...do you sign up for back-to-back programs?

For instance, at my YMCA, you sign up for an 8 week program for $66 and try to get into the time slot you want - if you want to continue after that, you have to sign up for another 8 weeks for another $66 and hope you signed up early enough to get in the same slot.

I'm curious if people do swim classes all year round, or only for winter months, or do one session on and one session off, etc.