#exercise_device  a device designed to provide exercise for the user
  supertype:  device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  subtype:  exercise_bike__exercycle  an exercise device resembling a stationary bike
  subtype:  treadmill  an exercise device consisting of an endless belt on which a person can walk or jog without changing place

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