Torso Track Easy to use - just stretch out slowly and come back for full range of abdominal motion, with a padded knee area for a comfortable workout. Lightweight and portable - stores easily! Firm and tone your upper, middle and lower abs as well as your obliques, arms, shoulders, chest and back. Torso Track's assisted movement guarantees you have perfect form every time and it works your muscles in both directions for a continuous workout. Adjusts to four levels of intensity.