It is a great idea to start fitness at the age of 30, because 30-year-old men are busy recording their work every day in order to start a business, and because 30-year-old men are young and don't care much about their health. Some people say: before the age of 40, use your body to fight for money, and after 40, use money to fight for health. Therefore, it is good to have a health concept at the age of 30. You should take good care of your heart/liver/spleen/stomach/kidney and have a normal daily routine. Don't stay up late, because staying up late is very harmful to your health and don't drink too much.