Ultra Challenge Series

UK’s No 1 Series of treks & trail runs! Take on a challenge at your pace and fundraise for Guts UK!

Whether along a stunning coastline or on trails through magnificent countryside, you’ll get full support all the way–including plenty of food & drink,medics & massage, camaraderie, a medal & T shirt – and an amazing sense of achievement.

With 20 events to choose from, and distance options ranging from 10km up to the full 100km–there’s an Ultra Challenge waiting for you in 2026 – take a look at the challenges available below.

London Winter Walk
Bath 50 Ultra Challenge
Windsor 50 Ultra Challenge 
Isle of Wight Ultra Challenge
Jurassic Coast Ultra Challenge
London to Brighton Ultra Challenge 
Lake District Ultra Challenge
Cotswold Way Ultra Challenge
North Yorkshire Ultra Challenge
Peak District Ultra Challenge
Gower Peninsula Ultra Challenge
South West Coast 50 Ultra Challenge 
North Downs 50 Ultra Challenge
London Summer Walk
South Coast Ultra Challenge
Thames Path Ultra Challenge
Thames Bridges Trek 
Thames Moonlight 10
Chiltern 50 Ultra Challenge
Kent Downs 50 Ultra Challenge
London Halloween Walk 

Why take part for Guts UK?

• Receive a free Guts UK top to wear during the event.
• Have exclusive access to our WhatsApp group to chat to all likeminded fundraisers.
• Join our Strava group.
• Dedicated support is on hand from our small but mighty fundraising team.
• Every pound you raise supports our vital work, which includes:
  • Providing information and support for those living with digestive conditions and symptoms.
  • Funding life-changing research into the whole digestive system.
  • Delivering public education and awareness campaigns and events.