Totally agree with last sentence Greatnan. I have arthritis in my right knee and right hand - sequels of a terrible car crash when I was young. It can be quite painful, but the very last thing that helps is rest.
No time to do all the walking, as I have chosen NOT to downsize, lol, and I have a big garden to care for. My green gym. Out in a mo to go poo picking- well horse manure. We have 2 fields, 1 at back and 1 on East side, that a farming neighbour uses on and off for her horses. Back breaking work - but very satisfying as I can put a big layer in each of my 8 compost bins. Great accelerator and makes fab compost (mixed with grass, garden waste and regular layers of corrugated cardboard).
Will go and try the nearest pool on French side, by Lac St Point soon - as I'd really like to swim regularly, but outdoors. I use short 'physiotherapy' flippers, and a combination of breast stroke arms and crawl legs (can't do froggy legs due to knee). That really strengthen's the muscles around the knees, the back and stomach, without any strain. Must wear goggles to keep head low though, to stop getting neck ache.