We regularly have offers linked to the launch of a new center. The center launch offer would give you access to try cult for a month and then to extend this to another three months for the cost of just one months. So you would get a total of 4 month of membership. During the one month launch offer, you would only be able to book sessions at the same center only and the start date of the pack would be the day the center launches.
You can try classes for a month and you do not have to continue if you do not wish to by paying for the remaining three months. But if you do want to continue, you would need to renew within the 30 day period.