In this brand new adventure challenge series, ordinary members of the public participate in some of the world's most extreme endurance races, in amazing locations, with only 12 weeks to prepare. Groups including doctors, members of the Women's Institute and pub landlords are involved, but they will have to make a serious commitment and huge changes to their lives even to be allowed to take part. Their trainer and the person behind this hugely ambitious idea is Hannah White, who knows all about endurance challenges, having sailed the Atlantic three times solo. She is also a competitive long-distance cyclist, mountain biker and runner.