Class Cards (Practice & Play "Open Gym" cards are also available) are a flexible enrollment option to fit your busy and ever-changing schedule. When you purchase a class card, you may use the credits to schedule a class for any age-appropriate child in your family. Note: Access to classes using a class card is not always guaranteed, since some classes may be full; however, enrolled families often will mark their children absent prior to the start of a class, so even in these circumstances class card users can frequently book a spot by rechecking availability within an hour or two of the class's start time.