Abstract: An exercise device is provided having a working arm structure which has its proximal end rotatably mounted to a frame. Exercise force is to be applied at the working arm's distal end to rotate the working arm during the positive stroke or resist the movement of the working arm during the negative stroke for each exercise repetition. An electro-hydraulic system provides a predetermined, substantially constant resistance to rotation of the working arm during such positive and negative strokes. This predetermined constant resistance is applied to the working arm at a fixed application point between the proximal and distal ends thereof, with the constant resistance being applied at the application point at an angle such that as the working arm is rotated, the angle changes to ensure the provision of a substantially proportional resistance to rotation of the working arm at the distal end.