A single prolate spheroidal element is defined to be incompressible and isotropic (Mooney-Rivlin material law). Geometry is interpolated isochorically (Focus^3.Cosh[lambda].Sinh^2[lambda]).Hydrostatic pressure is interpolated quadratically in Xi3 (element based). The prolate is inflated with a pressure of 2kPa on the inside face while the the pressure is held at zero on the outside face.