Original pre 1997 used Nordic Track pro model ski exercise machines reconditioned and restored to excellent condition . The Pro ski machine is the most popular ever manufactured by the original company with production exceeding millions of units over the years. It features adjustable incline with up and down sliding chrome legs that lock in place with pins . The resistance is based on the proven patented flywheel drag strap system which is quiet, smooth, and adjustable with a stainless steel clip that moves up and down on the upright. The arm reel resistance is also adjustable. Belly pad height is adjustable for custom fit to your height. The Pro, as with all the original Nordic Track ski machines , is a lifetime investment . Wear parts are replaceable on a long term basis. Easy maintenance insures long life. This is one of the greatest exercise machines ever invented and it's ongoing popularity among doctors, coaches, therapists, and exercise proffesionals confirms it as one of the best lightweight low profile aerobic exercise machines.