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The XNRG Chiltern Challenge Ultra, 19th July 2025.

Take on a 50km Ultra, a 25km, or a 10km race through the stunning Chiltern Hills—all in support of life-changing operations for children in developing countries.
What to wear for your first ultra

One of Our Most Popular Fundraising Events of The Year

Take on a 50km Ultra, a 25km, or a 10km race through the stunning Chiltern Hills—all in support of life-changing operations for children in developing countries.

Donate to Race!

Join XNRG’s Humanity Direct Ultra and make a difference. Instead of paying an entry fee, donate the equivalent amount or pledge to raise as much as you can for this vital cause.

Why We Do It

Last year, Humanity Direct raised an incredible £24,000 through the three Humanity Direct Ultras, funding life-saving and life-changing surgeries for 35 children. This year, we’re aiming even higher!

How It Works

It’s simple. Skip the entry fee and either donate the same amount to fund a vital operation or set up a fundraising page to raise as much as possible, with a minimum target equal to the entry fee.

Together, let’s make 2025 a year of positive change—one step at a time.

Find Out More
1
£ raised through our ultras
1 km
Choose between a 10km, 25km or 50km type marathon
1 %
of donations go to children’s operations in Africa with Humanity Direct

Places for this event go fast!

Join the Humanity Direct Ultra and know that 100% of donations go directly to funding life-saving surgeries for children in Africa.

The 50km race is the perfect introduction to ultra marathon running. Set in the breathtaking Chilterns—an Area of Outstanding Natural Beauty—this event offers an ideal, supportive environment for first-time ultra runners, all within easy reach of London.

At the Chiltern Challenge, we take care of all the details so you can focus on the journey. Enjoy:

  • Transfers from the station
  • Free Parking
  • Complimentary event photos
  • Changing facilities
  • Plenty of tea and cake to fuel your adventure

Escape to the Chilterns and take on a race that truly makes a difference!

Entries

Entries will close one week before the event (or when full). A waitlist option will be available if the event becomes fully booked.

Start / Finish

Start and finish: Princes Risborough School, HP27 0DR

Enter Now
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Get in touch

If you have any questions or if you wish to speak to us further please feel free to contact us.

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