Abstract: A stability adjustable unit for a seat of an exercise device that is configured for movement on the device may include a sub-assembly connected between the seat and a roller assembly of the device on which the seat rests. The unit may include a selector provided on the sub-assembly and operable by a user seated on the seat to vary a degree of stability of the seat.

Abstract: An exercise device in which removable weight may be provided in a housing of the device. Two rotatable handles may be provided in the housing, permitting various hand orientations during exercise. The removable weight may be received within and/or removed from a cavity of the device.

Abstract: An exercise device, method of making the device and a method and system for interaction with an exercise device, in which removable, variable weight may be provided in a housing of the device. Two rotatable handles may be provided in the housing, permitting various hand orientations during exercise. The removable weight may be provided near the center of the exercise device, with the handles substantially outboard the weight. Weight may thus be efficiently added or removed in a central area of the housing between the handles.