Arc of Attrition by UTMB® is one of the UK's most iconic coastal ultra marathons, taking runners along the spectacular South West Coast Path through some of Cornwall's most dramatic landscapes.

Taking place in January, the Arc 100, Arc 50, Arc 25 and Arc 12 challenge competitors with rugged cliff paths, relentless climbs and unpredictable winter conditions.

Since its launch in 2015, the Arc of Attrition has grown from a single 100-mile race with 50 runners into one of the UK's largest and most sought-after trail running events. Whether you're chasing your first trail challenge or tackling the full 100-mile ultra marathon, there's an Arc distance waiting for you.