Abstract: A torso trainer has a user platform mounted on a pivoting, rotating shaft. The lower torso of the user is strapped to the platform with the upper torso supported by the user who employs the waistline muscles. As the platform rotates, different muscle groups are worked so that during the course of a complete 360.degree. revolution all the waistline muscles are exercised. The user effort required varies with the degree of tilting of the shaft and platform. At a nearly vertical tilting position user effort is minimal, while, at a horizontal tilting position, user effort is maximum. A user hand control starts platform rotation and overrides the stopping of platform rotation so that there can be multiple rotations.