Are pointless challenges heroic? A British man has completed the undertaking of a lifetime: an 8,000-mile journey from Dover to the Himalayas. Some call it an act of heroism.
World’s longest triathlon completed
Project Limitless: Ex-marine Mitch Hutchcraft (above) hopes to raise £500,000 for a London-based charity that uses animals and nature to provide mental health support to military veterans. Glossary
George Mallory - An English mountaineer who attempted to be the first to scale Mount Everest in 1924, alongside Andrew Irvine. Both died during the attempt, although their bodies were not found until 1999. It is not known whether they reached the summit before their deaths.
Mount Everest - The world's tallest mountain, which straddles the borders of Nepal and China. Temperatures can drop to -60C. The first known people to climb the mountain were New Zealand's Edmund Hillary and the Sherpa, Tenzing Norgay.
Triathlon - A sporting event consisting of three separate contests, usually swimming, cycling and running. The word derives from the Greek words for "three", treis, and "competition", athlos.