An exercise machine includes a rocker pivotally attached to a base. Pins are attached to the bottom of the rocker. Pins are attached to the base. Tensioned elastic members each extend from a pin in the base to a pin attached to the bottom of the rocker. The elastic members assist or oppose each other depending on the position of the rocker. The elastic members function to rotate the rocker in different directions when the rocker is pivoted to different positions.