Abstract: A aquatic abdominal exerciser apparatus including an exerciser frame having a pair of side bars each having a central linear extent having a top end and a bottom end. Further provided is at least one arcuate extent integrally coupled to each central linear extent. The exerciser frame also has an adjustable crossbar coupled between the linear extents adjacent the bottom ends thereof. Lastly, a support frame is pivotally coupled to the exerciser frame thereby allowing the exerciser frame to pivot about an axis defined by the cross bar. The support frame is, in turn, fixedly coupled to a bath tub thus allowing use of the exerciser frame therein.