The Spirit Fitness CSC900 StairClimber is a great way to get a challenging yet rewarding workout. A sturdy industrial drive system ensures years of reliable, trouble-free service. The transmission, from steps to brake, is a chain connected to steps driving a 20:1 gearbox connected to an automobile Prestolite alternator. The 21.5″ step width and 11″ step depth provide one of the largest step surface areas of any commercial stair-stepping machine, which increases safety while also easily accommodating training positions such as side crossover steps. The CSC900 has 10 pre-programmed workouts, 20 levels of resistance, and can reach up to 168 steps per minute to help you keep your fitness routines challenging. The multi-position handlebars include built-in heart rate sensors and resistance controls to help you stay in the zone.