A lower body exerciser mainly comprises: a central base; two support brackets located at each side of the central base respectively; two slide tracks connecting the central base with each of the two support brackets respectively; two foot pedals mounted on each of the two slide tracks respectively; a connecting base being fixed under each foot pedal, matched with the slide track, and used for rotating around and sliding along the longitudinal direction of the arc-shaped slide track. A plurality of O-Ring elastic bands are mounted around the pulley sets to generate tension for exercise. The two slide tracks are hinged at each side of the central base respectively, so the exerciser is foldable for convenient carry and storage. This lower body exerciser could help to strengthen and define thighs, legs, buns and hips muscles with minimizing time and maximizing positive results.