As Keen As Mustard SwimRun

Updated November 2025

As Keen As Mustard SwimRun is a U.K. based SwimRun race organiser. This is a small family-run business aiming to promote the increasingly popular sport of SwimRun.

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As stated on their website:

“SwimRun is an adventure race with swim and run sections. The emphasis is on adventure . . .navigating a course through woods, paths and trails and using naturally occurring swim entry and exit points. There are no transitions, any kit you use you carry with you. The courses are signed and tape is used for you to follow the course. You need to be aware, self sufficient and be able to follow signs. It is an awesome experience which puts you in touch with nature and awakens the adventurer in you! ”

Inspired by the international ÖTILLÖ, ”Island to Island” races, As Keen As Mustard events follow the same rules and guidelines, with teams of 2 racing the entire course together, and individuals allowed for shorter distances.

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The usual swim aids are allowed - hand paddles, pull buoys, and wet suits - and any personal hydration and gels must be carried the entire race. Longer races require you to carry a folding or collapsible water cup for the water stations. It can make a real difference having the right team mate and equipment , as you can find out by reading other pages on this site!

As Keen As Mustard events also offer the opportunity to race as individuals as opposed to competing in teams of 2. If you are having trouble finding a race partner, this could be a way to actually take part in an event, and maybe meet up with a future SwimRun team mate!

Each event has an Intro race of 5km (Bewl Water event is 6km) - these races are excellent if you are new to Swimrun as introductory races to the sport. You can then progress to the longer distances.

Keen As Mustard Events
- The Races

There are currently 4 races in the As Keen As Mustard SwimRun Series, during June, July, September and October. Some dates have been set for 2026 and we'll update this page as we receive any new dates.

Races are held in:

Grafham Water, Cambridgeshire
Bewl Water, Tunbridge Wells, Kent

AND there is a training event at Sibson Lake.

The 2026 event dates are as follows:

31st May 2026 - Mustard Training and Kit Testing - Sibson Lake

NOT SCHEDULED IN 2026 - Nene Valley, Sibson Lake, Peterborough

29th June 2026 - Grafham Water, Huntingdon

7th June 2026 - Bewl Water, Tunbridge Wells

27th September 2026 - Grafham Water Survivor

Mustard Training and Kit Testing

swimrunner exiting the water wearing a green swim cap.

DATE: 31st May 2026

VENUE: Sibson Lake, Stibbington

This a training event, and a chance to test your gear at the start of the season. John from Fenland Runner will be there, with a selection of swimrun equipment from HEAD. There are morning and afternoon sessions available, and participants also get CAKE and a goodie bag!

For more information, and to register, click here.

Nene Valley Swimrun

DATE: NOT SCHEDULED IN 2026

VENUE: Nene Valley, Peterborough, Cambridgeshire.

Intro; 5k Solo Swimrun

Mild Mustard Sprint; 10k Solo Swimrun

Middling Mustard Half; 21k Solo Swimrun

Middling Mustard Half; 21k Team Swimrun

Hot Mustard; 31k Solo Swimrun

Hot Mustard; 31k Team Swimrun

For further information and to enter CLICK HERE

Grafham Water SwimRun

swimrunners about to enter water through trees

Swim entry point through the trees!

DATE: 28th June, 2026

VENUE: Grafham Water, Grafham, Cambridgeshire

Intro 5k solo Swimrun

Mild Mustard Sprint; 10k Solo Swimrun

Middling Mustard Half; 21k Solo Swimrun

Middling Mustard Half; 21k Team Swimrun

Further information at our event info Grafham Water page.

Bewl Water SwimRun

Water exit at Bewl Water, Tunbridge Wells

DATE: Sunday, 7th June 2026

VENUE: Bewl Water, Tunbridge Wells, Kent

Intro 6k; Solo Swimrun

Mild Mustard Sprint; 10k Solo Swimrun

Middling Mustard Half; 21k Solo Swimrun

Middling Mustard Half; 21k Team Swimrun

For further information at our event info Bewl Water page.

As Keen As Mustard Events

Grafham Water Swimrun Survivor

DATE: Sunday 27th September 2026

VENUE: Grafham Water, Huntingdon.

This is an interesting and exciting format for swimrun - it's basically "last man standing"!

According to the As Keen As Mustard website;

It starts with "a 2.5 km lap, with 2 swims and 3 runs on and around Grafham Water and an ever decreasing time limit to each lap.

Each lap has a start time and finish time. Take it easy to begin with, the first few laps give you plenty of time to complete them at a leisurely pace, but as laps go on, the pressure builds as the time allowed gets shorter. Complete as many laps as you can before the time beats you ... there will be one Survivor, the last person standing!"

Further information at our event info Grafham Water Survivor page.