Gravity treadmills were exercising machines, used for walking or running while staying in the same place. One such model was the GRGC-800. Warning: The following section is non-canon within the Star Wars Legends continuity. It contains information explicitly released under the Infinities brand and/or confirmed to be non-canon by the author or Lucasfilm. Information exclusive to this section did not happen in the "proper" Star Wars Legends continuity. The DS-1 Orbital Battle Station, better known as the First Death Star, had a couple of grav mills at the Workout Center for its residents to use. Non-canon information ends here.