The system will first use your classes in your monthly plan. If you want to come to an extra class, let’s say to your 5th class in the month and you are on the BusyMum plan (of 1 class per week), you will be out of classes. When trying to book the 5th class, the system will offer you the top up class in order to be able to finalize the booking. Please select “1 extra class” option.