Abstract: An apparatus which provides both amusement and exercise takes the form of a simulated animal or other body with pedals attached. A rider sitting on the body drives the pedals. As the pedals are driven, gearing within the body imparts a reciprocating upward and forward movement of the body, as if the body, particularly when that of an animal, were running or walking. The gearing arrangement also reduces the amount of effort a rider must expend to move the simulated animal body weight to overcome the effect of the rider's own weight. With the gearing within the body, little chance of injury to others exists. The gearing also imparts a more realistic simulation of running movement of an animal.