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If you don't want to go the chiropractor route or yoga or back exercises that you'll forget to do after a week, try out the Better Back. It was a Kickstarter project that you can now find on Amazon: BetterBack - Correct Back Posture While Sitting, Featured on Shark Tank, Doctor Recommended (Back Support Belt) [link]
I keep it in my work chair and put it on almost daily. It forces me to sit up straight but not in an uncomfortable way at all. Now I find myself actually sitting straight up when I'm not using it.
Better Back. This simple device has done wonders for my desk posture.
Get a better back. I find that it really helps my posture.
Try this out, it works great