The Arc of Attrition

Running (offroad)

  • Eastcliff, United Kingdom
  • 09. February, 2018
  • Rating:


  • 161 Km

161 Km Long
161 Km

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About the race

Become a legend by completing the South West’s toughest ever footrace.

The Arc of Attrition is an extreme winter 100 mile footrace with competitors running in challenging winter conditions.

The Arc is a point-to-point race from Coverack to Porthtowan taking in 100miles of stunning and dramatic Cornish Coastpath, and will complete an Arc around the entire south west foot of Cornwall. The race has a strict 36 hour cut-off with additional checkpoint cut-offs on route. With checkpoints approximately 20 miles apart, competitors will need the ability to be self-sufficient for long periods of time.

The event carries 4 points towards qualification to the UTMB in 2017.

As safety is our primary concern, competitors will need to carry mandatory kit at all times and will be subject to random kit checks throughout the event. We would strongly recommend and advise the use of your own support crew. The cost of entry is £120 (£125 unaffiliated), plus £25 for the use of a compulsory GPS tracking device which allows race HQ (and friends and family) to track your progress online.

The race starts at 12.00 noon on Friday 5th February 2016 and competitors will be bussed to the start area from the race HQ at the BlueBar Porthtowan

Although it follows a way-marked route, this is a self-navigation event and ONLY suitable for experienced ultrarunners. There is an entry requirement of at least a 100km finish and considerable experience of night time running. We reserve the right to refuse an entry if we believe you do not have the right level of experience to compete in this event safely. If this is the case we will refund any monies paid in full.

All competitors will receive an event hoodie at registration and all finishers will be awarded an exclusive and much coveted MudCrew 100mile buckle.

For further details, please see and download the event guide or you can contact us through social media.

Complete The Arc of Attrition and Become a Legend !


The Arc of Attrition

13 Review(s)

Review this race


Registration process

Race briefing


Quality of feed stations

Value for money


Natural beauty

Course uniqueness

Ease of navigation

Local support

Marshal supervision


Baumgartner Tilman

Completed as a first timer in 2017



Unfortunately suffered from some cold  and coughing and started anyway.

Everything is 5* with this race.

Absolutely advisable if you like the distance.

Will come and do ist next year.

Thanks to MUDCREW

Posted on 05.03.17

Reply from the race organiser

Look forward to seeing you next year!

Maryann Devally

Completed in 2017


Best Aid Stations Ever!

Wonderfully scenic & challenging route, amazing aid stations, incredible sense of achievement on completion especially after 2016 DNF! Can't recommend this race/ organisation highly enough. Although support crew is advised, I managed to complete it without although weather was dry but in wet conditions you might want a change of footwear! Support from Mudcrew was epic. 

Posted on 16.02.17

Reply from the race organiser

Thanks Maryann and congratulations on First Lady!

Andy Persson

Completed as a first timer in 2017


Taking 100 miles to another level

The Arc of Attrition is an amazing race of real character. Everything from the entertaining race briefing to the challenging and varied terrain make it an unforgettable experience. The stunning Cornish coastline makes up for the inevitably inclement weather and the extreme friendliness and attentiveness of the organisers and volunteers helps to ease the pain of running 100 miles with 4000m of climb. The added incentive of achieving the sub 30 hour gold buckle is a great feature that gives something else to aim for beyond simply completion, which is a massive achievement in itself. I can't recommend this event highly enough.

Posted on 14.02.17

Reply from the race organiser

Thanks Andy!

Stu Wilkie

Completed in 2017


Brutal but Rewarding

This was my first AoA and my fourth 100 mile race. I found it the hardest of the 100's and up there in the most the brutal of ultras ihad done. 

I hadn't recced the route before so was expecting to get lost at times. Most of route is easy to navigate but there were places that could be marked out but on reflection, these were probably unmarked because they would have been so hard to get to.

I would defo rate this race as brutal but so rewarding. I don't think anythink needs to be changed and if it does the organisers are probably aware of it anyway.


Thank you to all the Race Directors and team for putting on such a challenging yet rewarding ultra.

Posted on 14.02.17

Reply from the race organiser

Great comments Stu, thank you and well done.

Tim Cox

Completed in 2017


2-1 to me and i'll be back for year 4, love this race :-)

It's a coastal path winter endurance event. Pack all of the minimum kit and trust me you might need it all and then some more. Be thankful if you dont!

Organise crew if you can because several sections of this race mess you up. The cuts are tight and the gaps are long. It's a stern test for good reason. It is designed to be brutal. But you will be safe, big brother watches you and the aid is plenty adequate, infact outstanding if you get to it!

Don't underestimate the third quarter and beware of the sting in the tail. The course is Beauty and the Beast, the weather most likely Tempestuous or Biblical (a pre booked residency by Fergie for the Mennack). The terrain is energy sapping and awe inspiring in equal measures. And beware of PIRATES, SMUGGLERS AND MINES.

Bring your kit and your smile and the Arc Angels will deliver you from the Demons. Forget either and enter at your peril!

This event is outstanding, I can only say great things about  this event because it keeps getting better and there is nothing to parallel it. The people are quite nice too.

Where i grew up the saying was "cum'n ave a go if ya think yer ard enuff" 

Posted on 13.02.17

Reply from the race organiser

Thanks Tim! And a huge well done!

Steve Bradfield

Completed in 2017


Mudcrew's awsome 'Arc of Attrition'

Having done a good measure of 'events' in different parts of the country over many years including multi-day events I thought this 100 mile trip around the coastpath of Cornwall would be reasonable with the 36hrs allowed. Oh.. how little did I know . Having entered in 2016 and ended up with a DNF after about 60 miles and facing being timed out in a howling gale I had to admit defeat for the first time ever. As MudCrew state 'we don't do easy'.

So 2017 and round two . Not quite as bad weather but still 'testing' conditions  cold and sleet at times . The route .... amazing with stunning views and terrain that was as testing as mountain routes I've run.

The support..... amazing from the pre race brief , medical cover and of course the 'Arc Angels' support team. Every step of the way they provided all the help and encouragment you could wish for and by far the best event I have entered.

Oh... and I did finally finish in 2017 !

Thank you Mudcrew.

Posted on 13.02.17

Reply from the race organiser

Thank you Steve and huge congratulations!

Richard Stillion

Completed as a first timer in 2017


Brilliant! Difficult. Do it!

Only managed half of it.  I'll be back

Posted on 12.02.17

Reply from the race organiser

Half is good but see you next year to give you that buckle!

Owen Delaney

Completed as a first timer in 2017


6 stars

Singularly the hardest, but also the best event I've ever done. MudCrew made completing this possible for me, the support throughout was first class, and I honestly can't think of anything that can be improved upon. You guys put on a masterclass in event organisation. Thank you all. 

Posted on 12.02.17

Reply from the race organiser

Thank you for those comments and a massive well done from us!

Dan Milton

Completed in 2017


A bit of a stunner!

A beautiful, rugged and well organised event not for the feint hearted. Should be on every serious ultra runners bucket list.

Posted on 12.02.17

Reply from the race organiser

Great comments, thank you and well done!

Scotty Filmer

Completed as a first timer in 2017


The Best so far

The Arc of Attrition

just want to say that was my 14 Ultra race and a clear winner in all aspects. From when you arrive you are made very welcomed. The organisation was 100% fantastic and everything ran smoothly from the runners point of view.

All aid stations were of such a standard expected from such a high profile event (UTMB). All the Arc angels were there to get you anything at anytime, they were great and fab. 

Keep up the great work and I will be back next year to collect a second buckle. 

Posted on 12.02.17

Reply from the race organiser

Thank you for those comments, it means a great deal. And well done!

David Chetta

Completed in 2017


More chilli please.

Really well put together event, but there's always room for improvement:

Chilli con carne went down a treat, more of that at every aid station please, how about a bacon bap at St Ives in the morning too.  National Trust should update the path signs, many coastal paths have junctions with no acorn markers, also towns have very few markers and which can be difficult to wayfind.

Posted on 12.02.17

Reply from the race organiser

We will see what we can do about the food! We have less control over the acorns but have already discussed signage at the checkpoints.
Brilliant effort, well done!

Andy Goundry

Completed in 2017


WOW A real challenge.

one tough course fortunately in reasonable conditions although very cold through the night. Tight cut iff times and the very technical terrain make it not one for the faint hearted, but a definite challenge.

Superbly organised, supported and martialled with awesome checkpoints and feed stations.

Posted on 12.02.17

Reply from the race organiser

Thank you for the comments and for everything you did!

James Hartshorn

Completed in 2016



This race is simply fantastic! If you want an adventure and a tough challenge then sign up. Superb trail running across stunning Cornish coastline with the extra challenge of it being held in winter. MudCrew are brilliant, very well organised and help create a great vibe. This year we ran through a storm, last year it was sunny skies. This race has it all, beautiful coastal route with quaint towns, lighthouses, sand dunes the lot. Just don't expect it to be easy it's no ordinary 100 miler!

Posted on 09.02.16