A human-powered vehicle related to bicycles and rowing machines consisting of three or more wheels attached to a horizontal frame. For the purpose of a better understanding we will use a three-wheeled vehicle. There is no substantial difference between the front part of this invention and the front part of a regular bicycle. The rear wheels are attached to the frame and are driven by chains attached to their one-way sprocket freewheels. The chains are directly attached to a bar on which the pedals are mounted. There is a sliding board located on the front part of the framework which moves freely forwards and backwards on the frame. The board is covered with a soft foam-type material. The operator of this vehicle lies horizontally on the vehicle facing the ground and places the sliding board under his stomach while holding the handlebars and inserting his feet into the pedals. When the operator pushes on the handlebars his body slides backwards with the sliding board. At the same time, he pushes on the pedals with his feet. Notice that the operator does not turn the pedals. Both pedals move simultaneously backwards while pulling the chains with them, thus turning the rear wheels in the direction that moves the vehicle forward. Then, the operator pulls back with his arms and legs and returns to the starting position. When the operator pulls back, the pedals either move the chains freely in the other direction, due to one-way sprocket freewheels to which the chains are attached, or they continue moving the chains in the same direction as the wheels, due to a mechanism which locks the pedals bar to the upper part of the chains instead of the lower part as before, and thus turning them in the same direction. With few or no changes, this invention is convertible into a rowing machine. By sitting upright on the sliding board and by inserting his feet into front pedals the operator can steer the vehicle. By pushing and pulling on the front pedals and the rear handlebars with his hands and feet, he can create a forward motion of the vehicle. A second operator can be seated on an additional sliding board located at the rear of the framework. By pushing on the rear handlebars he can aid the first operator, who would be positioned horizontally, in the propulsion of the vehicle.