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How to have proper posture (girls )
The first thing you should do is to try to identify any issues with your current posture.
Many postural issues happen due to the muscles used to hold a joint in place are out of balance. Improving your posture does not require much, but for this step you will need a mirror.
Begin by doing a standing assessment of your posture by standing in front of a mirror with form fitting clothing. Do this assessment barefooted relax your body and try not to force yourself to stand in a manner that you would not normally stand.