If you're following my plan from Sunday, today we'll be walking for 20 minutes.
Now I'm not talking a leisurely walk here, I'm talking brisk ~ about 120 steps per minute. (I talk more about walking here.) Your kids will certainly have no problem keeping this pace with you and if they're in a stroller or a wagon, well, the extra weight is a bonus!
Bad weather? Walk around inside! No excuses...