I have done it all - high school, University, profession football, all-star. I enjoyed my time on the pro football team, but I prefer competing, and still do. I know lots of competitive AS cheerleaders who do switch over as they're slowing down from competition. It's a time to keep doing the sport in a low-key fun way with way less pressure. However, it is very different. I have known some very talented athletes not make the pro football team because they don't have the right look (and also many who made the team with limited skill because they looked good out on the field). Stunts are simple. The average fan doesn't know the difference between anyway, and just thinks - cool! Someone got thrown in the air. The skills needed for professional cheer are different. You need to be young, but old and mature enough to not look 12. Outgoing and able to small talk with everyone. You have to have the right look, the right body type and look good on the field and scoreboard. Yes, you need the skills too, but being the top tumbler/stunter/dancer doesn't mean you will actually make the team (and yes, there are some very talented athletes on these teams, but skill isn't the be all end all in the same way it is on Worlds teams)