To Gym or not to Gym?

My office's new location is right across the street from a big big big gym. Membership there is not expensive, especially compared to the gym membership that I had during law school in Chicago. At the time, I paid about $80 a month for a membership. It was nice, but basic. Cardio equipment, weights, a few group classes, pilates and a locker room. The one across the street from my office (with a location about a 3 minute drive from my apartment) is $31 per month and a 25 month commitment, which can be broken if I lose my job or move away from Vegas. It's cheaper without childcare, but if I can't have childcare, then I'll just work out at our terrible apartment complex gym for free.

I had thought about joining last summer, but just ruled it out as something that I might not take full advantage of. This time, I feel that since I've actually been working out regularly with DVDs and Netflix at home, that I am physically ready to take advantage of a gym. This gym is nice, too. It's got indoor pools, sauna, steam rooms, lots and lots of cardio and weight machines, lots and lots of group classes at all times of the day, racketball courts (not that I would use them - I play tennis and squash) and a running track. The membership gives you access to six locations throughout the valley, so even if we were to move (please, I want to move!) we'd likely still be close to a location.

I kind of want to do it. $31 a month really isn't much, I just hate committing to paying for something for that long. Should I join? What do you think?