I’m most interested in cardiac exercises. Getting my heart rate and breathing up for about a hour a day, 6 days a week really help with my vital signs. Don’t need near as much meds. And after 2 bypass surgeries, and having my left carotid artery cleaned out because it caused a stroke I take the exercise serious.
Like you Dee I have old injuries as well. My right shoulder is about gone and the left is not far behind. The arteries in both legs have some blockage but not bad enough for surgery. And my lower back is a mess too for all the heavy lifting in my first carear. But sitting down just makes it all worse so better to keep moving as much as you can.