Abstract: The Abdomicycle is a three or four-wheeled vehicle, (depending upon vehicle model) on which a rider sits upon a seat, leans back against a backrest which is provided for comfort and safety purposes and propels the vehicle either forward or reverse by a reciprocating motion on a bar that encloses them as they sit on the Abdomicycle. The bar is connected to either the single or dual rear wheels via a crank type mechanism that allows the linear pushing/pulling of the bar from front to back to be converted into a circular motion for the purpose of driving the rear wheel or wheels. The occupant's feet rest upon a forward steering linkage system that allows either foot pressure, or the leaning position of the occupant's body to turn the vehicle to the right or left. The vehicle includes a braking system connected by cable to the wheel(s) for the purpose of stopping the vehicle. The Abdomicycle is designed as a manually powered vehicle for exercises.