I say it’s a string because it looks like her foot pivots around a point. Instead of her motion translating, following her center of gravity, her right foot stays in the air momentarily. Notice how her right foot also bounces a bit as if the tension on a string supports her foot
If you’ve ever seen someone do the robot where they keep their head in one spot and their body moves around it, it’s the same concept but more dynamic. She’s probably just an amazing cheerleader with really good coordination
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