Definition:

The prep grip is the grip used in most two-legged stunts once the stunt has hit. In the prep grip, the base turns her hands away from each other so that one hand cradles the front portion of the foot (the ball of the foot and toes) and the other hand cradles the back portion of the foot (under and at the back of the heel). The inside of the base’s wrists will be facing each other under the foot.

In this grip, aim to cover as much of the bottom of the foot as possible with your hands, while still being able to grip the toe and heel.