Requires a minimum celing height of 10 feet. For 25 years, the StairMaster SM5 StepMill with 2 Window LCD Console has been called the toughest workout in the gym. Now you can bring that same toughness to your home with the totally redesigned SM5. The StepMill is easy to recognize - it"s the piece of cardio equipment that looks brutal compared to all the others, with a revolving set of eight-inch stairs that closely duplicates the workout of actual stair climbing. Each time you mount the StepMill, the unit"s electronically controlled, chain-driven alternator precisely controls the pedal descent, allowing a wide range of users to exercise smoothly within their comfort zones. The resulting step range of 26 to 162 steps per minute will strengthen your legs, boost your cardio, and challenge even the fittest of users. The new StepMill 5 offers the core mechanics of our previous models wrapped in a stylish look and enhanced functionality to create a next-generation experience. The SM5 offers plenty of workout options, with such programs as quick start, manual, fat burner, calorie burner, intervals, bell-shaped, build, mystery challenge, steady, and heart rate zone trainer. The console also offers a nationally recognized multi-stage fitness test that gauges your individual progress, along with a custom firefighter test that measures your cardiopulmonary endurance and muscular strength. (Firefighting is considered one of the most physically demanding jobs in North America, which is why the test is such a natural fit with the StepMill.) Finally, with the new D-1 console it"s easy to track your progress thanks to the easy-to-read backlit 2 window LCD display, which tracks your speed, distance, floors climbed, calories burned, and much more.