The Chiltern 50 Ultra Challenge covers some of the best of the Chilterns countryside. You can walk, jog or run along historic trails and over rolling hills.

Expect a great atmosphere, full support from our team, and free food and drink at regular rest stops. You'll start and finish at our Base Camp in Henley Showground. We will host a Saturday night celebration BBQ and entertainment with camping options.

Choose from the 50km, 25km or 10km challenge.

As Macmillan are an official partner on this event, you get a 50% discount on the 'Full Sponsorship' registration fee when signing up to support us. Head to the Macmillan Ultra Challenge page to find out full details of prices and to sign up.

All distance options have Charity, Mixed Funding or Own Place Fundraising for Charity options.

We'll provide you with a reason to keep going because you'll know that you're helping improve the lives of people living with cancer. 

Donations make up 98% of our annual income so we simply couldn't do what we do without you.

For full information on this challenge, please visit the Macmillan Cancer Support Ultra landing page. You can also find FAQs here, or contact the Action Challenge event organisers directly

Please make sure you have read our Terms and Conditions before signing up.

Each Action Challenge Ultra Series event covers different terrain and landscapes, including steep climbs and descents, stiles, and uneven pathways subject to weather effects. 

If you have any queries about the route, or have any special requirements to consider that you wish to chat through further before registering, please do not hesitate to contact the Action Challenge Team who will be happy to discuss course suitability. 

By joining us you'll know that you're helping improve the lives of people living with cancer in the UK today.