Patent ID: 8727956

Claim:
A waist and hip developer, comprising: a track being smoothly arched and curving upwardly toward two distal ends thereof, said track comprising two stop members respectively located near the two distal ends thereof; a plurality of foot members affixed to a bottom side of said track and adapted for supporting said track on the floor steadily; a slide slidably coupled to said track with rollers thereof and movable back and forth along said track between said stop members, said slide comprising a lock screw; and a seat supported on said slide with a ball bearing and rotatable relative to said slide within a predetermined angle, said seat comprising: a ring with a plurality of protrusions disposed annularly around an outer edge of the ring; the protrusions are positioned to be alternatively stoppable against said lock screw to limit the angle of rotation of said seat relative to said slide; and a lock screw hole disconnectably fastenable to said lock screw to lock said seat to said slide.