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15th April 2024

The legendary Arc of Attrition in Cornwall, England joins the UTMB World Series in 2025

For the new 2025 season, the not-to-be-missed trail event in the UK, Arc of Attrition joins UTMB® World Series calendar on January 24-26, 2025, to become Arc of Attrition by UTMB®. The event will remain close to its Cornish roots and spiritand will again be set in the stunning landscapes of Cornwall, South West England. The community of trail runners in Cornwall and the South West is strong and hugely passionate, and with the partnership with UTMB World Series, the event will continue to embody the spirit, community and brand that has become the MudCrew Arc of Attrition.

Founded by the visionary MudCrew trio Jane Stephens, Andy Trudgian, and Andrew Ferguson, known as Andy, Jane, and Fergy, Arc of Attrition by UTMB has become a legendary fixture in the UK winter ultra-trail running calendar. MudCrew, a company renowned for its meticulously planned and well-executed events which have brought to Arc of Attrition by UTMB its success, will continue to organise and run the race to ensure the inaugural edition's success. Their decision to join forces with the UTMB World Series originates from a shared commitment to delivering an exceptional and challenging running experience with strong identity and history.

Andrew Ferguson, Andy Trudgian and Jane Stephens

MudCrew's trio, Jane, Andy, and Fergy, said: “We are thrilled to be working with the team at UTMB World Series. The local running community is really important to us and the Arc Angels are key to the success of the event. We will endeavour to maintain the Cornish culture and deep community spirit that the Arc of Attrition is known for with our continued involvement during these exciting times.”

Arc of Attrition by UTMB embodies the spirit of endurance and community. Set amidst the cold and dark winter months, it holds a special place in the hearts of runners for its emotional resonance, challenging conditions, and the pride that comes with finishing. The event's collaboration with UTMB World Series won't change its original essence and qualities, runners will be able to come to face its hallmark difficulties, including harsh weather conditions and demanding cutoffs, enhancing its prestige.

Hayden Arrowsmith, Event Director at UTMB UK will be leading the development with MudCrew. Florian Lamblin, Executive Director - UTMB International, added: “We are extremely pleased to welcome Arc of Attrition by UTMB and its founders, Andy, Jane and Fergy, to the UTMB World Series. Arc of Attrition by UTMB is a mythical event with a reputation for difficulty, and which showcases a sumptuous region - Cornwall, which we will endeavour to develop while respecting its identity and local roots.”

The event offers a unique challenge that starts and finishes in the iconic locations of Coverack and Porthtowan, respectively, with additional starts at Porthcurno and St Ives. Adding to the existing Arc of Attrition 100 mile (100M) and Arc 50 mile (100K) races, a new 25 mile (50K) race will be introduced in 2025. The three courses follow parts of the Cornish Coast Path, the longest of England's National Trails, around the picturesque arc of Cornwall in Southwest England. The terrain is technical with 4,200 metres elevation gain on the 100M course and the weather in the UK in January, often wet, muddy and wild, certainly adds to the event's challenge.

The addition of Arc of Attrition by UTMB to UTMB World Series, composed with 43 Events all over the world in 2025,responds to the growing demand from UK trail communities for a second UTMB World Series event close to their home, complementing Ultra-Trail Snowdonia by UTMB® in May. It also occupies a unique position in UTMB World Series calendar as the only event in January and the sole European event between November and March, enhancing the Series' presence in the UK and offering a new challenge to the strong local running communities in Cornwall, Devon, and Dorset.

Registrations open: 30th April 10:00 UK Time (11:00 CET) UTMB Index Priority 2nd May 10:00 UK Time (11:00 CET) General Release For more information about Arc of Attrition by UTMB, please visit

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