98 and thereby cause or affect rotary motion of a spool 100 a first an end 101 of the cable 98 is anchored onto the spool 100 and a second end 102 of the cable 98 is anchored onto pulling bar 96 alternatively the spool 100 could be driven by foot pedals 30 amp 32 or hand pedals not shown the spool 100 is rotatably mounted on the third frame 94 the third frame 94 additionally supports a speed increaser timing belt drive 104 hereafter u201c belt drive u201d 104 the belt drive 104 includes a bull gear 106 a bull gear shaft 107 a pinion gear 108 and a drive belt 110 the bull gear shaft 107 mechanically couples the bull gear 106 and the spool 100 the variable pitch pulley 52 is located at an end of a drive shaft 112 a v belt 114 connects the variable pitch pulley 52 with a housing pulley 116 mounted on the brake housing 4 the shaft 12 of the inner impeller 8 drives a disc 118 the disc 118 acts as an inertial load and in normal use may rotate in either direction the user controls the resistance of the third version 92 by operating a hand wheel adjustment arm 119 which positions a control bar 120 the movement of the control bar 120 as driven by the hand wheel adjustment arm 119 varies the center distance between the variable pitch pulley 52.