The stirring story of a 35-year-old adventurer who decides to sell his share of his business to his partner for £1 and undertake an incredible, some might say insane, ultra triathlon, circumnavigating Great Britain in 85 days.

Zimbabwean Sean Conway is one of those people we look at with awe, but also bewilderment. What drives a man to cycle 3,200 miles, run 820 miles and swim 120 miles around a country’s entire coastline? Discovery Channel filmed him all the way around his challenge in this window into the extremes of human motivation. Go Sean go!

Part one of three episodes.