Step Machines where originally designed to punish prisoners; Stair-stepping electric generators were powered in the mid to late 1800 with "prisoner power." Inmates were used to Generate Electricity by spending their days on Stair Steppers. Now Punish Glutes with a Step Machine! Steppers are great for Aerobic Workouts training while Toning Legs and getting a Better Butt. Stepper Exercising: Strengthens Pelvic Muscles, Develops Lower Body Strength, Increases Endurance. Burns Fat and Improves Aerobic Conditioning.