You mean like, afterschooling with an actual curriculum?

I don't do that anymore. I did a little with my DD at her old school (where she was very underchallenged and also had almost no homework) and with my DS last year when he was dying of boredom at preschool. DD now has too much homework and too many other activities, and DS spends a lot of time on chess and other games. I should probably do math with him, but enh.

They read a lot and we do non-book-and-paper based enrichment activities.