is supported by a seat and backrest and linkages are provided to adjust the seat vertically and the backrest horizontally relative to the movement arms application_number US 2080793 A description referring now to the drawings in detail there is shown for illustrative purposes only a machine embodying the present invention particularly suited for exercising muscles of the upper body especially the pectoral muscles in the preferred embodiment shown the machine includes a front frame generally designated 10 and a rear frame generally designated 31 extending at right angles to front frame 10 and including at one end an upstanding vertical weight stack frame 52 as shown in fig1 and 5 front frame 10 includes a vertical upstanding frame 63 and 65 for mounting a movement arm 27 as will be described below the frames are made from elongated rails or tubular stock of high strength metallic material however any other suitable material may be utilized as long as it provides the necessary strength and weight front frame 10 includes a seat generally designated 43 mounted to the frame by means of a parallelogram linkage generally designated 55 linkage 55 is adjustable vertically to change the elevation of the seat 43 to suit the user and once adjusted it is held in place by a latch plate 4a which receives a latch pin 2 on a latch arm 3 which is actuated by means of a handle 54 shown in fig2 seat 43 is connected to the linkage by link 55a and a link 57 link 55a as well as opposite parallel links 55b are moveable relative to a stationary link formed by a stationary frame element.