Thanks for the encouragement and the resources! I looked up that thread, MrsJim, and it was informative. But, I can't imagine what kind of Curves it was that those women were going to where they got no explanation and were allowed to use the machines incorrectly. At my Curves everything is explained very well, including body fat percentage, muscle groups being worked, and so on. Also, my Curves has 13 machines, not 8, and all the machines work opposing muscle groups--for example, the biceps machine also works the triceps--so it's not quite like Meg was saying.
I like the workout at Curves because I was doing nothing for the last 6 months, exercise wise, and needed something I could get through in 30 minutes 3 times a week without fail. And yes, paying for it is definitely an incentive!

I used to belong to a gym, but I couldn't seem to get there often enough, and I had to wait for machines all the time. Also, I hated having to change clothes. So after awhile, it was too easy not to do it.
The only thing I don't like about my Curves is that the women never seem to shut up.

I go there for a workout, not to join the Chatty Cathy club.
I'll keep at it--thanks, byugrad, for helping me to see that there is progress. I think it must be time to alter my eating habits and add additional exercise "beyond Curves."
Jay