Adventure races involve a combination of activities (such as running, mountain biking, paddling, swimming) as well as various skills (like navigation and orienteering).
They can vary markedly in length - anything from a couple of hours up to several days, when there's the added complexity of when and where to rest.
The main categories are below, along with more details of what's involved.
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Inspired by the London Marathon? Now's the time to start training for the 2018 Race!
It's Easter and we highlight some ideas for weekend warriors in 2017 as well as the best events to go and support them.
Go the distance with these extreme runs, rides, walks and triathlons in the UK and around the world.
Is this the ultimate year-round multi-activity destination?
Things to do in an urban environment - everything from city walks to traffic-free rides.
Trek Ladakh - 17 August
Kinabalu Rainforest Trek
Finland - 13 January 2018
London Bridges Challenge - 1 October
Streak for Tigers - ZSL London Zoo
Ibiza to Barcelona - 26 July
82 miles - 3 June
Sittingbourne to Eltham - or vice versa
13 May - Snowdon 500
Tailor made training sessions in Cyprus