What is It 

Spanning a time frame of 70 Days. Runners will have between December 25th 2025 and March 4th 2026 to take on their chosen distance.

50 Miles (5 miles per week)
100 Miles (10 miles per week)
200 Miles (20 miles per week/ The equivalent of the 50 Mile Grand Slam)
300 Miles (30 miles per week)
400 Miles (40 miles per week/ The equivalent of our 100 Mile Grand Slam)
500 Miles (50 miles per week)
600 Miles (60 miles per week/ The equivalent of our Double Slam)
1000 Miles (100 miles per week)

All you have to do is run whenever and wherever you like, then submit your distance to the database. You can do this automatically, by syncing your entry with strava or by just manually entering how far you ran, each time you do so. The system will then calculate your total distance and update both the results table and your position on our virtual map. It will add together your cumulative run distance only. 

The results for each event will show in order of cumulative distance only. Remember this is not a race, the primary objective is to complete the challenge you set for yourself and to engage with your friends, family and the Centurion Community by sharing your journey. 

Kids and Canicross

Kids can enter and compete on bike or scooter if they wish.

You can also register for the canicross event - Simply select 'yes' during registration to 'running with a dog?' and you will appear in your age group but also the canicross category (medals are not provided for our canine friends but you can give them your one!).

Free Coaching Webinars

We also want this to give you all the best possible start to your 2026 season, to learn about your training and improve your running in the process. To compliment this, we will be holding fornightly coaching webinars on Zoom - open to all entrants. These will be led by Robbie Britton our Head of Endurance at Centurion and some will also feature other members of our coaching team. The first one will take place on just prior to the event and will be open to everyone including non-Slam runners. After that, links to the webinars will only be shared with entrants to the event. Topics covered will be around central themes (TBC) but in the past these have included:

• One Slam Success: Reaching your goals with lessons from last year.
• Training Wisdom: Crafting your own ultra-training plan.
• Mental Grit: Sports Psychology skills for ultra-marathon resilienceNo such thing as bad weather: Choosing the right kit for your adventures
• One Community! Advice for those taking on the One Community Week - which distances to choose and how to approach longer self-supported journeys.
• No such thing as bad weather: Choosing the right kit for your adventures
• Fuelling Excellence: Nutrition strategies for ultra-runners in training and racing.

All of the sessions will be conducted via zoom. Links and meeting details will be shared in the pre-race mail outs and in the lead up to each one.

One Community Week

We will also be holding a One Community week from February 17th - February 23rd. This is optional, free with your One Slam entry and comes with its own set of awards that will be sent out to all finishers.

Centurion Running One Community is a virtual event which takes place over 7 days, starting at 0001 GMT on Monday 17th February 2026 and ending at 2359 on Sunday 23rd February. The event is for everybody, anywhere in the world, of any age. 

You can select any of the target distances you wish from the below, and run that distance in one go, or cumulatively, over the course of the week.

You may submit results in any format via the results page which will appear in the lead up to the race. Enter the time and day on which you started your first run, and then the finish time of your final run. If you do the distance in one go, then the start and finish time of that one run. The system will then calculate your overall time.

• 5km
• 10km
• Half Marathon
• Marathon
• 50km
• 50 mile
• 100km
• 100 mile

The results will show in order of cumulative time, and by category. Categories include gender and age groups. However the primary objective is to complete the challenge you set for yourself and to engage with your friends, family and the Centurion Community by sharing your journey along the way. Age Categories are available all the way from Under 5's to Vet 90 (aside from the 100 mile where categories will be senior and up only

What You Get with your One Slam Entry

• Personal Bib Number - downloadable by clicking on your race number on the Entrants page here
• Live updates to your progress throughout the event via the Leaderboard
• The option to compete in the One Community Week at No extra cost - with it's own leaderboard and awards (medals and buckles) sent out to you on completion.
• One Slam Medal sent to you in the post once you complete your event - this will be a large metal medal (100mm wide) pictured below, with the event logo. The ribbon will be a blue woven ribbon as shown, with your completed race distance and our logo.
• Fortnightly webinars from our coaching team, headed by Robbie Britton and our team of coaches, on subjects such as training, nutrition, kit, racing and more. As well as open time for questions after each.
• If you complete the 1000 mile distance on foot, you will receive a huge buckle for your efforts. 150mm wide.
• You can opt out of receiving the medal or buckle during the registration process, in favour of planting a tree with trees not tees
• Spot prizes for best posts/ photos/ interactions via social media/ email and the hashtag #centurioncommunity 
• 10% of all entry fees will go to our charity partner Protect Our Winters (Charity no. SC047595) This is something we have always done for our virtual events.

How to Register 

You can register by clicking on the button linked at the top of this page. Registrations are open until the final minutes of the event, so you can join in at any time and count any mileage you have already accumulated after the start of the event.

The event is open to everybody no matter your age or location. We hope to see many international runners taking part. 

You can also register for the canicross event - Simply select 'yes' during registration to 'running with a dog?' and you will appear in your age group but also the canicross category.

When you sign up you will need to include a shipping address. We will then post out your medal or buckle to you when the event finishes.

Entry Fee

Entry fees are the same as for all previous editions.

• £30 Early Bird for Adults up to 31st August. £40 thereafter.
• £15 for Under 18s