Posture is bullshit. People have back pain because they are weak in their back who have no muscle. Just get stronger with real physical exercises (done safely) and you'll be fine.
People have poor muscular tone because of poor postre and bad habits in the first place. There are people who never work out and are just fine, have no back pain but do have good posture and proper gait.
And there are people who work out with incorrect posture. They have more problems than all, so posture and good habits are very important.
Posture is bullshit. People have back pain because they are weak in their back who have no muscle. Just get stronger with real physical exercises (done safely) and you'll be fine.