Well, I think it is mainly considered from two aspects: first, you are in good health, and the internal fire is very prosperous. The nosebleeds caused by internal fire are mainly. Second, you are not nervous. You may have high blood pressure. Blood pressure will rise during exercise, and there is a small artery (or vein) inside the nasal cavity that is easy to rupture, so there is a nosebleed. I suggest you go to the hospital for a check-up at your convenience. Wish you good health.