The Precor AMT was introduced in 2007. It was the first machine ever with adaptive motion, meaning it is a user defined motion, as opposed to a machine define motion. This means if the user has short strides or long strides, or wants to use it more like a stepper, elliptical, treadmill, or any in between, it will allow for this. Precor AMTs remain the industry leader in adaptive motion technology. Fitness Superstore carries a wide selection of Precor AMTs. Options include the more original AMT 100i, the non open strides, and the newer open stride AMT's