解释为：有组织的运动在美国是一种非常普遍的体验.
结构：主语playing organized sports；谓语is ；宾语such a common experience in the US
另外,such a common experience in the US是一种常见的表达方式,表示非常.比如,such a beautiful girl. such a fine day!
希望对你有用.