An exercising device has a flexible tension member connected to a user interface that is connected to a mechanism for generating a resistive force which is overcome by the user moving the user interface to obtain exercise. The exercising device has a driving member rotating about a first axis and a circular oscillating surface rotatably connected to the driving member to circle about the first axis while also rotating about a second substantially parallel axis through the center of the circular oscillating surface. The first and second axes are offset a distance d. The flexible member wraps at least part way around the circular oscillating surface to rotate the oscillating surface as the user interface moves during use of the exercise device. The offset d provides an oscillatory motion to the user interface to increase the effectiveness of the exercise.