Ben Fogle takes on an urban-assault course in London and swims in the treacherous waters surrounding Alcatraz in preparation for the Anaconda adventure race in Western Australia.

Ben tries to conquer his fear of heights by scaling a giant tree in California, abseiling into a glacier in Iceland and climbing to the summit of the Dolomite Mountains in Italy.

Ben pushes his body to the limit as he prepares to take part in a gruelling 24 hour bike race through the Moab desert in the US.

Ben embraces the thrill of speed when he flies in a fighter jet and races a hovercraft.

Ben faces his fear of heights by going on a solo skydive in Western Australia and rock climbing Utah's Castleton Tower with good friend Kate Humble.