Support us Fundraising events Trailwalker 100km The UKs ultimate team endurance event Trailwalker is the ultimate team endurance event. The challenge is to walk 100km (the same as 2.5 marathons back-to-back) across the South Downs Way in under 30 hours in a team of four, with a support crew of two members to help you get to the finish line. Originally a military training exercise devised by the Queen's Gurkha Signals, Trailwalker is a unique opportunity to put your mind and body to the test. Support me as I embark on this challenge, walking through the night and over mixed terrain with a total evaluation of 2,500 metres (the equivalent of Ben Nevis and Snowdon combined). Wish me luck. Sarah To sponsor me, click here. Booking for this event has now closed.