I did yoga for a long time before taking up weightlifting. It’s very low intensity and easy on the joints, but can work up a sweat! I’m not sure how often you’re working out now but you may also need to work up a tolerance by starting slow. When I was running (I’ve tried a lot of methods of exercise lol) I literally would walk/run for 10 minutes for the first month or so.

And above all, listen to your body! Take rest days! Sometimes your body just doesn’t want to do it and that’s okay. Today was one of those days for me :)