Double gold medallist has Rebecca Adlington opened the third UK School Games, a massive sports competition just for kids.
About 1,500 top school-aged athletes will compete in nine sports including athletics, table tennis, fencing, swimming and gymnastics.
It's the third year the three-day contest's taken place. This year's it's taking place in Bristol and Bath.
It's hoped the Games will encourage kids to aim for the 2012 Olympics.
Rebecca, who's the first British to win an Olympic swimming title since 1960, said: "I think the UK School Games is a fantastic event and having the ability to compete in a multi-sport competition will only help these young athletes for the future."