A modular exercise apparatus comprising a frame, a common drivetrain supported by the frame and including a common axle, a plurality of input receivers coupled to the common axle, and a resistance member operably coupled to the common axle and operable to provide resistance against rotation of the common axle, a first exercise attachment including a first drive member operably coupled to a first input receiver of the plurality of input receivers of the common drivetrain, and a second exercise attachment including a second drive member operably coupled to a second input receiver of the plurality of input receivers of the common drivetrain.