receiving links 22 referring now to fig2 each crank assembly 24 mounted on each side of the apparatus 100 may generally include an outer crank 46 and an inner crank 48 rotatably mounted on a lower distal end of a respective rear rocker link 26 via a common shaft 50 each crank assembly 24 may further include a disk gear 52 disposed between the outer crank 46 and the inner crank 48 fixedly secured to the shaft 50 the outer crank 46 disk gear 52 and inner crank 48 are keyed to the shaft 50 to rotate together bearings may be disposed between the rear rocker links 26 and the shaft 50 to allow the crank assemblies 24 to freely rotate relative to the rear rocker links 26 referring again to fig1 a rear rocker link 26 is mounted on each side of the apparatus 100 the rocker links 26 are operatively connected to the rear stanchion 16 via a common shaft 42 rotatably secured to the rear stanchion 16 at bearing 44 bearings may be disposed between the rear rocker links 26 and the shaft 42 to allow the rocker links 26 to freely rotate relative to the shaft 42 bearings may also be disposed between the shaft 42 and the rear stanchion 16 to allow the shaft 42 to freely rotate relative to the rear stanchion 16 sprocket 60 may be keyed to the opposite ends of the shaft 42 the flywheel 18 may also be keyed to the shaft 42 to rotate together with the shaft 42 and sprockets 60 a conventional drag strap or other known resistance device may be connected to the flywheel 18.