A lot of worthwhile texts, both fiction and nonfiction, make direct reference to particular sports or use sports analogies or metaphors. These are difficult to understand for readers who do not know the rudiments of these sports. But there is not enough education on these sports in school, except in the context of actual participation in them. But I suspect that only a minority of children in English-speaking countries participates in all of the culturally important sports that figure in English-language texts, sports such as American football, baseball, cricket, golf, hockey and soccer, understanding of which is needed for basic cultural literacy among readers of English (I have to confess to lacking that understanding in the case of most of these sports--my own school education was deficient in this respect). Thus, either there should either be broader participation--but that is unsafe in the case of American football and likely impractical in the case of golf--or there should be teaching about the rules of sports outside of contexts of participation, say in English or history class.
This post is inspired by my daughter's noting her difficulties in reading the cricket-related bits of a P. G. Wodehouse novel.