Aerobic training can be done slowly, that is, jogging, walking and a little exercise. The intensity of exercise increases slowly from small to large, and you must not suddenly exercise violently. I suggest that no matter what illness you get, you should keep exercising, even walking, and keep a good attitude. Personally, I think gym exercise is not suitable for your situation. The people there are too noisy, and most of the sports in the gym are explosive, which is not suitable for patients who have recovered from a serious illness. You can try yoga, because yoga is a heart-nourishing exercise, the intensity changes from small to large, and the physical and mental bones are slowly exercised and stretched. May you be healthy forever! Happy! It will get better and better!