The Tunturi 419i Climber uses independent, adjustable hydraulic shocks to provide an efficient cardio-vascular workout. Probably about 30 years old, it still works except for the workout tracking console. In about ten minutes you can be huffin and puffin, pouring out buckets of sweat and get your heart rate up as far as you want to go. Somewhat inglorious, but you can get a functional workout without leaving home and is alot better than nothing on a cold rainy day.