DS1 has just turned four and I'm noticing that some of my mummy acquaintences are getting thier DC's to do 'stuff' at the weekend, like rugbytots, yogabugs etc. I always thought weekends were for us to spend together as a family with DH and 2yr old DS2 but maybe I am depriving him of classes that will benefit him when he's older. What do your 4 year old DC's do and is it worth the money / effort etc?