In 2003, who completed seven marathons in seven days on seven continents?

Sir Ranulph Twisleton-Wykeham-Fiennes, 3rd Baronet (born 7 March 1944), commonly known as Sir Ranulph Fiennes, is a British explorer and holder of several endurance records. He is also a writer and poet.

Despite suffering from a heart attack and undergoing a double coronary artery bypass operation just four months before, Fiennes joined Mike Stroud (physician and friend) in 2003 to complete seven marathons in seven days on seven continents in the Land Rover 7x7x7 Challenge for the British Heart Foundation. "In retrospect I wouldn't have done it. I wouldn't do it again. It was Mike Stroud's idea". Their series of marathons was as follows:

26 October – Race 1: Patagonia - South America

27 October – Race 2: Falkland Islands - "Antarctica"

28 October – Race 3: Sydney - Australia

29 October – Race 4: Singapore - Asia

30 October – Race 5: London - Europe

31 October – Race 6: Cairo - Africa

1 November – Race 7: New York City - North America

Speaking after the event, Fiennes said the Singapore Marathon had been by far the most difficult because of high humidity and pollution. He also said his cardiac surgeon had approved the marathons, providing his heart-rate did not exceed 130 beats per minute. Fiennes later said that he forgot to pack his heart-rate monitor, and therefore did not know how fast his heart was beating.