Challenging participants to push their limits
Threshold Sports organise epic endurance events across the UK, focusing on challenging participants to push their limits - their moto is 'We believe More Is In You'. Their main events include:
- Threshold Trail Series - weekend-long ultramarathons in spectacular British landscapes with distances from 50km to 100km.
- Endure24 - 24-hour trail races held in Reading and Leeds where participants complete as many 8km laps as possible within the time limit.
Events cater to a wide range of participants, from first-timers to experienced athletes, emphasising inclusivity and personal achievement.
Threshold Trail Series
Looking for an ultra run in epic scenery? You've come to exactly the right place!

- Sat 21 Jun
- £80-£180
Race to the King
Conquer a challenge fit for royalty through the heart of Sussex in this epic ultramarathon along the South Downs Way and Monarch’s Way. Choose from two unique 50km loops – or tackle both in a 100km!
- 100K ultra run
- 50K ultra run 2

- Sat 12 - Sun 13 Jul
- £85-£270
Race to the Stones
Conquer Britain's oldest trail, the ancient Ridgeway, at the UK's biggest ultramarathon as you race towards the 5000-year-old Avebury Standing Stones. Back for the 12th Year Running!
- 50K ultra run 2
- 100K ultra run 3
Fixed time runs
How far can you run in 24 hours? It's time to find out.

- Sat 7 - Sun 8 Jun
- £85-£120
Endure24 | Reading
The UK’s favourite 24-hour trail race! Epic, Brutal, Relentless. Race against the clock to tackle as many laps of the iconic course as you can. How far can you go in 24 hours?
- 24 hrs multi terrain running

- Sat 28 - Sun 29 Jun
- £85-£120
Endure24 | Leeds
The north's favourite 24-hour trail race! Epic, Brutal, Relentless. Race against the clock to tackle as many laps of the iconic course as you can. How far can you go in 24 hours?
- 24 hrs multi terrain running