XISER PORTABLE STAIR STEPPERS ARE DESIGNED AND BUILT IN THE U.S.A. Dependable Durability Follow Dr. Mark Smith in Demonstrating the differences between a Cheap Mini Stepper Stair Climber and the Xiser Anaerobic High Intensity Trainer™ https://www.youtube.com/watch?v=MYCEA3T_xaM https://www.youtube.com/watch?v=m_IU96RP6r8 https://www.youtube.com/watch?v=EvxCJZi-Z_4 https://www.youtube.com/watch?v=k9dqUsGKEmE