The brand new stair master hiitmill x comes from the makers of one of the toughest workouts in the gyms to date this cardio machine have been designed to be a self powered speed and strength training tools to help users build on their explosive power when they use the machine in a highly intense interval training program users can push drive and sprint with the resistance of a sled in a safe manner and smaller footprint and with this machine users will be provided with an effective resistance