I joined Curves about a month ago because my old gym was just far enough away that I didn't always feel like heaving my butt off the sofa and going.  The Curves is only a mile and a half, which I love!
I really enjoy the circuit and the other ladies there.  The best part is that I don't have to think about anything thanks to that voice that tells you to change stations!
Also, I find that since the activity is in short bursts, I tend to go full out on each station.  I figure, I can stand just about anything for 30 seconds!
 PS  Carolyn, congratulations on your weight loss!  That is so fantastic!!!