Zeny Air Stair Stepper Cardiovascular Climber + Resistance Band + Calorie/time/distance Counter Using air resistance to cushion your every step, and much more superior than spring or piston types. The Air Stepper's advanced, air-powered design eliminates pounding and jarring impact on your body. Train shoulder, triceps, abs, oblique muscles, and muscles in your whole leg. Use your Air Stepper for a longer period without feeling pain because of the minimal impact on your body. Durable plastic and strong design for long lasting usage. 1 year parts and labor warranty.