Nothing, but pay attention to the rhythm and progress. Don't be too difficult at first. This body may not be able to bear it. Like you just started, practice some simple exercises first, and you'd better do warm-up exercises before practice. Everyone's body needs an adaptation process. It's normal that you will feel uncomfortable at first. After you practice for a month or two, you won't have any adverse reactions. Take your time, don't rush for success, it's not good to get hurt.