This treadmill actually enables you to interact with a virtual personal trainer! You just plug in the iFit workout card, press go, and you're off. The card controls your speed and incline while offering you audio coaching,by a Certified Personal Trainer. The trainer offers eight weeks of various kinds of workouts. You can also fire your trainer and just enjoy the iPod-compatible music port! The Intermix Acoustics 2.0 sound system is built in and sounds great anytime!. The 680 LT has a self-cooling 2.75 hp motor. Your joints are cushioned by TreadSoft Max cushioning. You can control every aspect of your workout intensity through the Quick Incline and QuickSpeed control, This treadmilll has 16 built in iFit workouts, a 300 lb weight capacity, and a 25 year warranty on the motor.