If you want to enable the Waitlist functionality for your gym work through the following steps.
Navigate to the Configuration tab.
Select Class and Session Settings, then Select Enable Waitlist.
Click the slider to enable the Waitlist. The slider background will appear blue once enabled.
Enter a Waitlist time limit. This is the time before a class that the waitlist expires i.e. after this time if a Member was to cancel their spot in the class those on the Waitlist would not be added. The time limit can be set to 0 if you wish for the Waitlist to remain active, however it would be unlikely someone on the Waitlist could make it to the class given only say 5 mins to get there.
Select Save and then Exit.