Relentless: seven marathons, seven continents, seven days

Introduction: The story of the beginning

The starting line

Marathon 1: Antarctica. Union Glacier: a trial by fire in the coldest place on Earth

Marathon 2: South America. Punta Arenas, Chile: the shakedown

Marathon 3: North America. Miami, United States of America: the forging of the alliance

Marathon 4: Europe. Madrid, Spain: the painful test

Marathon 5: Africa. Marrakech, Morocco: the unraveling

Marathon 6: Asia. Dubai, United Arab Emirates: when to win alone would have been a loss

Marathon 7: Oceania. Sydney, Australia: the final showdown.