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Re:Tell HN: Putting mirrors around my desk improved my posture by thenerdhead on Sunday May 14, 2023 @03:44PM (#35940786)
You can have a strong core and still have bad posture.

Being more aware helps you correct it. Mirrors are a great way to do that. Not honestly sure how your bicep comparison is relevant, but people look in front of mirrors to correct form for their bicep curls too.

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