It would seem that our bodies are built with moving parts for a reason. We need to move. Exercise is becoming more and more important because technology is lessening the need to move. Your body will forget what it doesn’t have to do. So you have to make it move every day, train it to stay capable of meeting your needs.
It doesn’t have to be some intense, bodybuilding workout. It could just be a walk, or push-ups against a door in your house, or squats, or marching in place. Getting involved in social recreation such as pickleball, tennis and golf is a great idea. Try gardening, trim the hedges, mow the lawn. Just something. As we get older, being sedentary gets more and more dangerous.
Turn off the TV, put down the book, stand-up and move. Remind all of your moving parts that they still have an important job to do.