This is the entry for the Twelve in Twelve (TiT) race series.

In the spring of 2026 Phoenix Running & Global Marathon Challenges are returning yet again with our very popular Ten in Ten (TiT) and Twelve in Twelve (TweT) run series; the Ten in Ten is to be held from Saturday 28^th March 2026 through to Easter Monday 6^st April 2026; the Twelve in Twelve is to be held from Thursday 26^th March to Easter Monday 6^th April so that both events finish on the same date with a huge party atmosphere. Yet again in 2026 we are offering the ability to -DOUBLE-Down- at HALF Marathon distance and complete a series of 20 or 24 consecutive HALF Marathons held over the 10 or 12 consecutive days where you run TWO Half Marathons each day. In 2025 it was the UK's biggest multiday running event and in 2026 we're aiming to make it even bigger and better than ever!

Easter Special.

Massive £100 off the TiT & TweT entry fee until 30th April 2025.

Monstrous £150 off the Double-Down entry fee until 30th April 2025.

Entry includes a bespoke GMC Finishers t-shirt actually presented to you at the finish line, plus, of course an epic set of medals.

No Medal / No T-Shirt entry option also available.            

As the name(s) suggests this is a series of 10 or 12 consecutive running events held over 10 or 12 consecutive days where you choose - from 5km to 10k, half to marathon to ultra, you can complete as many, or as few, laps as you like each day. The laps will be based around our standard 5.3km, 3.28 mile, out and back, series of routes along the beautiful River Thames and are held on UKA/IAAF measured and certified routes. The runs are 5, 6, 7 or even 9 hour timed events, dependant on distance entered. We offer super-early starts from just after 6am so if you take advantage of these you can get up to 9 hours of run time. We welcome absolutely all abilities of runner - complete one lap on any day and you're both a finisher for that day and a winner in our eyes, or keep going and see how far you can go in the full time limit. Then come back and do it all over again and again and again.            

The Phoenix Ten in Ten & Twelve in Twelve 2026 series will be based from our Thames Path location in Walton on Thames (postcode KT12 2JB) where the Weir Pub (right on the start finish line) lays on a special daily 'runners breakfast' and there are plenty of accommodation options nearby. We use two routes from this location for the TiT & TweT and we plan to alternate the route day-to-day to mix things up a bit. Our aid station or 'tuck shop' is famous for all its sweet and savoury goodies and CAKE and it will be back in full force in 2026 so you won't go hungry!            

There are other 10in10's and multi-day series, so what makes the Phoenix TIT & TweT so special?            

Well, as we hope you've come to expect from us, we're going to be doing something rather special and unique to us on the 'bling' front. Yet again we've gone all out on the bling and are inviting you to unlock your running potential by earning a set of Phoenix Treasure Chest medals.            

For those looking to complete all 10 days or 12 days we've got a beautiful set of Phoenix ' Treasure Chests' for you. These are, of course, our usual BIG and bold bling (goes without saying really that we wouldn't compromise on the bling) but this time they're 3D with translucent glass insets, and the ribbons have Velcro joins so they can be easily removed. Each day you get a different coloured Phoenix Treasure Chest representing a different part of your 10in10 or 12in12 and taking you on a personal running journey.

• Day 1 - The Silver Treasure Chest
• Day 2 - The Golden Treasure Chest
• Day 3 - The Fortitude Treasure Chest
• Day 4 - The Gauntlet Treasure Chest
• Day 5 - The Dauntless Treasure Chest
• Day 6 - The Resolute Treasure Chest
• Day 7 - The Perseverance Treasure Chest
• Day 8 - The Adversity Treasure Chest
• Day 9 - The Intrepid Treasure Chest
• Day 10 - The Indomitable Treasure Chest
• Day 11 - The Unbreakable Treasure Chest
• Day 12 - The Invincible Treasure Chest

What do all the Treasure Chests look like on their ribbons?            

What else do I get?
Oh and did we mention that all TiT & TweT finishers in the Half-Marathon, Marathon and Ultra Marathon Categories get a FREE Global Marathon Challenges 10in10 or 12in12 Technical Finishers T-Shirt - because you've earned it!
Or, if you finish all 10 or 12 days in a another distance, such as 5km or 10km, or indeed a mixture of distances then you get a FREE Global Marathon Challengers 'black' Technical Finishers T-Shirt - because you've also earned it!

Please Note - if you sign up to the 'No Medal/No T-Shirt' entry option then a finishers t-shirt is not included, however you can still order one through us.


What are the distance options and associated time limits for each?
As part of the sign up process to enter our Ten in Ten or Twelve in Twelve you will be asked to from the following four options for your chosen distance;            

 

• Half Marathon - 5 hour time limit (hard cut off)
• Marathon - 7 hour time limit (hard cut off)
• Ultra Marathon - 7 to 9 hour time limit (hard cut off)
• Timed event (mixed distances) - 7 to 9 hour time limit (hard cut off).

This is so we know what distance you are intending to complete so we can look after you accordingly and also what tech-shirt we should expect to give you.            

Please note: You can change distances if you change your mind, even on the day itself. Just let us know so we can monitor you against the right cut off.           


But what if I want to do some days but not all the days?
That is absolutely fine - any day can be entered as a single / separate event and you can do whichever days you want.            

Will there be route maps?
Yes, here are our two main route maps.            

Westbound Route            

Eastbound Route            

What do the Treasure Chests mean?
The short answer is that they mean you are awesome and the long answer is as follows;         
 

 

Day 1 - The Silver Treasure Chest

 

Day 2 - The Golden Treasure Chest

 

Day 3 - The Fortitude Chest


Day 4 - The Gauntlet Treasure Chest            

Day 5 - The Dauntless Treasure Chest            

Day 6 - The Resolute Treasure Chest            

Day 7 - The Perseverance Treasure Chest            

Day 8 - The Adversity Treasure Chest            

Day 9 - The Intrepid Treasure Chest            

Day 10 - The Indomitable Treasure Chest            

Day 11 - The Unbreakable Treasure Chest            

Day 12 - The Invincible Treasure Chest            

Places will be strictly limited so don't leave it too late to enter.            

Minimum distance is 3.28 miles or as far as you can go in 7 to 9 hours. Off road trail, the terrain is riverside towpath. The overall course has no elevation gain / loss making this a flat and fast route.

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Please note, as per UK Athletics rules, distance restrictions apply to participants ages 20 or under, for more information please read our full terms & conditions available here - https://www.phoenixrunning.co.uk/tandc

We provide a physical running service and by entering our events you are purchasing an actual run, either by attending our events or by running the event virtually yourself. All participants in our events, both attended and virtual, will receive a free giveaway medal / memento from your run.