We’re… Floppy. We can only sit or stand upright because of our muscles tensing. Muscles tense when ordered to, they can’t freeze in place, our joints can’t just lock. This means we cannot just be passively rigid, like a block of stone or rubber or something, we have to actively keep upright. While this means that we can actively, purposely resist being knocked over, this lack of inherent rigidity also means that any slight relaxation or twitches of our own muscles also have to be corrected for.
Consider just the ankles. Because they’re not inherently rigid, any imbalance in how the muscles tense results in you tilting at your very base and needs to be corrected for. This means continuous small movements. The only way this could be eliminated is if our muscles could literally freeze solid and remain that way, but they cannot.
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