Challenge Running Ltd

Challenge Running Ltd

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Trail Running Event organiser. home of the UK's largest Backyard Ultra and other ultra distance races.

Photos from Challenge Running Ltd's post 19/08/2026

Women haven't just taken part in ultrarunning history. They've helped shape it.

From Mavis Hutchison taking on Comrades when women weren't officially allowed to compete, to Ann Trason dominating Western States, Courtney Dauwalter Courtney Dauwalter redefining what's possible and Rachel Entrekin becoming the first woman to win Cocodona outright and our own Sarah Perry showing what is possible!

Different generations. Different distances. Different barriers.

But every one of these women pushed the sport forward. Now we have organisations such as !

And this carousel only shows seven of them.

Who would you add to the list?

Photos from Challenge Running Ltd's post 15/08/2026

New to the Back Yard concept or having to explain for the 50th time the race you are doing this year? Read through the slides and share so people can understand how awesome this format is!

The current world records: 119 laps (495.8 miles and almost 5 full days) for the men, held by Phil Gore. 95 laps (395.8 miles) for the women, held by Sarah Perry. Both run at Big's Backyard Ultra, the original event, created by Lazarus Lake.

Our next back yard is Thetford Backyard Ultra Festival is on 12th September. Come and join us for an unforgettable experience.

Same rules, same brutal simplicity: 4.167 miles, every hour, until one person's left.

https://www.challenge-running.com/e/thetford-back-yard-ultra-festival-11505

14/08/2026

Let's talk numbers.

Like everything else, our costs go up every year. Race insurance, venues, food, portaloos (yes, really), the list goes on.

So from 1st September, entry fees are rising by around 10% across the board.

We're not going to pretend that's nothing. But we are giving you fair warning and a proper window to lock in the current price before it changes.

Enter before 1st Sept, pay what you'd pay today.

The secret's on the sign. Keep going. And get in before the price increases.

12/08/2026

You've had that 100 miles in your sights. It's not been plain sailing. Your body and your mind have wanted to give in and take the DNF but.... you keep going. The legs keep taking steps forward and you do it!

There are easier ways of getting to 100 miles, but that's exactly why it's such a milestone in the Backyard.

Can we tempt you?

12th September - Thetford Forest Backyard Ultra Festival

Includes a 6 and 12 hour option so you could go for that first 25/50 miler!

https://www.challenge-running.com/e/thetford-back-yard-ultra-festival-11505

Photos from Challenge Running Ltd's post 07/08/2026

You've slept on your pillow wrong and now you can't move your neck - It is time to join the Ultramarathon club. It's where all the cool kids are.

Send this to someone who you think it's about time did an ultra!

https://www.challenge-running.com/

Photos from Challenge Running Ltd's post 05/08/2026

Here are the answers to some of our more common questions!

If you have any other questions, head to our website where there is a wealth of information or send a message and we'll get back to you!

Photos from Challenge Running Ltd's post 05/08/2026

Here are our races in all their glory.

There's something for everyone from those doing their first ultra to the seasoned pros.

Head to the bio and click on our website for more details and entries for each race.

Photos from Challenge Running Ltd's post 05/08/2026

What is Challenge Running?

Have a flick through and see!

Look at the next pinned post for information about our races.

Make sure you head to the website link in the bio to read more about each of our races and for entries!

05/08/2026

"I'M NOT DEAD YET!" - said by every runner, every lap.... Until the exact moment they are.

THETFORD BACKYARD ULTRA FESTIVAL!!

4.167 miles, every hour, on the hour, forever until you cannot do it again, then you do it once more out of spite anyway before the DNF cart makes it collections.

The full event is perfect for the Black Knights among us who will continue after but a flesh wound.

If you're more of a Brave Sir Robin and want to be able to bravely run away, our 6 and 12 hour events are perfect for you to dip your toe into the events but leave with your limbs intact!

Maybe I should make the whole event Monty Python themed while Lindley's away? 🤔 Any ideas... Swapping the entrants fee for a shrubbery?

12th September! Join us!!!

https://www.challenge-running.com/e/thetford-back-yard-ultra-11505

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Location

Address


Suite 108, Communications House
Colchester
CO27NN