Put kids in partners and have them face one another, width-wise, from across the gym.
When you yell “Prince,” they have to run and meet in the middle, one of them has to take a knee and have their partner sit on their other knee and point up to the sky and freeze.
If you yell “Princess,” then they meet in the middle, and one partner jumps into the arms of the other partner, points up to the sky, and freezes.
If you yell “Chevalier,” the partners meet in the middle, and one partner jumps on the back of the other partner and points up to the sky and freezes.
The last group to complete the task each round is eliminated. I usually do a whole whack of practice rounds before playing 2-3 elimination rounds.