The present invention is an apparatus for training a quarterback in skills necessary for the game of American football. The implement also includes ground engaging wheels attached to the transaxle axles, a handle allowing control of the implement, and one of a plurality of interchangeable working devices attached to the engine and transaxle module. The developer is supplied to the supply target around an upper end portion of the vertical carrying substrate. Additional queries may be built that use previous queries as sources. The section of the first curved surface by the reference plane perpendicular to the side surface is a second curve. Accordingly, there can be provided a storage space beside the seat to allow an easy loading from the outside of the vehicle, thereby improving facilities of the vehicle.