A Complete Body Fitness Machine that provides for a muscle building workout as well as a cardiovascular workout for the total body consists generally of an adjustable seat and two arms on either side, which are adjustable in height and have an infinitely and independently variable resistance possible in either clockwise or counterclockwise rotation. The processing circuitry extracts a core line of a tubular structure from three dimensional medical image data. The force with which the heating rollers engage the fusing roller is controlled within desired operating limits.