Yes, it is best to practice bouncing at the age of 6-23. You are only twenty-two years old now. Just practice every day. Some people say that squatting can improve the bounce, which is true, but when doing squatting, the knee will have the sound of bone rubbing, which means that the knee is injured. If you do too much, you will be disabled. I suggest: lift dumbbells (not more than 30 kilograms) and jump hard, twelve in each group, twelve groups a day. Remember, try your best to jump every time.