The Precor Experience™ treadmill delivers every modern, advanced feature of treadmill technology, and does so with solid, enduring style. Start off with the ride: your knees, back, and joints will be cushioned by the patented Ground Effects ® impact control system. This means significantly less pounding per mile. Furthermore, a 4.0 HP motor drives the proprietary Integrated Footplant Technology, which actually tapers belt speed to your exact movements, adding smoothness to your experience.