However, if you feel particularly unwell recently, don't do strenuous exercise yet. Excessive exercise can lead to low blood pressure, dizziness and even fainting, causing unnecessary harm.
You can wait until you are in good health for a while before you start exercising, no problem. As long as you have a good rest, it is no problem not to stay up late to exercise.
Of course, exercise should be moderate, and going to fitness should be carried out when physical conditions permit.
Extremely thin people can grow muscles when they go to the gym. It is best to go to a professional gym and find a fitness instructor for professional guidance. Correct exercise can also achieve the purpose of growing muscles.
Being thin may be a genetic factor or a physical problem. If the nutrition is balanced and the living habits are good, it is normal to be thin.