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Mountain Pose, the basis for all standing poses, is great for your posture.
As you become grounded and stand fully, you should notice that you become more aware of relaxing and straightening your shoulders.
I've found that doing Mountain Pose has made me more aware of how I stand in general. If I'm waiting in a line at the supermarket or bank, I'll often consciously straighten my back, relax and pull shoulders down and back. It feels great.