As an example, if you or someone else randomly moves your arms you know exactly where they are relative to other parts of your body, how does the brain know this?
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Practice.
This is why babies are so incredibly awkward: They DONT know where they are and they are having to learn to both move them as well as know where they are when moving them.
Further, this is why teenage boys go through a phase of clumsiness when they hit puberty: They often have growth spurts that are fast enough that the sense of awareness of their body parts they have built up over time is thrown out of whack and knees and elbows start hitting door frames and tables and they trip over everything because they’re not moving their feet at the speeds and heights they think they are.
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