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I have poor posture and a straight neck, and when I walk and look in the mirror, my posture looks quite bad. The pain in my neck isn't severe, just a slight stiffness. I want to correct my posture, so I’ve been following neck exercises for straight necks from YouTube, but I’m not sure if they’re helping. For those with straight necks, could you please let me know if there are effective exercises I can do at home?