Sign-up is a little odd - to get past online proxy you have to actually enter a name and address (unverified, I think) and then click on terms. But otherwise it's free.
This is a terrific place to workout, and they also do physical therapy, etc. Oddly, they have free public Wifi which works even out in the parking lot. The initial "click to accept the terms" redirect is gimpy - you literally have to accept it several times, but just be patient, keep clicking, ...