I have received an email from a member asking about 'walking practice' and saying that I am the only person on here who's ever mentioned it. Can't say I'd noticed, but anyway here's an update.
My OS pointed out that I was walking as if my feet were on two parallel lines ('traintracks'), which is unnatural and which I hadn't noticed. I was also shuffling and taking short steps, which I had noticed!
A natural walk is to swing each leading leg inwards, so that the path traced is much narrower. To exaggerate, imagine a catwalk model's step where each leading foot might even cross the natural line.
So my OS advised me to practice walking correctly (gentlemen, stop imagining now and keep up, that bit's finished). I found I had to think consciously about each step, taking it longer and deliberately putting the leading foot more on a centre line.
As soon as I did, though, I realised that what I'd been doing unconsciously before was wrong, I could feel it. And as long as I kept thinking, I could keep doing the correct stride. I used a stick at first, but to help a bit with balance, not to take weight if I could help it.
As I did longer strides, I found I'd get a 'pull' in my hamstrings and calves, a stretching effect. Good news.
Even now, weeks later, when I can walk well, if not fast, I keep on thinking about it -- and when tired will revert to that shuffle if not careful.