Hi Rod:
One thing to consider - and it may not be your "cup of tea" - is water aerobics. I had surgery on both knees years ago and must be careful. I did some research and learned about water aerobics which provides a thorough workout with less stress on the joints. I have been taking classes via the "Silver Sneakers" program. My medicare senior advantage program provides me free gym membership which includes entry into the Silver Sneakers program. I attend the regular aerobics and my gym offers water aerobics classes. An added benefit is the social aspect. I've met a number of pretty nice older folks who attend regularly. The classes are uplifting and fun! Here is a link to get information: https://www.silversneakers.com/blog/swimming-exercise/ I hope this info is helpful. Keep on truckin'!