Well, this doesn't really apply to your DS, but there IS an obesity epidemic in this country. I must admit, if given a choice between sending my kids into the backyard for some exercise and sitting with a workbook, I'm pretty much always going to pick the yard!
Then again, it really doesn't have to take much time. Maybe think of brain-challenging games or conversations that take 5 minutes instead of giving him workbooks? That way it's family time (and fun) and not just MORE work.
Though maybe he already gets that with what he's doing now...
Hmmm...
