Growing up I always remember my dad reminding me, "Stand up straight!" Good posture is good to learn at an early age, both for long term health and athletic performance. Sometimes grown up words don't make much sense in the world of a little one, though, so we use metaphors that excite them. To keep their backs up tall in a squat, they make butterflies with their hands and then fly their butterflies as high as they can, while they squat down.
Kayla makes her butterflies, before she squats.
As many rounds as possible:
10 Front Squats
10 Push Ups
Duck Walk & Run Relay Races