The ProForm 580 LT features the custom Weight Loss Center, which uses your weight, workout time, and calorie goal to customize a workout. All that in addition to 8 built in iFit workouts. The 580 LT also comes with a built-in universal iPode dock that allows you to recharge you iPod and hear your favorite tunes while you work out. This treadmill also provides as much as a 15% reduction in joint impact through its SoftFlex Cushioning. Further advantages are a 15 year warranty on the powerful 2.8 hp drive motor, precision QuickSpeed control, and a 300 pound weight capacity. Meet your fitness goals with this quality treadmill.