The brand new stair master hiitmill 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 tool to help users build on their explosive power when they use the machine in a high intensity interval training program users can push drive and sprint with the resistance of a sled in a safe manner and smaller footprint and with the high intensity machine users will be provided with an effective