SI movie 1 from The dynamic role of the ilio-sacral joint in jumping frogs RichardsChristopher T. EberhardEnrico A. CollingsAmber J. 2018 Example simulation (sim 1) showing the steepest jump in three views. The red ball indicates the time-varying position of the centre of mass. The simulated ground reaction force vector (left leg only) is shown in black. The simulation is paused at the moment of takeoff.