Join a gym, if you don't belong already, and go EVERY day that you possibly can. I was a member but didn't go regularly and ended up with sciatica. Quilting is fun but the repetitive motions involved can be really hard on your back and hips. After about six months of severe pain, I finally went to the doctor, got a good dose of steroids, some physical therapy and relief. While I was feeling good, I went back to the gym, signed up with a personal trainer, and got active and serious about exercise and diet. It's been a year. . . I look and feel so much better and can enjoy my sewing much more than before.
It doesn't have to be a gym, but some physical activity every day is very helpful.
Enjoy your retirement. I retired a couple of years ago from the Corporate rat race and I've never looked back!