisters, bruised heels and plantar fasciitis are common ultra-killers. While investing in proper trail shoes with good lugs for UK mud is essential, factory shoe inserts often lack the long-term support you need. Swapping them out for a pair of Enertor running insoles is a smart move. Their advanced shock absorption technology protects your joints from the repetitive impact of ultra distances and significantly reduces the risk of overuse injuries. Pair them with a mid-race sock change, and your feet will feel like they have a new lease of life!

4. Gear Up Properly

Most UK ultras have a mandatory kit list to keep you safe in unpredictable British weather. You will need to invest in a comfortable running vest, a quality waterproof jacket (with taped seams), a foil blanket and a headtorch. Train with this kit so you get used to the weight and can identify any chafing spots early.

Finding Your First Race

The UK boasts some of the most spectacular ultra-running terrain in the world, from the rolling South Downs to the rugged Scottish Highlands. When you feel ready to take the plunge, spending some time researching the right event is vital. Look for a route with a generous cut-off time and well-stocked aid stations for your debut.

To explore a comprehensive list of upcoming events and find the perfect route for your debut, check out this great directory of UK ultra marathon races.

Stepping up to an ultramarathon is an incredibly rewarding journey. It requires patience, a strong stomach, and a willingness to embrace the mud. Take your time, build your mileage gradually, and enjoy the adventure that awaits past the 26.2-mile marker.