I've been doing taichi for about 5 years. In addition to changing how I bend (for the better), about a year in I was in the process of renovating my gait a second time. As a person who always gets asked to 'slow down' it was a weird experience to have to ask others to do the same. Unfortunately for them now I walk faster than ever.
I came to this from a world of leg and back pain. It hasn't fixed everything but I can do almost 5 times as much without tipping over into chronic joint pain.
The quickest things I can relate to people that I learned from this time: 1) Never lock your joints. 2) "Lift with your knees not your back" is the wrong advice. Lifting "with your knees" is loading your quads. That and joint locking put all of the stress on the parts of your knee (cartilage especially) that are already overworked in the western posture.
The correct advice is "Lift with your legs", which takes longer to explain but the Cliff's Notes version is that your legs are 3 joints and lifting with your knees is only using one set of muscles and essentially locking the rest. The right way to lift is to engage your calves, your ass, and your hams.
There's a great saying I heard somewhere about the Problem with Western Posture being that we try to use our hips as a hinge joint and our knees as a ball joint. There are a lot of tight muscles in the hips and upper thighs that have to unclench to get there, and you literally feel like you're falling over while you try to sort that out. But man if you do, I've avoided half a dozen spills that should have put me in the doctor's office and one that would have sent me to rehab for torn ankle ligaments for sure.
The downside of this experience has been that I have to fight an urge to analyze everyone else's posture. I end up staring at people if I'm not paying attention. I probably look like a creep. And some people make me feel sympathetic joint pain. The number of people with fallen arches is crazy.