Active moms / active kids

Another interesting study announced on TV earlier this week.  It seems that moms who are active tend to have kids who are active.  Why is this a surprise?  Everyone knows the saying "Don't do as I do, do as I say."  But any parent also knows that kids will do as you do much more often than they will do as you say.  It seems to me these people doing studies could probably save a ton of money if they just asked parents a few questions.  Oh wait, that's probably what they did.  Good thing this doesn't apply to grandmas.  Everyone knows that kids always do what their grandmas tell them.