Martin Strel looks like your typical middle-aged bloke. He likes a laugh, a drink and the sight of a pretty woman. But put him in water and he turns into a swimming machine.In April 2007, after 66 days, he became the first person to swim the Amazon, 3,272 miles from the Peruvian Andes to the Atlantic shores of Brazil. On this extraordinary journey he dodged piranhas, sharks and river pirates, met indigenous tribes who either revered him as a god or chased him with machetes, and swam from dawn to dusk for 60 miles every single day. Like pioneers before him who first climbed Everest or explored the poles, Martin shifted the limits of human capability.His story - of endurance, of determination, of dehydration and exhaustion, of illness and blood pressure that reached heart-attack levels - is an inspiration to people everywhere.