A process for manufacturing a semiconductor device, particularly a thin film transistor, by using a crystalline silicon film having excellent characteristics. The position of a piston in a cylinder of the engine is determined and fuel is injected into a combustion chamber of that cylinder whose piston is disposed in a work phase. The first set of header information includes a first sequence number and a second sequence number, in which the first set of header information includes a first sequence number incremented to indicate a change from the second sequence number. Further, the training device is particularly advantageous for use in a home gym and may be stored under a bed or within the overhead compartment of an airplane.