Good posture helps all my organs work without struggling, and makes moving both easier and more graceful. It usually takes a bit of pain to remind me to get better than mediocre, though. Or, the sight of some other whitehead with their head slung forward like a buzzard's, struggling to walk.
In '00, I had my arm in a sling, and very nearly got a frozen shoulder before some medico told me to move it. I had to go for over a dozen physiotherapy sessions. (Interestingly, the therapist used to tell me about her business plans, etc, which she never did with others.) In '07, I did a bit of carrying one day, and woke up the next with the other shoulder unable to raise my arm above level. After 6 months of doctor visits, I got my DX - there was something wrong with my shoulder. They didn't even bother translating it into Latin. Then, one visit to a "natural talent" massage therapist fixed it, again over the next night. I've had similar cures before, and heard of others first-hand.
I have heard many cautions about chiropractors, and am sure that many of them only do enough to encourage repeat visits, but there is at least one who only sees most patients once, because they stay fixed. Other natural healers may work as massage therapists or other specialties. I have extensive experience in massage, and the treatment that fixed my shoulder was one of the light touch variety, doing very subtle work.
In '17, I had a simple fracture of the thumb, and I would have been far better off just taking care of it myself. The bureaucrat-ridden medical system in rural Canada is a tragicomedy of bunglers. They never did set it, and ruined my general health by making me dash off to distant appointments. At the same time, a stubbed big toe led to the nail not growing. The official diagnosis was fungus, and the cure was an oral fungicide, with monthly blood tests to see if my liver was going to survive the treatment. Instead, I did a search, and tried Tea Tree oil. The nail is now healthy, and almost grown out, for one drop per after-bath.