Physically, we can choose to walk around the park in the morning. This will give your muscles enough exercise. Or buy a treadmill for your own use and adjust it to a slower pace. This can also realize the idea of exercising at home. What is more important than the body is psychology.
Because only mental health, the body will follow health. So retire at home and try to learn something. I like playing chess. I can spend a few games in the park when I have nothing to do. Can fully relax the body and mind. What the elderly need most is companionship. If their children are often away from home, consider getting a dog or a cat. So as to get a kind of spiritual care.
In addition, we often say that it is never too old to learn. You can read history books or learn calligraphy at home. So as to cultivate one's own sentiment. Because there is nothing to do after retirement, you can devote yourself wholeheartedly to these aspects. Over time, your physical and mental health will be greatly improved.