Climbing stairs on a machine sounds exhausting but it doesn’t have to be. “I like StepMill better than the Stairmaster because it involves more body awareness,” Szekretar says. “It’s a very functional exercise for everybody.” Studies show that 1 mph on a StepMill 5 provides the same calorie burn as running on a flat treadmill at 7mph (the average person walks/runs much, much slower than that on a treadmill), according to experts at NYSC. 1 mph is level 10 on a StepMill3 or StairMaster. 1 mph on a StepMill burns approximately 820 calories/hour for a 170-pound person and burns approximately 675 calories/hour for a 140-pound person.