Something called "The Koala Challenge" is trending online, and it requires two people. But both of you need to be in pretty good shape to pull it off. Otherwise, you'll just ruin your back, break your neck, or both.

Basically, one person just stands there while the other one climbs all over them, like a koala climbing around a tree.

My whole body hurts just watching these videos!

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#koalachallenge @erikalisthenics

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