An exercise cycle assembly that detachably connects to a chair frame. The exercise cycle assembly includes a main frame having a first end portion detachably connectable to a frame element of a chair frame. The main frame includes support legs for supporting the exercise cycle assembly relative to the floor; and, a pedal assembly securely connected to the main frame. The first end portion preferably includes an elongated connecting member having a generally unshaped cross-section for engagement with the frame element of the chair. Generally, it connects to a horizontal crossbar of the chair.