An exercise device including a first monoarm treadle assembly supporting a first tread belt and a second monoarm treadle assembly supporting a second belt. The tread belt is supported on a tread deck between a front roller on each treadle assembly, and a rear roller, which may be a distinct rear roller on each treadle assembly or a single rear roller for both treadle assemblies. The monoarm structure of each treadle assembly supports a plurality of deck supports in a cantilever fashion. The treadmill deck and the belt are supported on the deck supports. Further, the treadles are coupled with one or more hydraulic resistance structures, which may also function as an interconnect structure to coordinate pivotal movement of the treadle assemblies.