One of the UK’s great endurance events. Most of the 3,000 challengers will walk it, some will jog parts, and nearly 500 will run it as a full on 100km ultra-marathon.
Since 1999 we've been organising group challenges across the world and have helped to raise over £50 million for charities. We're based in London, and work in 30 countries in partnerships with the best local operators along with our own teams of experienced challenge leaders and event staff.