The World Marathon Challenge. The ultimate race for adventurous runners. What does it take to run seven marathons on seven continents in seven days, set two new world records, and win the entire race overall? How do you cope with biting cold Arctic conditions one day, searing hot the next? How do you survive, mentally and physically, the onslaught of sensations?fears, fatigue, depression, elation?that threaten to overwhelm you? What does it take to...