With a SwimGym monthly/year membership you can train twice a week. Weekly you receive two credits which will be added to your account on a specific weekday and have a validity of two weeks. The credits are tagged with the issue date. Credits issued in week-1 will therefore expire earlier than the credits issued in week-2.
The SwimGym booking platform utilises automatically the oldest outstanding credit. With other words the credit that is still available for a booking and is the first one to expire.
When you intend to change your bookings we advise you for an optimal use to first cancel your booking(s) before making a new booking. In this way, you automatically utilise the credit in your balance with the shortest remaining validity.