To understand how mechanical forces drive symmetrization, we developed a mathematical model that describes the forces driv- ing propulsion, i.e., muscle contraction and elastic response from the jellyfish body. Simulation of the model shows that interac- tions between these local forces, within the ephyra geometry, can indeed lead to a recovery of global symmetry. Further, by making the ephyrae pulse faster or slower, we confirmed that the rate of muscle contraction dictates symmetrization speed.