Gift certificate for tuition for the Fall semester at Smart Workout (Lexington and 40th, near Grand Central).  For busy New Yorkers trying to balance work demands and family life while trying to find activities for their kids and also time for themselves to work out, Kidz Fit at Smart Workout provides a practical solution.  While the kids are enjoying their fitness classes, their parents get separate classes of their own.  Smart Workout offers a variety of classes for kids ages 6-10 so that their parents can choose classes that work well for them, as well.