NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Exercise bike. Astronaut Jerry L. Ross exercises on a bicycle ergometer on the mid-deck of the Space Shuttle Atlantis whilst in Earth-orbit. Exercising muscles is important for astronauts because their weightlessness means that they are otherwise not used much. Muscles which are not used will tend to waste away. A similar process happens in the bones of astronauts who spend a long time in gravity-free environment. Photograph taken on Mission STS-74, during which Atlantis docked with the Russian space station Mir from 15 November to 18 November 1995 in order to deliver a new docking module and other logistical supplies.
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