You'd better go out for a walk in the morning. It would be better if there was a park nearby. If not, walk on the road and breathe fresh air. If you feel strong, you can run, but don't be too tired. If you feel that your breathing is a little rough, you can buy a dumbbell around 10 kg at home, but you should stick to it. And if physical strength permits, it is best to do push-ups and sit-ups, not too much. I see quite a few retired people jogging when they have nothing to do and feel healthy. The most important thing for the elderly is waist exercise. Doing more squats can effectively prevent cardiovascular and cerebrovascular diseases, which is very good. thank you