Alastair Humphreys is a British adventurer, author and blogger. He spent over four years cycling round the world, a journey of 46,000 miles through 60 countries and five continents. More recently, Alastair has walked across southern India, rowed across the Atlantic Ocean, run six marathons through the Sahara desert, completed a crossing of Iceland, and participated in an expedition in the Arctic, close to the magnetic North Pole. He has trekked 1000 miles across the Empty Quarter desert and 120 miles round the M25 - one of his pioneering microadventures. He has written five books and was named as one of National Geographic's Adventurers of the year for 2012.