@ray666
I watched a YouTube video, of which there are several sessions that appear on Facebook reels, and the leader of the "knee arthritis" exercises focuses, among many things, a lot on strengthening the glute (butt) muscles), These, when stronger, will take some of the weight off your knee joints. And you can get the glutes stronger by sitting in a chair or on the couch and tightening (i.e. isometric) your butt muscles for as long as you can hold the squeeze. Or stand up against the wall and do so, or while you are in the shower hold the muscles tight as long as you can. I'd still like you to simply identify the exercises your PT person has you do.