Best friends Joel Dommett and Nish Kumar travel to locations across the globe to immerse themselves in the lives of the toughest, strongest, fittest people in the world.

Guillaume Dulude, doctor of neuropsychology, sets out to find the last nomadic tribes in the world in an effort to understand how they manage to survive while retaining their traditional way of life.

Sue Perkins experiences the modern phenomenon of #vanlife in the USA, as she campervans across California and Colorado to discover the highs and lows of life on the road.

When she was a child, Kate Humble wanted to be a nomad. Living in some of the world's most remote wildernesses, cheek by jowl with nature, seemed like such a wildly romantic existence.