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Find a good class or team. Be on time. Work hard. Ask your coach or instructor for tips.

Article:
If you are in high school, sign up for your school's gymnastics team. If you are younger you would have to join classes. If you are more advanced, you may be able to join a competitive gymnastics team. Arrange a good schedule, and make sure you leave a good amount of time to get to your class. Not just vault, floor, beam, bars. Also, work hard in the conditioning and stretching. But don't go too far, especially with the stretching. If you are in a group like most gymnasts, asks for tips that are most important to you. But if you have a private instructor/coach, ask them help for all skills, learn to deal with criticism, because most coaches don't mean to insult you. Use the tips. Unless your coach is just a friend's parent, or a P.E. teacher, you should trust their tips. Coaches at gymnastics gyms, are qualified, and most competitive ones, have been through the 10 levels of gymnastics some are even elite gymnasts.