Start with 2 elevators facing one another. Now place another elevator in the middle of them, but slightly in front.  Have that elevator face them with their back towards the crowd.

Have the top flier bend over and hook her arms with the front arms of the base fliers.  On count the top elevator flier's bases will dip, throw and guide her feet up to an inverted position.  The top flier will tuck her chin, ride her hips/buttocks up, squeeze her abs, and direct her toes to the ceiling.  The base flier will have their back hand on the flier back and guide her up with resistance.  The top flier can split for the finish OR keep her legs together.