How is it that you feel flustered and want to throw up the first time you go to the gym to do an entry-level job?
What did you do? It may irritate the stomach, so it's disgusting. Then maybe the heart is too weak to raise blood pressure, so I am flustered. You ... walk more! Run 800 meters first, or start from 400 meters if you can't! When can you run 5 kilometers, then consider growing muscles! You can imagine how weak you are now!