Dead hangs. Work up to 5 minutes a day. They fix so much

Walk an hour every day

>>77308372
A lot if it is just lack of mobility and tight fascia that basically keeps you in poor posture. The specific muscles you can supposedly train to improve it can't really overcome that resistance if the mobility isn't there. A basic mobility / stretching routine that focuses a bit more on thoracic mobility will suffice but you'll have to do it every day. I do mine every morning and it takes 15 minutes. I'd say it took like 1 month for the first notable improvements and now my posture is great without having to make a conscious effort.

>>77308372
I've been working on this for years mate. You're right in that most of the advice is for old people and is all "stretch this, stretch that" because people want to make money on youtube.

It depends on where you're at. If you're absolutely golem tier you can benefit from stretching your chest and lats, doing shoulder dislocates, chin tucks, and most importantly thoracic mobilisation exercises (look up Zenith rotations).

But it will only get your so far. Really the only way to get lasting change is the get stronger in the positions you're weak in. Can't lift your arms straight overhead? - Get stronger overhead. Work towards being able to do an overhead squat, which is not easy, but that's the point. It's not easy because you're weak in that position. Start with behind-the-neck-press with the empty bar (if you can) and build it up.

>>77308431
What’s ur routine?

Regular exercise and sports fix it

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Archlifter. If you don't want to spend money on this goofy thing, you can also lay belly up on a bed from time to time and have your shoulders on its edge, in a way that your head is outside of it without support so it can drop backwards with gravity and push your neck and upper back bones.