Exercise machine (9)
(Other definitions for appliance that I've seen before include "Machine, piece of equipment" , "food mixer, perhaps" , "Domestic machine" , "Washing machine or toaster, say" , "Machine (for use in the home)" .)
(Other definitions for treadmill that I've seen before include "Boring routine; old rotary device" , "Wearisome routine" , "Piece of gym equipment" , "Form of torture" , "It enables one to work out" .)