If you’ve trained with me, you’ll know how often I emphasize good posture when lifting, and even when we are going about our daily life. As a corrective exercise and rehabilitation specialist, I always believe in straightening the body first, before strengthening it.
I’ve also wrote something on how to correct your posture here http://www.kewynnpt.com/the-modern-posture/
If you need expert help, you can always contact me for an assessment and consultation.
Check out this video on the benefits of good posture. Enjoy.